COVID-19 Academic Resources Center
 

MDPI Comment on the COVID-19 Virus

Since 1996, MDPI has been committed to supporting the research community by providing the latest research freely available and making relevant and useful research available as quickly as possible. The world is current experiencing a pandemic of COVID-19, and researchers are working extremely hard to understand it and find a cure.

The values MDPI holds strongly are particularly important at the moment, and we will continue to publish relevant, peer-reviewed research as quickly as possible in open access format. This means that it will immediately be available for researchers, health professionals, and the general public to read, distribute, and reuse. We believe that scientific advancements will be crucial to overcoming this pandemic, and will do everything we can to support researchers working looking for solutions.

This page contains a variety of information related to COVID-19 available from MDPI, including journal articles, special issues, and preprints, among others.

Recent Publications

22 pages, 2983 KB  
Article
Implementation of SARS-CoV-2 Wastewater Surveillance Systems in Germany—Pilot Study in the Federal State of Thuringia
by Felix Kaller, Gloria M. Kohlhepp, Sarah Haeusser, Sara Wullenkord, Katarina Reichel-Kühl, Anna Pfannstiel, Robert Möller, Jennifer Führ, Carlos Chillon Geck, Yousuf Al-Hakim, Andrea Lück, Norbert Kreuzinger, Johannes Pinnekamp, Mathias W. Pletz, Claudia Klümper, Silvio Beier and Kay Smarsly
Microorganisms 2026, 14(2), 277; https://doi.org/10.3390/microorganisms14020277 (registering DOI) - 24 Jan 2026
Abstract
Since the COVID-19 pandemic, wastewater monitoring has become an additional tool in the surveillance of infectious diseases. Many EU countries put wastewater surveillance systems (WSS) in place to track SARS-CoV-2 and its variants and other pathogens, such as the influenza virus or Respiratory [...] Read more.
Since the COVID-19 pandemic, wastewater monitoring has become an additional tool in the surveillance of infectious diseases. Many EU countries put wastewater surveillance systems (WSS) in place to track SARS-CoV-2 and its variants and other pathogens, such as the influenza virus or Respiratory syncytial virus (RSV). In Germany, several research and pilot projects funded by the EU, the Federal Ministry of Education and Research, the Federal Ministry of Health, and projects at Federal State level have been launched in the last four years. In Germany, wastewater monitoring was not implemented as a public health tool before the COVID-19 pandemic, but in September 2022, it has been legally determined in the German infection protection act (Infektionsschutzgesetz, IfSG). As Germany is a federal state, competencies in epidemic management partly belong to the 16 federal states (“Länder”). In the federal states, the local health authorities at the county (“Kreise”) level also have specific risk management and communication competencies. Furthermore, WSS has been incorporated into the revised Urban Wastewater Treatment Directive (EU) 2024/3019. For this reason, the federal states and local health authorities play a pivotal role in successfully implementing wastewater monitoring as a supplementary component of disease surveillance in Germany. Between November 2021 and August 2022, the federal state of Thuringia, Germany, supported a pilot study to implement a surveillance system for SARS-CoV-2-RNA in wastewater of 23 wastewater treatment plants in 17 counties in Thuringia. Here, we describe the study design and the system behind the logistics and the planning, and we provide an overview of the options for involving the public health service. Furthermore, the possibilities for IT concepts and approaches to innovative AI solutions are shown. We also aim to explore the feasibility and potential barriers to further implementing wastewater surveillance as a supplementary public health tool in Thuringia. Full article
(This article belongs to the Special Issue Surveillance of Health-Relevant Pathogens Employing Wastewater)
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11 pages, 253 KB  
Review
Real-World Cardiovascular Research Using the German IQVIA Disease Analyzer Database: Methods, Evidence, and Limitations (2000–2025)
by Karel Kostev, Marcel Konrad and Mark Luedde
J. Cardiovasc. Dev. Dis. 2026, 13(2), 61; https://doi.org/10.3390/jcdd13020061 (registering DOI) - 24 Jan 2026
Abstract
Cardiovascular diseases (CVDs) remain the leading cause of morbidity and mortality worldwide. This increases the demand for real-world evidence to complement findings from randomized controlled trials. The German IQVIA Disease Analyzer (DA) database, which is populated with anonymized electronic medical records from general [...] Read more.
