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Review

Changing Epidemiology of Respiratory Tract Infection during COVID-19 Pandemic

by
Hung-Jen Tang
1,
Chih-Cheng Lai
2 and
Chien-Ming Chao
3,*
1
Department of Medicine, Chi Mei Medical Center, Tainan 71004, Taiwan
2
Department of Internal Medicine, Kaohsiung Veterans General Hospital, Tainan Branch, Tainan 710, Taiwan
3
Department of Intensive Care Medicine, Chi Mei Medical Center, Liouying, Tainan 73657, Taiwan
*
Author to whom correspondence should be addressed.
Antibiotics 2022, 11(3), 315; https://doi.org/10.3390/antibiotics11030315
Submission received: 6 February 2022 / Revised: 24 February 2022 / Accepted: 24 February 2022 / Published: 25 February 2022
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Abstract

:
The outbreak of COVID-19 has significantly changed the epidemiology of respiratory tract infection in several ways. The implementation of non-pharmaceutical interventions (NPIs) including universal masking, hand hygiene, and social distancing not only resulted in a decline in reported SARS-CoV-2 cases but also contributed to the decline in the non-COVID-19 respiratory tract infection-related hospital utilization. Moreover, it also led to the decreased incidence of previous commonly encountered respiratory pathogens, such as influenza and Streptococcus pneumoniae. Although antimicrobial agents are essential for treating patients with COVID-19 co-infection, the prescribing of antibiotics was significantly higher than the estimated prevalence of bacterial co-infection, which indicated the overuse of antibiotics or unnecessary antibiotic use during the COVID-19 pandemic. Furthermore, inappropriate antimicrobial exposure may drive the selection of drug-resistant microorganisms, and the disruption of infection control in COVID-19 setting measures may result in the spread of multidrug-resistant organisms (MDROs). In conclusion, NPIs could be effective in preventing respiratory tract infection and changing the microbiologic distribution of respiratory pathogens; however, we should continue with epidemiological surveillance to establish updated information, antimicrobial stewardship programs for appropriate use of antibiotic, and infection control prevention interventions to prevent the spread of MDROs during the COVID-19 pandemic.

1. Introduction

Although it has been more than 2 years since the first outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in Wuhan, China, the negative impact of coronavirus disease 2019 (COVID-19) on global health is continuing [1]. To date, more than 376 million people have been infected and 5 million have died in the whole world [2]. However, effective antiviral agents against SARS-CoV-2 remain limited [3]. In addition to pharmaceutical agents and vaccines against COVID-19, many stringent non-pharmaceutical interventions (NPIs), such as universal masking, hand hygiene, social distancing, the isolation of patients with COVID-19, contact tracing, lockdown, travel restrictions, and cancelation of mass gatherings, have been developed and implemented worldwide to prevent SARS-CoV-2 transmission and contain the COVID-19 outbreak [4,5]. Despite the implementation of the abovementioned NPIs not being able to completely stop the spread of COVID-19, these measures did result in a significant reduction in the prevalence of many other infectious diseases, particularly respiratory tract infections [6,7,8,9,10,11].
Before the emergence of COVID-19, pneumonia, including community-acquired pneumonia (CAP) and hospital-acquired pneumonia (HAP)/ventilation-associated pneumonia (VAP), was one of the most common infectious diseases, and could cause major health problems, associated with high morbidity and mortality in all age groups worldwide [12]. According to the estimation of the Global Burden of Diseases (GBD) study in 2016, 336.5 million cases of lower respiratory tract infections (LRTIs) developed. The estimated incidence was 32.2 per 100,000 people worldwide and these cases caused more than 2.3 million deaths [13]. In 2019, the incidence of LRTI showed increases—there were 489 million incident cases of LRTI, and 11 million prevalent cases of LRTI [14]. Many kinds of microorganisms, including bacterial, viral, and fungal, have been reported as pathogens of pneumonia; however, the causative microorganisms for CAP and HAP differ substantially. The most common causative pathogens in CAP are Streptococcus pneumoniae, respiratory viruses, Haemophilus influenzae and other atypical bacteria such as Mycoplasma pneumoniae and Legionella pneumophila. In contrast, the most frequent microorganisms in HAP are Staphylococcus aureus (including both methicillin-susceptible S. aureus (MSSA) and methicillin-resistant S. aureus (MRSA)), Enterobacterales, Pseudomonas aeruginosa, and Acinetobacter spp. [15,16,17]. However, most of this knowledge was based on studies prior to the COVID-19 pandemic and the emergence of SARS-CoV-2 could significantly change the whole picture of respiratory tract infections in many ways, including epidemiology, microbiological distribution, antibiotic consumption, and antimicrobial resistance. Therefore, we conducted this review to provide an update and comprehensive information about respiratory tract infections during the COVID-19 pandemic.

