1. Introduction
Cancers are the second leading cause of mortality around the world, responsible for more than 10 million, or nearly 20%, of all deaths in 2023 [
1]. It has been estimated that nearly 40% of all new cancer cases in 2022 were linked to preventable causes [
2]. These causes comprised around 30 factors, including, among others, smoking, alcohol consumption, 13 occupational exposures, and nine infectious agents [
2,
3]. Lung, stomach and cervical cancers represented nearly half of all preventable cases in both men and women [
2,
3]. The last one, cervical cancer (CC), is the fourth most common cancer in women globally in 2023, with an estimated number of 886,538 diagnosed women, and is among the top ten in terms of mortality, with about 369,397 deaths [
4]. Most of these cases and deaths are reported in low- and middle-income countries [
5].
CC is overwhelmingly caused by oncogenic types of human papillomavirus (HPV), a common sexually transmitted virus with a cutaneous and mucosal tropism that could affect the skin, throat, and anal and genital areas [
6]. Although HPV infects silently almost all sexually active people at some point in their lives, its persistence could cause genital warts and cancers, mainly cervical cancer in women and other less common cancers in different organs in the oropharyngeal, the anal and the genital areas in both genders [
7].
Fortunately, CC is considered a highly preventable disease [
6]. This could be done through HPV vaccination and early screening and treatment of precancerous lesions [
8].
Vaccination is one of the most cost-effective tools to prevent CC and HPV-related cancers. Several HPV vaccines have been licensed worldwide. However, only five of them are currently prequalified by the WHO [
6,
9]. All these vaccines protect against highly pathogenic HPV types responsible for more than three-quarters of CC cases [
6]. These vaccines, which have proved their safety, are in priority recommended for all girls aged 9–14 years, before their sexual debut. Some countries have additionally included boys in their HPV vaccination programs to further decrease HPV circulation in the population and prevent HPV-associated cancers among males [
6]. Currently, more than 150 countries have included the HPV vaccine in their national immunization program [
10]. However, vaccination rates remain low, particularly in low- and middle-income countries [
6,
11,
12]. These rates are far from the 90% vaccine coverage target by the year 2030 fixed in the WHO global strategy to accelerate the elimination of cervical cancer (WHO, 2020 global). The other targets of this strategy are to achieve the screening of 70% of women by the age of 35 years, and again at 45 years old, and to treat 90% of women with cervical precancer or cancer [
13]. If this goal is met in 2030, more than 300,000 deaths might be averted in the same year, over 14 million by 2070, and over 62 million by 2120 [
14].
To achieve this goal, focus should remain not only on ensuring vaccine accessibility and expanding screening and treatment facilities but also on increasing awareness and knowledge about CC, HPV infection, vaccination, and CC early screening [
15,
16]. In fact, awareness, knowledge and conspiracy beliefs are intimately associated with vaccine and screening uptake [
17,
18,
19,
20,
21,
22]. In this way, several studies were undertaken to evaluate the level of knowledge, attitude, and practice throughout the world [
22,
23,
24,
25,
26,
27], even before the introduction of the vaccine. This type of survey is crucial for identifying who is unprepared, what misinformation is circulating, which messengers matter most, and how to tailor education and communication before rollout begins. This is the case in Algeria, where the vaccine is not yet introduced, even though CC is ranked fourth among female cancers with more than 1500 cases annually and 15.2 million women above 15 years old at risk of developing CC [
28,
29]. Without vaccination, the number of deaths is estimated to rise by more than 95% by 2040 compared to 2020 [
30]. The prevention strategy in the country is mainly based on early screening, officially recommended since 2003 for women aged 30 to 65 years at a frequency of 3 years [
30]. However, 70% of CC cases are detected late in Algeria [
29]. These data suggest a lack of awareness and knowledge about CC and HPV and low adherence to early screening [
22]. Thus, raising awareness and knowledge about CC and HPV may aid in the adoption of more positive attitudes and behaviors around vaccination and early screening.
In this way, this study was conducted to evaluate the level of awareness and knowledge about CC and HPV among Algerians and their attitudes toward HPV vaccination shortly before its rollout.