Cardiovascular diseases (CVDs) remain the leading cause of morbidity and mortality worldwide. This increases the demand for real-world evidence to complement findings from randomized controlled trials. The German IQVIA Disease Analyzer (DA) database, which is populated with anonymized electronic medical records from general practitioners and specialists, has become an increasingly valuable source for cardiovascular research. Over the past two decades, and especially between 2020 and 2025, numerous epidemiological studies have used this database to explore associations between cardiovascular risk factors, comorbidities, therapeutic patterns, and cardiovascular outcomes in large, broadly representative outpatient populations. This review synthesizes evidence from 13 selected DA-based studies examining atrial fibrillation, heart failure, cardiometabolic disease, lipid management, non-alcoholic fatty liver disease (NAFLD)–related cardiovascular risks, cerebrovascular complications, COVID-19-associated vascular events, and modifiable behavioral and anthropometric factors. These studies were selected based on predefined criteria including cardiovascular relevance, methodological rigor, large sample size, and representativeness of key disease domains across the 2000–2025 period. Eligible studies were identified through targeted searches of peer-reviewed literature using the German IQVIA Disease Analyzer database and were selected to reflect major cardiovascular disease domains, risk factors, and therapeutic areas. Across disease domains, the reviewed studies consistently demonstrate the DA database’s capacity to identify reproducible associations between cardiometabolic risk factors, comorbidities, and cardiovascular outcomes in routine outpatient care. While causal inference is not possible, the database enables the identification of clinically meaningful associations that inform hypothesis generation, help quantify disease burden, and highlight gaps in prevention or treatment. The database’s strengths include large sample sizes (often exceeding 100,000 patients), long follow-up periods, and high external validity, while limitations relate to coding accuracy, residual confounding, and the absence of detailed clinical measures. Collectively, the evidence underscores the importance of the DA database as a crucial platform for real-world cardiovascular research. Full article
(This article belongs to the Section Basic and Translational Cardiovascular Research)
12 pages, 5969 KB  
Article
The Extract of the Endophytic Fungus Penicillium compactum Inhibits the Replication of Human Coronavirus
by Jihun Choi, Siyun Lee, Chunghyeon Lee, Seungju Cho, Woochul Jung, Jayhyun Park, Yeong-Geun Lee, Youngae Jung, Chun-Zhi Jin, Hyung-Gwan Lee, Chang Soo Lee and Junsoo Park
Int. J. Mol. Sci. 2026, 27(3), 1183; https://doi.org/10.3390/ijms27031183 (registering DOI) - 24 Jan 2026
Abstract
Fungal extracts have been reported to exert diverse biological activities, including anti-inflammatory, antibacterial, and antiviral effects. However, the anti-coronaviral properties of fungal extracts remain largely unexplored. In this study, we demonstrated that the Penicillium compactum extract (PCE) inhibits the replication of human coronavirus. [...] Read more.
Fungal extracts have been reported to exert diverse biological activities, including anti-inflammatory, antibacterial, and antiviral effects. However, the anti-coronaviral properties of fungal extracts remain largely unexplored. In this study, we demonstrated that the Penicillium compactum extract (PCE) inhibits the replication of human coronavirus. RD cells were infected with human coronavirus and subsequently treated with PCE. PCE treatment reduced the expression of viral proteins and ameliorated virus-induced cytopathic effects. In addition, PCE markedly decreased viral RNA levels in both the cells and the conditioned medium. Finally, we confirmed that PCE treatment reduced the production of infectious viral particles. Collectively, these findings indicate that PCE exhibits potent antiviral activity against human coronavirus. Full article
(This article belongs to the Special Issue Molecular View of Natural Products with Antiviral Effects)
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22 pages, 1330 KB  
Systematic Review
Effects of Exercise-Based Telerehabilitation for Knee Osteoarthritis: A Systematic Review and a Study Protocol
by Giacomo Farì, Francesco Quarta, Federica Bressi, Raffaele La Russa, Teresa Paolucci and Andrea Bernetti
Bioengineering 2026, 13(2), 136; https://doi.org/10.3390/bioengineering13020136 (registering DOI) - 24 Jan 2026
Abstract
Background: Knee osteoarthritis causes considerable pain and disability. Telerehabilitation has emerged as a promising treatment option, especially after the Coronavirus Disease 2019 pandemic, but it still faces challenges regarding solid scientific evidence about its multiple benefits. This systematic review aimed to analyze the [...] Read more.