2. Epidemiology

The implementation of NPIs to control COVID-19 had indirectly and largely reduced hospital utilization due to CAP. In Japan, a study based on claims data from the Quality Indicator/Improvement Project database in 262 hospitals reported that the number of hospitalizations for CAP during the period between March and July 2020 drastically decreased by 48.1% compared with the same period in 2019 [18]. In addition, milder cases showed a greater decrease in the year-over-year ratio than severe ones: mild −55.2%, moderate −45.8%, severe −39.4%, and extremely severe −33.2% [18]. In Hong Kong, all-cause pneumonia hospitalization during the COVID-19 pandemic significantly decreased by 17.5% (95% CI 16.8% to 18.2%, p < 0.0005) [19]. In Taiwan, a retrospective national epidemiological surveillance study using the electronic database of the Taiwan National Infectious Disease Statistics System also demonstrated a significant decrease in cases of all-cause pneumonia during the COVID-19 pandemic [20]. For elderly patients, a population-based study in Italy using Tuscany healthcare system data showed that compared with the average of the corresponding periods in 2017–2019, significant reductions of 31.5% in weekly hospitalization rates for CAP were observed from the week in which the national containment measures were imposed (week 10) until the end of the first COVID-19 wave in July 2020 (week 27) [21]. However, the rates of ICU admission and in-hospital mortality were significantly higher among these elderly patients with CAP during the pandemic than the previous period [21]. Children were similarly affected due to COVID. In Brazil, one study based on the Department of Informatics of the Brazilian Public Health System database showed that there was a significant reduction of 82% in the average incidence of hospitalizations due to pneumonia for children ≤14 years (897.4/100,000 during pre-pandemic vs. 162.1/100.000 during pandemic, incidence rate ratio = 0.18; 95% CI, 0.15–0.21) [22]. In Poland, Grochowska et al. noted an 81% decline in LRTI-associated hospital admissions among pediatric patients using ICD-10 analysis (from a mean of 1170 admissions per year in the previous four years to 225 admissions between April 2020 through March 2021) [23]. A similar finding was observed for acute bronchiolitis among infants in Brazil—a significant reduction of more than 70% of hospitalizations was observed after the introduction of social distancing due to the COVID-19 pandemic [24]. Regarding emergency department (ED) utilization, a quasi-experimental interrupted time series analysis based on a French prospective surveillance system of six pediatric emergency departments demonstrated that significant decreases in ED visits (−79.7%, 95% CI, −84.3 to −73.8%; p < 0.0001), and hospital admissions (−71.3%, 95% CI, −78.8 to −61.1%; p < 0.0001) were observed for children with CAP [25]. A retrospective analysis of 29 acute care hospitals, covering 98% of ED beds in Israel found the same: that there was a decrease of 33% of ED visits for pneumonia and this reduction was consistently observed across all age groups [26]. All the above findings confirmed the decline in hospitalization utilization due to pneumonia and the major cause could be due to the indirect effect of NPI for the containment of COVID-19. However, the introduction of additional virtual services, and avoidance of exposure to the ED or hospital environment, could also result in a reduction in ED visits and hospitalization. In addition to respiratory tract infection, many other infections could be reduced in this pandemic. In Taiwan, where COVID-19 was well-controlled by aggressive infection prevention measures, 14 airborne/droplet, 11 fecal–oral, 7 vector-borne, and 4 direct contact transmitted notifiable infectious diseases had significant reductions of 2700 (−28.1%), 156 (−23.0%), 557 (−54.8%), and 73 (−45.9%) cases, respectively [27]. The similar findings were observed in Japan [28], China [29], Germany [30] and Australia [31]. Overall, these findings suggest that these NPI measurements such as masking, hand hygiene and social distancing during peaks of respiratory infections could be implemented in the future to help reduce respiratory morbidity and mortality.