4. Discussion
This study provides up-to-date information regarding awareness, knowledge, and attitudes on CC and HPV in a sample of the Algerian population. The results revealed a high level of awareness of CC (76.3%). The rate of awareness was expectedly higher among females (85.1%) than males (71.1%). The same observation was reported by Mbulawa et al. [
34] in South Africa and El Mansouri et al. [
35] in Morocco. The rate of awareness reported among females aligns with the rate observed among female students reported previously in Algeria (88.4%%) [
22], and also with the rates obtained among females in Kenya (86%) [
27], in Kuwait (85.8%) [
36], and among female university students in Morocco (81.1–89%) [
35,
37]. However, the rate of awareness could vary substantially among females according to their sociodemographic characteristics, including age, marital status, residence, and profession [
38,
39,
40,
41,
42,
43,
44,
45,
46].
In contrast to the results of previous studies in Algeria [
22,
47], 58.2% were aware of its early detection, while nearly all female participants declared having not undergone CC screening. By omitting young age, lack of awareness was the most common barrier cited by the study participants. In the same way, a systematic review conducted in low- and middle-income countries found that the most important barrier to CC screening uptake is the lack of information and education about CC, CC screening, and prevention [
48]. More intriguingly, a study in Tanzania revealed that 70.3% of university students did not think that screening helps to prevent CC [
49]. In addition, a study conducted in the Eastern Cape Province rural community in South Africa revealed that women previously screened for CC had a significantly higher cervical knowledge score than those who had never been screened [
34]. It is worth noting that one of the WHO objectives to eliminate CC and sexually transmitted diseases is to increase the percentage of women being screened to 70% by 2030 [
13].
On the other hand, about half, 50.9%, of the participants who had heard of CC declared knowing its cause, and the majority of them incriminated HPV. Later, 115 out of the 133 students who had heard of HPV (86.5%) were aware that this virus can cause CC. Except for certain populations, including mainly medical students [
23], the lack of knowledge about the link between CC and HPV is common. If this information was shared by half of female staff in a Nigerian university (50%) [
46] and more than four of ten women in South Africa (43.2%) [
34], low rates were reported among rural (22.9%) and urban (24.4%) women in India [
45], young women of Dhulikhel municipality in Nepal (20.4%) [
42], women in hard-to-reach areas of Bangladesh and their family decision-makers (~20%) [
41], and women in the Caribbean indigenous community (17%) [
40]. A recent systematic review reported that only 14% of Arab women knew that HPV causes CC [
50]. More intriguingly, a recent study in Morocco revealed that only 10% of parents of young girls knew that cervical cancer is caused by a persistent HPV infection [
51].
Of note, less than a third of the participants (32.1%) of our study declared having heard of HPV. The same rate of awareness was reported among women of the western region in Saudi Arabia (34.6%) [
25], while higher rates were reported among women of reproductive age in Kiambu County, Kenya (44.7%) [
27], and Kuwaiti female students (55.3%) [
24]. A much higher rate of awareness of HPV was reported in the United States of America (USA), ranging from 81.8% to 95.3% among women [
52] and college students [
53], respectively. These high rates may certainly be related to the multiple public health campaigns designed to promote the benefits of HPV vaccination to parents and adolescents in this country [
53]. This supports the idea that there is a need for awareness campaigns for the Algerian population about this infectious agent.
Higher rates were also reported among medical students in some Arab countries, including Jordan (72%) [
23], Saudi Arabia (91.7%) [
54], and the United Arab Emirates (97%) [
55], while the rate was very low among students in the neighboring country of Morocco (10 to 14.7%) [
35,
37].
In our study, healthcare workers, older individuals (over 30 years old), and those with a high financial level showed the highest rates of awareness of HPV, while female gender was not a significant predictor. In a previous study among Algerian students, females were nearly two times as likely to have heard of HPV as males (OR = 1.7, 95% CI = 1.161–2.489) [
22]. Regarding age, a study conducted in the western region of Saudi Arabia reported that women aged more than 40 years were less aware of HPV than younger women [
25]. The same observation was reported among female caregivers in the USA, where younger ones aged 21–50 were nearly 2.5 times more likely to have heard of HPV than their counterparts (OR = 2.47, 95% CI = 1.49–4.08) [
26].
