Incidence cumulée de l'infection au SARS-CoV-2 à l'Institut Pasteur de Tunis, mars 2021

Contexte

L'Institut Pasteur de Tunis (IPT) a été impliqué dans les activités de diagnostic biologique de l'infection par le SARS-CoV-2. De nombreux cas d'infection par le SRAS-CoV-2 ont été détectés parmi le personnel de l'IPT, mais la véritable propagation de l'infection au sein de cette institution était inconnue. Notre étude visait à mesurer l'étendue de l'infection par le SRAS-CoV-2 parmi les agents de l'IPT et de déterminer la proportion d'infections asymptomatiques.

Méthodes

Une enquête transversale exhaustive auprès des agents de l'IPT non encore vaccinés contre la COVID-19 a été menée au cours des deux dernières semaines de mars 2021 qui coïncidaient avec la fin de la deuxième vague de COVID-19 en Tunisie. Les échantillons de sérum collectés auprès des participants ont été testés à l'aide de deux tests ELISA développés à l'IPT pour détecter les immunoglobulines G dirigés contre le domaine de liaison au récepteur (RBD) de la protéine de pointe S (IgG anti-S-RBD) et contre la protéine de nucléocapside N (IgG anti-N) du virus SARS-CoV-2.

Résultats

Au total, 428 personnes ont été incluses dans l'étude. La prévalence des anticorps anti-SARS-CoV-2 (IgG anti-N et/ou IgG anti-SRBD) était de 32,7 % (intervalle de confiance 95 % : [28,0-36,9]) (22,2 % [18,2-25,9] avaient des IgG anti-N et 31,3 % [26,9-35,7] avaient des IgG anti-S-RBD). L'incidence cumulée de l'infection par le SRAS-CoV-2 (sérologie positive et/ou test RT-PCR antérieur positif) était de 39,7 % [35,0-44,2]. La proportion de formes asymptomatiques était de 32,9 %.

Discussion/Conclusion

s Nos résultats ont révélé une incidence relativement élevée d'infection par le SARS-COV-2 parmi les agents de l'IPT. Les échantillons recueillis avant la vaccination seraient très utiles pour les enquêtes séro-épidémiologiques de suivi post-vaccinal. La proportion considérable d'infections asymptomatiques souligne l'importance de l'intensification de la pratique des tests de dépistage pour rompre la chaine de transmission de l'infection.

Déclaration de liens d'intérêts

Les auteurs déclarent ne pas avoir de liens d'intérêts.

Determinants of healthcare workers’ willingness to receive the influenza vaccine in Tunisia

Background

Influenza is a contagious respiratory disease that may lead to severe illness. Given their frequent contact with ill individuals, healthcare workers (HCWs) are at elevated risk of developing influenza and of transmitting the disease to their patients. We aimed in this study to assess flu vaccination intention among Tunisian HCWs and to identify its determinants.

Methods

A cross sectional study was conducted among Tunisian HCWs with direct patient contact during the 2018-2019 influenza season. Participants were recruited in primary and secondary healthcare facilities according to a self-weighted multistage sampling. Factors associated with influenza vaccination intention were assessed using a multivariate logistic regression analysis.

Results

In this study, 1231 HCWs were enrolled with a mean age of 44.5±9.3 years and a sex ratio equal to 0.25. Among respondents, 43.1% (95% CI: [40.0-45.8]) declared their willingness to receive the IV if recommended for HCWs and provided for free. Participants who received the IV during the 2018-2019 influenza season ((ORa=34.42 [16.41-72.21]), who knew that IV is indicated annually for HCWs (ORa=1.66 [1.21-2.30]), who had high confidence regarding IV efficacy (ORa=1.99 [1.48-2.68]), who believed that IV should be mandatory for HCWs (ORa=2,36 [1.76-3.18]) and that HCWs' vaccination against influenza is important in order to protect patients (ORa=1.92 [1.37-2.69]) were more likely to be willing to receive the IV. However, nurses were less likely to be willing to receive the vaccine than physicians (ORa=0.66 [0.44-0.98]).

Conclusions

Less than half of participants reported their willingness to receive the IV. Our results suggest that flu vaccination acceptance is associated with higher IV uptake and with favorable attitudes regarding influenza vaccination. This highlights the need to implement regular flu awareness campaigns in healthcare facilities aiming to encourage vaccination among HCWs.

Key messages

Majority of healthcare workers reported their unwillingness to receive the influenza vaccine. Educating health personnel about the benefits of influenza vaccination to themselves and their patients is necessary.

Impact of mandatory institutional quarantine on sleep quality: A cross sectional Tunisian study

Background

Given the COVID-19 pandemic, Tunisian authorities have imposed quarantine in dedicated centers mainly for travelers coming from countries with highest coronavirus infection rates. Such restrictive measures may have a detrimental impact on people's mental health and can thus affect sleep. We aimed in this study to assess the impact of mandatory institutional quarantine on sleep quality in Tunisia and to determine factors associated with clinical insomnia.

Methods

Data were collected through a cross sectional study conducted from April to November 2020 among individuals who were in quarantine for 14 days including at least a week in a Tunisian quarantine center. Sleep quality was assessed using the Insomnia Severity Index. Factors associated with clinical insomnia were assessed using bivariate and multivariate analysis.

Results

In the present study, 506 participants were included with a mean age of 37.6±13.6 years. Majority (66.4%) were men. Nearly one fifth (19.2%) of surveyed individuals had symptoms of clinical insomnia. In multivariate analysis, we found that being a woman, spending longer time on covid-19 news per day, having experienced stigma during the quarantine period, financial difficulties due to the coronavirus pandemic and dissatisfaction by the accommodation conditions of the quarantine facility were independently associated with clinical insomnia.