3. Viral Respiratory Tract Infection

Since the outbreak of COVID-19, the distribution of causative pathogens in patients with respiratory tract infection has drastically changed. The virological distribution of respiratory virus underwent a huge shift due to SARS-CoV-2 becoming the most predominant virus causing LRTIs. In Germany, a study based on the prospective, multinational, multicenter cohort using molecular methods for the detection of the most common viral pathogens found that the most common pathogen was SARS-CoV-2 (96/435, 22%), followed by rhinovirus (24/435, 5.5%) and influenza virus (9/435, 2%) in 2020 [32]. This microbiological distribution is significantly different from those in 2018 and 2019, in which rhinovirus and influenza virus were the two most common pathogens [32]. Among pediatric patients with CAP in Shanghai, China, the detection rate of the eight common respiratory viruses including respiratory syncytial virus, influenza virus A and B, parainfluenza virus 1–3, adenovirus and human metapneumovirus from 2011 to 2019 ranged from 16.9% to 26.9%, but dramatically declined to 10.5% in 2020 [33]. The declining trend of respiratory virus, including influenza, parainfluenza virus, adenovirus, common cold coronavirus, human metapneumovirus, rhinovirus, and respiratory syncytial virus infection was consistently observed in another study in Texas, USA [34]. According to microbiological analysis among pediatric infections in Poland, there were 100% and 99% drops in influenza virus and respiratory syncytial virus, respectively, during the pandemic season until April 2021 in comparison to pre-pandemic years [23]. Finally, the significant decreases in seasonal influenza activity during COVID-19 have been observed in many countries, including the United States [35], Japan [6], England [36], Australia [35], Canada [37], South Africa [35], Singapore [38], Taiwan [39], South Korea [40], and Chile [35]. Overall, the viral distribution of respiratory tract infection has been largely shifted to the predominance of SARS-CoV-2, and the introduction of NPIs for COVID-19 could additionally help control the transmission of other SARS-CoV-2 respiratory viruses. Although previous studies have speculated the potential for both positive and negative interaction via an interferon-mediated mechanism between respiratory viruses [41,42], it remains unclear whether there is also the potential impact of viral–viral interactions between SARS-CoV-2 and other respiratory viruses on these declines.

4. Bacterial Pneumonia

Many studies demonstrated the change in incidence of bacterial pneumonia during the COVID-19 pandemic [19,43,44,45,46,47,48,49]. Although S. pneumoniae is the most common pathogen of CAP, the incidence of invasive pneumococcal disease (IPD) was significantly decreased in many countries during this pandemic [19,43,44,45,46,50,51,52]. In England, a prospective national cohort study revealed that the incidence of IPD in 2019/2020 was significantly lower than those in 2018/2019 (7.6/100,000 vs. 10.9/100,000; incidence rate ratio, 0.70; 95% CI, 0.18–2.67) [45]. In Hong Kong, the incidence of pneumococcal pneumonia and IPD in adult patients both significantly decreased by 82% and 89% (incidence rate ratios, 0.28 [95% CI, 0.23–0.33] and 0.11 [95% CI, 0.07–0.18]), respectively [19]. A similar trend was observed for elderly patients aged ≥65 years, in which there were reductions of 73% and 93% for pneumococcal pneumonia and IPD, respectively [19]. For children, a prospective cohort study in Israel showed that community-acquired alveolar pneumonia and bacteremic pneumococcal pneumonia were largely reduced by 93% and 81% (incidence rate ratios, 0.07 and 0.19, respectively) [43]. In the meanwhile, non-alveolar lower respiratory infections and non-pneumonia IPD were reduced, but the magnitude of reduction was only 54% and 58% (incidence rate ratios, 0.46 and 0.42, respectively) [43]. In South Korea, the incidence rate of IPD in children in 2020 decreased by 57%, compared with 2018 to 2019 (26.6 per 100,000 inpatients vs. 11.5 per 100,000 inpatients, p = 0.014) [44]. Moreover, a prospective analysis of surveillance data, laboratories in 26 countries and territories across 6 continents showed that all countries and territories had experienced a significant and sustained reduction in IPD in early 2020 (1 January to 31 May 2020) following the introduction of COVID-19 containment measures in each country [46]. In addition to S. pneumoniae, several studies also reported a decline in H. influenzae and Mycoplasma pneumoniae infection during COVID-19 pandemic [46,47,48]. However, several studies found that the increased presence of Legionella in the environment could be due to extreme stagnation in building water systems that resulted from prolonged building closures [53,54,55]. It may further increase the exposure risks to Legionella from building water systems during re-opening of previously closed buildings. Clinically, one study based on the Taiwan National Notifiable Disease Surveillance System found that compared with the pre-pandemic period, the rate of Legionnaires’ disease during the COVID-19 pandemic was increasing [49]. In summary, these findings urge us to establish an updated epidemiology of community-acquired bacterial pneumonia during the COVID-19 pandemic.