Background: Knee osteoarthritis causes considerable pain and disability. Telerehabilitation has emerged as a promising treatment option, especially after the Coronavirus Disease 2019 pandemic, but it still faces challenges regarding solid scientific evidence about its multiple benefits. This systematic review aimed to analyze the reported beneficial effects of telerehabilitation based on therapeutic exercise for the management of knee osteoarthritis. Methodsː PubMed, PEDro, Web of Science and Cochrane Library databases were used to identify eligible studies. This review followed the PRISMA guidelines and was registered at PROSPERO (n° CRD42024579836). The selected studies underwent a qualitative assessment using the Modified Jadad Score. Results: Ten studies, including a total of 1354 participants, were included. From the selected studies, a wide variety of outcome measures emerged to evaluate the efficacy of telerehabilitation in the relief of pain and its clinical consequences. Seven studies specifically assessed pain, with four showing significant improvements in pain reduction in the intervention group compared with the control group. Telerehabilitation was found to be more effective or non-inferior to traditional rehabilitation in relieving pain, as reported across various pain scales. Limitations include the heterogeneity of interventions, the exclusion of non-recent studies, and the exclusive focus on therapeutic exercise. Conclusionsː The results of this systematic review suggest that telerehabilitation provides pain relief, improves physical function, and enhances quality of life, while preliminary evidence indicates potential cost-related advantages. However, some studies did not find TR to be superior to control interventions, highlighting mixed evidence. Additional high-quality studies are required to better support this promising rehabilitation approach. Full article
(This article belongs to the Special Issue IoT Technology in Bioengineering Applications: Second Edition)
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24 pages, 10802 KB  
Article
NRICM102, a TCM Formula, Attenuates COPD-Relevant Inflammatory Lung Injury in Mice by Improving Pulmonary Function and Reversing Immune Dysregulation
by Yuh-Chiang Shen, Kuo-Tong Liou, Yea-Hwey Wang, Geng-You Liao, Wen-Chi Wei, Cher-Chia Chang, Wen-Fei Chiou, Keng-Chang Tsai, Chun-Tang Chiou, Yaw-Dong Lang, Chia-Ching Liaw and Yi-Chang Su
Pharmaceuticals 2026, 19(2), 199; https://doi.org/10.3390/ph19020199 - 23 Jan 2026
Abstract
Background: Chronic obstructive pulmonary disease (COPD) is a progressive inflammatory lung disorder with limited effective therapies. NRICM102, a traditional multi-herbal formulation originally developed for COVID-19, exhibits anti-inflammatory and immunomodulatory potential. Objectives: The aim of this study was to investigate the therapeutic efficacy of [...] Read more.
Background: Chronic obstructive pulmonary disease (COPD) is a progressive inflammatory lung disorder with limited effective therapies. NRICM102, a traditional multi-herbal formulation originally developed for COVID-19, exhibits anti-inflammatory and immunomodulatory potential. Objectives: The aim of this study was to investigate the therapeutic efficacy of NRICM102 in a COPD-relevant inflammatory lung injury mice model. Methods: Mice were exposed to lipopolysaccharide (LPS) and benzo[a]pyrene (B[a]P) to induce chronic airway inflammation and structural lung damage and treated with NRICM102 (1.5–3.0 g/kg) or dexamethasone. Lung function, histopathology, transcriptomic profiling, and protein expression of key inflammatory markers were assessed. Results: NRICM102 significantly restored LPS+B[a]P-induced enhanced pause (Penh) and arterial oxygen saturation (aO2%), similar to the effect of dexamethasone. Histological analysis revealed marked alveolar damage, inflammatory cell infiltration, and fibrosis in the model group, all of which were significantly attenuated by NRICM102 in a dose-dependent manner, with high-dose (3.0 g/kg) treatment showing pronounced structural preservation. Transcriptomic profiling revealed that NRICM102, particularly at 3.0 g/kg, partially reversed COPD-associated gene expression patterns, characterized by reduced activation of cytokine signaling, chemokine activity, and antigen presentation pathways. GO, DO, and KEGG enrichment analyses indicated selective modulation of immune-related pathways, with high-dose NRICM102 affecting genes involved in adaptive immunity and cytokine receptor interactions, including a subset of 150 reverted genes. Immunofluorescence analysis confirmed dose-dependent reductions in key inflammatory, immune, and mucus-related markers, including IL-1β, NLRP3, Muc5ac, and MMP12 expression. Conclusions: NRICM102 confers significant protective effects against COPD-relevant inflammatory lung injury by improving pulmonary function, preserving lung architecture, and selectively modulating immune and inflammatory pathways. These results provide preclinical evidence supporting the potential of NRICM102 to modulate inflammation and immune responses associated with COPD-related pathology, although further studies are needed to establish its therapeutic relevance. Full article