In addition to the low rate of awareness about HPV reported in this survey, multiple gaps of knowledge were found among those who heard of this pathogen. Particularly, more than half of these participants were not aware that HPV can cause cancer in organs other than cervix, that HPV infection cannot be cured with medicines, and that antibiotics are not effective against HPV. Similar gaps of knowledge were previously reported among students in Algeria [
22], and in other countries [
23,
24]. However, the striking result is the fact that nearly four of ten of those who had heard of HPV were not aware of the availability of the HPV vaccine. Even though the rate of awareness is higher than the rate reported by Bencherit et al. [
22] among university students in our country, this rate remains very low when adjusted to the total number of participants in our sample. In general, awareness of HPV vaccine varied substantially, with developed countries showing the highest rates of awareness [
37,
51,
53]. More interestingly, high proportions of participants were not aware of the national program to prevent CC and HPV infections in some low-and middle-income countries [
49,
51].
Not surprisingly, all but three of the participants who had heard of HPV in our study population were unvaccinated. This finding is a consequence of the absence of the HPV vaccine in the national immunization program and the lack of public awareness campaigns to promote its acceptability. However, nearly a third of these students were willing to get the vaccine if available (30.8%). This rate is higher than the rate reported among female students in our country (26.7%) [
22], but remains lower than the rates reported in other African and Arabic countries including Morocco (60–67%) [
37,
51], Kuwait (57.4–69.8%) [
24,
36], the United Arab Emirates (74%) [
55], Saudi Arabia (75.8%), [
25] and Jordan (75%) [
23]. The low rate of vaccine acceptance remains distant from the WHO 90-70-90 goal of 90% vaccinated women by 2030 [
13].
This low rate of acceptance could certainly be related to the lack of education regarding CC, HPV, and HPV vaccination. The role of awareness campaigns and healthcare providers was very limited in public awareness in our study. In fact, targeted awareness campaigns and healthcare providers’ recommendations are considered key factors for vaccine acceptance and uptake [
56,
57]. A recent meta-analysis reported that provider recommendation increased vaccination uptake from 24% to 60% [
58]. Unfortunately, the role of healthcare providers in the spreading of information tends to decrease in favor of social media platforms in multiple countries, including Algeria [
22,
25,
50]. This shift towards informal sources of information is concerning, given the documented proliferation of misinformation about vaccine safety and efficacy on social media platforms, thus reinforcing the endorsement of conspiracy theories [
50]. In our study, conspiracy beliefs were significantly associated with vaccine reluctance. Similar results were previously reported, especially among students in Algeria and in other Arab countries [
22,
23,
24,
50].
In addition, complacency, which refers to the underestimation of disease risk and doubts regarding the necessity of vaccination, was the most important factor contributing to HPV vaccine reluctance and hesitancy in our study. The same observation was reported among students in Algeria [
22], female students in Kuwait [
24], medical students in Jordan [
23], and women in Saudi Arabia [
25]. A recent study among adolescents in China revealed that high complacency, low confidence, and low HPV knowledge were significant determinants of HPV vaccine hesitancy [
59].
Finally, this study has shown some limitations that could affect the quality of its results. The cross-sectional online design could be subject to multiple biases. The cross-sectional nature of this survey allows it to provide information about the period from study that may change over time. The online nature did not allow for obtaining a representative sample since it can marginalize some categories, including those with limited access to the Internet and older individuals who are generally less connected to social media than younger ones. Furthermore, the self-administered questionnaire nature of this survey could be subject to social desirability biases. Finally, due to the country’s epidemiological context and national health policy, which plans to introduce HPV vaccination primarily for cervical cancer prevention, our study focused exclusively on CC, without considering other HPV-related cancers. In addition, attitudes toward HPV vaccination were assessed only among female participants, in line with the expected target population of the future vaccination program. Consequently, our findings cannot be generalized to males, despite the fact that HPV vaccination also protects against several other HPV-related cancers affecting both sexes.