5. Tuberculosis (TB)

In addition to virus and bacteria, the outbreak of COVID-19 made a significant impact on the prevention, control and management of TB, particularly in developing countries [56]. The Global Tuberculosis Network collected data from 33 centers in 16 countries on 5 continents and showed that TB-related hospital discharges, newly diagnosed cases of active TB, total active TB outpatient visits, and new latent TB infection (LTBI) and LTBI outpatient visits were lower during the first 4 months of the pandemic in 2020 than for the corresponding period in 2019 [57]. Their findings [57] and many other studies [58,59,60,61,62,63,64,65] consistently indicated that COVID-19 has negatively impacted TB diagnosis, care, and prevention services globally. In contrast, the implementation of NPIs against SARS-CoV-2 outbreaks could potentially prevent the transmission of Mycobacterium tuberculosis (MTB). Like other respiratory pathogens, several studies reported that a reduction in respiratory contacts due to the widespread use of masks and social distancing may help reduce spread of MTB [27,66,67,68]. In summary, although the numbers of TB patients have declined globally during COVID-19 pandemic, the causes could be multifactorial, including the disruption of TB services and the prevention effects of NPIs. Further study is warranted to determine the key causes for TB declines. In the meantime, we should keep working on the restoration of TB diagnosis and care services for minimizing potentially negative effects on TB-related deaths.

6. Hospital-Acquired Pneumonia

Despite the fact that many NPIs were introduced into the healthcare system for the prevent and control of SARS-CoV-2, it was possible that the conventional infection prevention resources were shifted to focus on the COVID-19 response, particularly within the overwhelmed hospitals by the surging COVID-19 hospitalization [69]. The relaxed traditional infection control and prevention measures may change the epidemiology of healthcare-associated infections (HAIs), including HAP. One retrospective cohort study of mechanically ventilated adults at four academic and community hospitals in Massachusetts showed that ventilator-associated events (VAEs) per 100 episodes of mechanical ventilation were more common in 2020 than in prior years (11.2 vs. 6.7; p < 0.01). Although the rate of VAEs per 1000 ventilator days was also higher in 2020 than in previous years (14.2 vs. 12.7), the difference did not reach statistical significance (p = 0.08) [70]. Furthermore, another large US study based on the National Healthcare Safety Network demonstrated significant increases in the national standardized infection ratios for central-line-associated bloodstream infections (CLABSIs), catheter-associated urinary tract infections (CAUTIs), VAEs and MRSA bacteremia in 2020 [71]. In addition, the significant increases in the incidence of VAE were consistently observed across all four quarters of 2020 [71]. The condition could be worse for the patients with COVID-19. A study of 744 critically ill patients with COVID-19 reported that 759 episodes of HAIs developed in 359 patients, and VAP was the most common type of HAI (50%, n = 389) [72]. One survey showed that VAEs were more common in patients with COVID-19 than in patients without COVID-19 in 2020 (29.0 per 100 ventilator episodes vs. 7.1 per 100 ventilator episodes (p < 0.01) and 17.2 per 1000 ventilator days vs. 12.2 per 1000 ventilator days (p < 0.01)) [70]. Compared with inpatients without positive SARS-CoV-2, COVID-19 patients had significantly higher rates of infection-related ventilator-associated complications and probable VAP, with adjusted ORs of 4.7 (95% CI, 1.7–13.9) and 10.4 (95% CI, 2.1–52.1), respectively [73]. Among critical COVID-19 patients with VAP, Gram-negative bacteria and Staphylococcus aureus caused 64% and 28% of cases, respectively [72]. Overall, the updated meta-analysis of 34 studies involved 8901 cases, in which VAP was reported in 48.15% (95% CI, 42.3–54%) mechanically ventilated COVID-19 patients and the risk of VAP was higher in COVID-19 patients than other non-SARS-CoV-2 viral pneumonia (OR, 2.33; 95% CI, 1.75–3.11; I2 = 15%) [74]. All the above findings indicated the incidence of HAIs, including HAP, would increase during the COVID-19 pandemic and the risk of VAP could be higher in patients with critical COVID-19 than those with other non-COVID-19 pneumonia.