(This article belongs to the Section Natural Products)
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10 pages, 863 KB  
Article
Destruction/Inactivation of SARS-CoV-2 Virus Using Ultrasound Excitation: A Preliminary Study
by Almunther Alhasawi, Fajer Alassaf and Alshimaa Hassan
Viruses 2026, 18(2), 152; https://doi.org/10.3390/v18020152 - 23 Jan 2026
Abstract
SARS-CoV-2, the causative virus of the COVID-19 pandemic, is a highly transmissible, enveloped, single-stranded RNA virus that has mutated into several variants, complicating vaccine strategies and drug resistance. Novel treatment modalities targeting conserved structural vulnerable points are essential to combat these variants. The [...] Read more.
SARS-CoV-2, the causative virus of the COVID-19 pandemic, is a highly transmissible, enveloped, single-stranded RNA virus that has mutated into several variants, complicating vaccine strategies and drug resistance. Novel treatment modalities targeting conserved structural vulnerable points are essential to combat these variants. The primary aim of the current study is to test the mechanical vulnerability of the SARS-CoV-2 virus envelope and spike proteins to focused, high-frequency ultrasound waves (25 MHz) in vitro. Utilizing a preliminary pretest and posttest study design, the study was conducted on a virus sample within a distilled water matrix, under controlled laboratory biosafety conditions. Since detailed imaging tools were unavailable, viral disruption was indirectly measured using real-time PCR cycle threshold (Ct) values. Ct values increased significantly after high-frequency ultrasound exposure, indicating a reduction in amplifiable viral genomic material. A paired t-test indicated a significant difference between the pretest and posttest Ct (p < 0.001), which is supported by Monte Carlo test results that revealed statistically significant shifting in viral load categories (p = 0.001, two-sided). Specifically, 85.7% of high-viral-load samples converted to low or moderate content, 46.7% of low or moderate samples were shifted to negative content. This intervention produced a large effect size (Cohen’s d = 2.422). These results indicate that ultrasound may offer a promising non-pharmacological approach to destroy or inactivate SARS-CoV-2 variants in an aqueous environment. Full article
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Sequencing Techniques and Genomics Technologies to Help with Diagnostics and Virus Characterization – Focus on COVID 19
edited by , Hugh E. Olsen, and
submission deadline 15 Apr 2021 | 10 articles | Viewed by 71818
Keywords: Genomics technologies; Sequencing techniques; Metagenomics; Virus sequencing; Genetic diagnostics; qPCR; Nanopore sequencing; Single-molecule real-time (SMRT) sequencing; Next-generation sequencing (NGS); Third-generation sequencing; Virus characterization; Long-read sequencing; Comparative genomics; Functional genomics; Diagnostic tests; Infectious diseases; Pandemic; SARS-CoV-2; COVID-19; Coronavirus; Genomic epidemiology; Population stratification; Genetic susceptibility; Host interactions
(This special issue belongs to the Section Technologies and Resources for Genetics)
TMPRSS2 and Other Host Factors in Influenza Virus and Coronavirus Infections
edited by and Sze Keong Tey
submission deadline 31 Jan 2026 | 2 articles | Viewed by 6856 | Submission Open
Keywords: TMPRSS2; host factors; influenza virus; coronavirus; viral infection; treatment of viral diseases
(This special issue belongs to the Section Human Virology and Viral Diseases)
Cardiovascular Effects of COVID-19: Acute and Chronic
edited by
submission deadline 31 Jan 2026 | 1 articles | Viewed by 2053 | Submission Open
Keywords: microthrombi; STEMI; long COVID; COVID related acute coronary syndromes; cardiovascular effects of COVID; biology; immune response; genetics; endothelial health
(This special issue belongs to the Section COVID Clinical Manifestations and Management)
Analysis of Modeling and Statistics for COVID-19, 2nd edition submission deadline 31 Jan 2026 | 2 articles | Viewed by 1985 | Submission Open
Keywords: COVID-19 statistics; epidemiological modeling; time series analysis; prediction techniques; outbreak spatial diffusion; daily reproduction number; contagion modeling; viral mutation modeling; virulence mechanisms; host immunity modeling; mitigation measures dynamics; vaccination policy
How COVID-19 Affects Cancer Patients
edited by
submission deadline 31 Jan 2026 | 15 articles | Viewed by 37790 | Submission Open
Keywords: COVID-19; pandemic; cancer; impact; incidence; mortality; lethality; disparities; gender
(This special issue belongs to the Section Cancer Epidemiology and Prevention)
SARS-CoV-2 Neutralizing Antibodies, 3rd Edition
edited by Youchun Wang
submission deadline 31 Jan 2026 | 4 articles | Viewed by 5227 | Submission Open
Keywords: SARS-CoV-2; neutralizing antibodies; neutralization assays; standards; monoclonal antibodies; vaccines; viral variants
(This special issue belongs to the Section Coronaviruses)