7. COVID-19 Co-Infection

In addition to non-COVID-19 pneumonia, clinicians should also be concerned about the possibility of COVID-19 co-infection. Many microorganisms, including bacteria, virus, fungi, and MTB, can cause co- or secondary infection with SARS-CoV-2 (Table 1) [75,76,77,78,79,80,81,82]. Based on the findings of a systemic review and meta-analysis including 64 studies with 61,547 patients, the estimated prevalence of co-infection was 16.98% (95% CI: 13.62–20.62%) [83]. The most common causative agents of co-infection among COVID-19 patients were bacteria (pooled prevalence: 20.97%; 95% CI: 15.95–26.46%), followed by virus (pooled prevalence: 12.58%; 95% CI: 7.31–18.96%) and fungus co-infections (pooled prevalence: 12.60%; 95% CI: 7.84–17.36%) [83]. Another meta-analysis including 118 articles demonstrated the similar findings—the pooled prevalence of co-infection was 19% (95% CI: 14–25%) [78]. However, they have different findings about the microbiologic distribution of COVID-19 co-infection—viral co-infection had the highest prevalence (the pooled prevalence: 10%; 95% CI: 6–14%), followed by bacteria (8%; 95% CI: 5–11%) and fungi (4%; 95% CI: 2–7%) [78].
Regarding specific pathogens, K. pneumoniae was the most common bacteria (9.9%), followed by S. pneumoniae (8.2%), S. aureus (7.7%), H. influenza (6.6%), and M. pneumoniae (3.8%) [78]. Among these bacteria, the role of MRSA lung infection in patients with COVID-19 cannot be neglected. There was significant heterogeneity in the retrieved literature on the epidemiology of MRSA pulmonary infection in patients with COVID-19. The relative prevalence ranged from 2% to 29% when considering all other bacteria as the denominator and the prevalence could increase to 11% to 65% when considering only S. aureus [84].
Among respiratory virus co-infection among patients with COVID-19, influenza A was the most common virus (22.3%), followed by influenza B (3.8%), respiratory syncytial virus (3.8%), rhinovirus (3.6%) and non-SARS-CoV-2 coronavirus (2.0%) [78]. One meta-analysis included 12 studies involving 9498 patients to investigate the impact of SARS-CoV-2 and influenza co-infection on disease outcomes and found that co-infection with influenza was not significantly associated with mortality (OR, 0.85; 95% CI: 0.51–1.43; p = 0.55, I2 = 76%) [85]. However, this result should be interpreted with caution due to its high heterogeneity, and a subgroup analysis with low heterogeneity found that mortality could significantly increase in studies outside of China (OR, 1.56; 95% CI: 1.12–2.19; I2 = 1%) [85].
Many fungi, including Aspergillus, Candida species, Cryptococcus neoformans, and fungi of the Mucorales order can cause co-infection with COVID-19 [82]. However, clinicians should be seriously concerned about two clinical entities—COVID-19 associated pulmonary aspergillosis (CAPA) and COVID-19 associated mucormycosis (CAM), which are aggressive fungal diseases with high morbidity and mortality [75,77]. One review reported that the incidence of CAPA ranged from 19.6% to 33.3% and the overall mortality was high, which could be up to 64.7% (n = 22) in the pooled analysis of 34 reported cases [77]. The use of corticosteroid and interleukin-6 blockade could be the significant risk factor of patients with CAPA [77]. The pooled prevalence of CAM was 7 cases per 1000 patients, which was 50 times higher than the highest recorded background of mucormycosis (0.14 cases per 1000 patients) [86]. Poor control of diabetes mellitus, such as diabetes ketoacidosis, is the most common risk factor of patients with CAM, and the mortality of patients with CAM was high with a pooled prevalence rate of 29.6% (95% CI, 17.2–45.9%) [86]. However, the diagnosis of both CAPA and CAM is not easy to make. It requires high index of suspicion and regular screening for risk factors and clinical features of them. Moreover, their treatment is complicated, which consists of controlling the underlying diseases (diabetes mellitus), withdrawal of immunomodulators, early antifungal therapy and extensive surgical debridement if needed [75,77].
However, the prevalence of co-infection among COVID-19 patients can vary according to the disease severity of SARS-CoV-2 infection, and diagnostic methods [76,83,87,88,89,90]. First, the prevalence of co-infection would increase with the disease severity of COVID-19. Severe/critical COVID-19 at presentation could be significantly and independently associated with the rate of co-infection association (adjusted OR, 4.42; 95% CI, 1.63–11.9) [91]. Second, the different diagnostic modality would have different detection rate of co-infections. One study compared the BioFire® FilmArray® Pneumonia Panel and conventional culture-based method to detect bacterial co-infection and found that the panel incidence of detections was 33% (95% CI, 0.25–0.41%, I2 = 32%), which was higher than the culture method of 18% (95% CI, 0.02–0.45%; I2 = 93%) [88]. Moreover, the molecular test could not only increase the rates of microbial detection but also significantly reduced the turn-around-time. Most importantly, there is robust evidence indicating that patients with co-infection would have worse outcomes, including longer length of hospital stays and higher risk of death, than those without co-infection [78,79,86,92,93]. Overall, this suggests that clinicians should keep alert to the possibility of co-infection among patients with COVID-19 and, further, make early diagnoses and apply appropriate antimicrobial treatment for this clinical entity.

8. Antibiotic Utilization and Resistance

Overuse of antibiotic for patients with SARS-CoV-2 infections during the first wave of COVID-19 due to the relaxed antimicrobial stewardship policies is common. One systemic review focusing on COVID-19 patients admitted to the ICU found that 71% (1929/2715) of them received antibiotics during their ICU stay [94]. Another meta-analysis involving 24 studies with 3338 patients with COVID-19 showed that 71.9% (95% CI 56.1–87.7%) of them received antibiotics but the overall proportion of COVID-19 patients with bacterial infection was 6.9% (95% CI 4.3–9.5%) [87]. Similar findings were reported in another meta-analysis including 154 studies—the prevalence of antibiotic prescribing was 74.6% (95% CI, 68.3–80.0%), which increased with patient age (OR, 1.45 per 10 year increase, 95% CI 1.18–1.77%) and the proportion of patients requiring mechanical ventilation (OR, 1.33 per 10% increase, 95% CI 1.15–1.54) [95]. In contrast, the estimated bacterial co-infection based on an analysis of 31 studies was only 8.6% (95% CI 4.7–15.2%) in this meta-analysis [95]. All these findings indicated that the prescribing is significantly higher than the estimated prevalence of bacterial co-infection and unnecessary antibiotic use could be high in patients with COVID-19.
In addition to the increasing use or overuse of antibiotics, we should seriously be concerned about another urgent threat to public health—the further development of antimicrobial resistance following inappropriate antibiotic use during the COVID-19 pandemic [96]. The association between the increasing use of antibiotics and antibiotic resistance has been demonstrated in several institutions [97,98]. A retrospective analysis in an intensive care unit in India showed that up to a 40% increase in antimicrobial resistance was observed amongst these isolated bacteria obtained during the COVID-19 period compared to pre-COVID-19 times [98]. A retrospective observational study in Brazil showed that the overall infection density of multidrug-resistant (MDR) organism infections significantly increased by 23% (p < 0.005) during COVID-19 [99] and the significant increases were observed for carbapenem-resistant Acinetobacter baumannii (CRAB) and MRSA in both ICU and non-ICU settings [99]. Furthermore, one study in an academic hospital reported that the acquisition of MDR Gram-negative bacteria would increase 3% for every increase in positive COVID-19 tests per week [100]. In the meantime, a significant spread of resistant pathogens, such as CRAB, carbapenem-resistant P. aeruginosa, carbapenem-resistant Enterobacterales, extended-spectrum β-lactamase-producing K. pneumoniae, MDR E. coli and vancomycin-resistant Enterococcus could develop among critically ill COVID-19 patients in the ICU [101,102,103,104,105,106,107]. In addition to antibiotic-resistant bacteria, MDR Candida auris should be monitored closely during this pandemic [108]. The cause of the increasing antimicrobial resistance could be multifactorial, including high antimicrobial exposure, environmental contamination, and disruption of infection control practice [105,109]. All these indicate that antibiotic stewardship programs remain essential to prevent unnecessary and inappropriate antibiotic use in hospitalized patients with COVID-19 and infection control interventions remain crucial to prevent the spread of MDR organisms.