State-of-the-Art Webinars on COVID-19


WEBINAR 1: How to Avoid a New Lockdown?

The first webinar in the series, held on 17 April 2020, saw both Prof. Dr. Antoine Flahault, Director of the Institute of Global Health, University of Geneva, Switzerland, and Prof. Dr. Evelyne Bischof, Associate Professor, Shanghai University of Medicine and Health Sciences, Shanghai, China and Research physician, University Hospital of Basel, Basel, Switzerland speak on this topic.

The recording can be found here.

WEBINAR 2: Coronaviruses: History, Replication, Innate Immune Antagonism

The second webinar in the series, entitled “Coronaviruses: history, replication, innate immune antagonism”, saw Prof. Dr. Susan R. Weiss, Professor of Microbiology, Perelman School of Medicine, University of Pennsylvania speak on this topic.

The recording can be found here.

WEBINAR 3: Could the COVID-19 Crisis be the Opportunity to Make Cities Carbon Neutral, Liveable and Healthy

The third webinar in this series was presented by Prof. Dr. Mark Nieuwenhuijsen, a world leading expert in environmental exposure assessment, epidemiology, and health risk/impact assessment with a strong focus and interest on healthy urban living. 

The recording can be found here

WEBINAR 4: COVID-19 - Global Supply Chains and the SDGs

For the fourth webinar of this series, Prof. Dr. Max Bergman, Dr. Dorothea Schostok and Prof. Dr. Patrick Paul Walsh gave a presentation on Global Supply Chains and the SDGs. 

The recording can be found here.

WEBINAR 5: The New Role of Family Physicians in Times of COVID-19

The fifth webinar of the COVID-19 Series saw Prof. Dr. Christos Lionis discuss the new role of family physicians that emerged during the COVID-19 pandemic.

The recording can be found here.

WEBINAR 6: Survey on Symptoms/Signs, Protective Measures, Level of Awareness and Perception Regarding COVID-19 Outbreak among Dentists

In the sixth webinar of this series, Prof. Dr. Guglielmo Campus and Prof. Dr. Maria Grazia present and discuss the risk and the preventions that can and should be taken by dentists during this pandemic.

The recording can be found here.

WEBINAR 7: Living with COVID-19: An Early Intervention Therapeutic Strategy to Control the Pandemic

The seventh webinar of the COVID-19 series, Dr. Hamid Merchant discussed the different therapeutic strategies that can be adopted in the early stages of the infection.

The recording can be found here.

WEBINAR 8: Impact of COVID-19 on Routine Immunization, Reproduction and Pregnancy Outcome

For the eighth COVID-19 webinar, Prof. Dr. Jon Øyvind Odland discussed the effect that COVID-19 seems to have on pregnant women; whereas Prof. Dr. Giovanni Gabutti discussed the role of routine immunization as a way of fighting COVID-19.

The recording can be found here.

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