9. Conclusions

The outbreak of COVID-19 could exhibit both a positive impact due to the implementation of NPIs and a negative effect due to the disruption of healthcare systems at all levels (Figure 1). First, the implementation of NPIs for the containment of this outbreak also provides some additional benefit for global health. NPIs including universal masking, hand hygiene, and social distancing not only resulted in the decline in reported SARS-CoV-2 cases but also contributed to the decline in non-COVID-19 respiratory tract infection-related hospital utilization. Moreover, it led to the decreased incidence of previous commonly encountered respiratory pathogens, such as influenza and S. pneumoniae. However, the decline in TB could be attributed to the positive effect of NPIs and the negative impact of reduced TB service. Overall, our findings suggest that NPIs could be effective in preventing respiratory tract infection and changing the microbiologic distribution of respiratory pathogens. However, in this era of COVID-19, which is still evolving, we should keep conducting continuous epidemiological surveillance to monitor the trend of respiratory tract infection and further provide immediate information for making strategies to combat these infections.
Second, how to manage severe COVID-19 and its associated co-infection in acute and intensive care settings remains a great challenge. Although antimicrobial agents are an important treatment for patients with COVID-19 co-infection, many studies demonstrated that the prescribing of antibiotics was significantly higher than the estimated prevalence of bacterial co-infection and indicated the overuse of antibiotic or unnecessary antibiotic use during the COVID-19 pandemic. Moreover, inappropriate antimicrobial exposure may drive the selection of drug-resistant microorganisms and the disruption of infection control may result in the spread of drug-resistant pathogens. The threat of antimicrobial resistance will continue to pose a substantial impact on the healthcare systems. To mitigate the possible long-term impact of COVID-19 on antimicrobial resistance, it is necessary to integrate antimicrobial stewardship activities in the pandemic response to COVID-19 and develop novel approaches to stewardship according to COVID-19 settings and local epidemiology. In the meantime, close adherence to infection prevention and control measures is urgently needed.

10. Future Directions

Although COVID-19 drastically changed the whole world, the process of this fight against SARS-CoV-2 also taught us that we can do far more to prevent respiratory tract infection and its associated hospital utilization. At the same time, we should continue epidemiological surveillance, antimicrobial stewardship programs and infection control prevention interventions during this pandemic.

Author Contributions

Conceptualization, H.-J.T. and C.-C.L.; data curation, H.-J.T. and C.-M.C.; writing—original draft preparation, C.-C.L.; writing—review and editing, H.-J.T. and C.-M.C. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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Antibiotics 11 00315 g001 550
Figure 1. The impact of COVID-19 on the epidemiology of respiratory tract infection.
Figure 1. The impact of COVID-19 on the epidemiology of respiratory tract infection.
Antibiotics 11 00315 g001
Table
Table 1. Microorganism can cause COVID-19 co-infection.
Table 1. Microorganism can cause COVID-19 co-infection.
MicroorganismPathogens
BacteriaStreptococcus pneumoniae, Staphylococcus aureus, Klebsiella pneumoniae, Mycoplasma pneumoniae, Chlamydophila pneumoniae, Legionella pneumophila, Escherichia coli, Stenotrophomonas maltophilia, Bordetella, Moraxella catarrhalis, Pseudomonas spp., Acinetobacter spp. and Enterococcus spp.
Virusnon-SARS-CoV-2 coronavirus, influenza, respiratory syncytial virus, parainfluenza, rhinovirus, adenovirus and human immunodeficiency virus
FungusCandida spp., Aspergillus spp., Rhizopus oryzae, Rhizopus microsporus, Rhizopus azygosporus, Lichtheimia mucor, Lichtheimia ramose, and Cryptococcus neoformans
MycobacteriumMycobacterium tuberculosis
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Tang, H.-J.; Lai, C.-C.; Chao, C.-M. Changing Epidemiology of Respiratory Tract Infection during COVID-19 Pandemic. Antibiotics 2022, 11, 315. https://doi.org/10.3390/antibiotics11030315

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Tang H-J, Lai C-C, Chao C-M. Changing Epidemiology of Respiratory Tract Infection during COVID-19 Pandemic. Antibiotics. 2022; 11(3):315. https://doi.org/10.3390/antibiotics11030315

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Tang, Hung-Jen, Chih-Cheng Lai, and Chien-Ming Chao. 2022. "Changing Epidemiology of Respiratory Tract Infection during COVID-19 Pandemic" Antibiotics 11, no. 3: 315. https://doi.org/10.3390/antibiotics11030315

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