Conclusions

Nearly one fifth of participants had clinical insomnia during the quarantine period. Providing a good sleep environment, educating sleep healthy behavior and giving adequate psychological support to quarantined individuals in quarantine centers is necessary.

Key messages

Among surveyed participants, 19.2% had symptoms of clinical insomnia.

Providing a good sleep environment in quarantine centers and providing mental health support to quarantined individuals is essential.

Anxiety and depression among individuals in mandatory institutional quarantine in Tunisia

Background

The COVID-19 pandemic is a challenging public health issue that have impacted people's health and livelihoods worldwide. Restrictive measures, such as quarantine, have been implemented in many countries in order to limit the spread of the virus. We aimed in this study to assess the impact of institutional mandatory quarantine on mental health in Tunisia and to determine factors associated with the occurrence of anxiety and or depression.

Methods

A cross sectional phone survey was conducted in Tunisia from April to November 2020 among people who were placed in mandatory institutional quarantine. Generalized anxiety disorder and depression were assessed using the Generalized anxiety disorder scale (GAD-7) and the Centre for Epidemiological Studies Depression Scale (CES-D-10). Bivariate and multivariate analyses were used to determine factors associated with the occurrence of depression and or anxiety symptoms.

Results

In the present study, 506 participants were enrolled with an age ranging from 18 to 83 years and a sex ratio equal to 1.9. More than third of participants (38.3%) had experienced anxiety and/or depressive symptoms. Being a woman, younger age, being a student, spending longer time on COVID-19 news, fear of infection in the quarantine facility, having experienced stigma, financial struggle due to the COVID-19 pandemic and dissatisfaction by the accommodations conditions of the quarantine facility were independently associated with occurrence of depression and or anxiety symptoms.

Conclusions

A high percentage of participants have experienced anxiety or depressive symptoms during the quarantine period. Providing mental health support and updated and relevant information to quarantined individuals is necessary. Improving the accommodation conditions in the quarantine facilities is also needed.

Key messages

More than third of participants had experienced anxiety and/or depressive symptoms. Good quality communication and mental health support are necessary in quarantine facilities.

Willingness of healthcare workers to recommend seasonal influenza vaccine to patients- Tunisia, 2019

Background

Most countries of the Eastern Mediterranean Region have low influenza vaccination coverage mainly among high risk groups. Advice to receive the influenza vaccine by healthcare workers (hcws) seems to be an important motivator for vaccine acceptance among patients. In this study, we aimed to describe the willingness of Tunisian hcws to recommend the seasonal influenza vaccine to patients and to assess its determinants.

Methods

A cross-sectional questionnaire-based study was conducted in Tunisian primary and secondary healthcare facilities during the 2018-2019 influenza season. A multivariate logistic regression was used to assess the factors associated with the willingness of hcws to recommend the influenza vaccine to patients.

Results

In the present study, 1231 hcws were included with a mean age of 44.5±9.3 and a sex ratio (Male/Female) equal to 0.25. Among respondents, more than three quarter (79.1%, 95% CI: [76.7-81.3]) declared their willingness to recommend the influenza vaccine to patients if available. In multivariate analysis, belief that influenza vaccine is a severe illness that may lead to death (adj.OR = 2.9, 95% CI: [1.9-4.1]) and previous influenza vaccine uptake among health professionals (adj.OR = 2.4, 95% CI: [1.5-3.9]) were independently associated with the willingness of hcws to recommend the flu vaccine to patients.

Conclusions

This study showed that hcws with a history of influenza immunization and those who were aware of influenza severity were more likely to be willing to recommend the influenza vaccine to patients. These findings should be considered in future educational programs to enhance hcws' recommendation of influenza vaccine.

Key messages

Majority of Tunisian healthcare workers declared their willingness to recommend the influenza vaccine to patients. Healthcare workers’ awareness of influenza severity and history of influenza vaccine uptake were associated with a higher willingness to recommend the flu vaccine.

Determinants of influenza vaccination intention among Tunisian elderly

Background

Influenza vaccination coverage among elderly remains unsatisfactory even in developed countries. Since attitudes are predictors of behavior, understanding factors influencing the intention to receive influenza vaccine (IV) among elderly may orientate interventions to increase vaccination rate. The aim of the current study was to identify factors associated to willingness to receive IV next season among Tunisian elderly.

Methods

During 2018 -2019 flu season a cross-sectional study was conducted among older persons aged 60 years and over with chronic disease attending primary and secondary health care facilities. The intention to get vaccinated against influenza was measured by means of a face to face questionnaire. Factors that affect willingness to receive IV were identified using a multiple logistic regression analysis.

Results

Of the 1191 older persons included, 19.4% [17.1-21.9] participants received IV in 2018-2019 flu season, 64.7% [61.9-67.3] expressed willingness to be vaccinated next season. Willingness to receive IV was more likely among persons with chronic pulmonary disease (ORa=2.6), those suffering from diabetes (ORa=1.6), those who received IV in 2018-2019 flu season (ORa=16.5), those who feel that they get enough information about vaccines and their safety (ORa=2.9) and persons who trust the advice of their health care providers (ORa=4.5).

Conclusions

Vaccination status was the most determinant factor associated to willingness to receive the vaccine. Therefore, sustainable efforts to promote IV may lead to cumulative increase of influenza vaccination coverage year by year. Doctors should be involved more in advocating IV and providing elderly with the necessary information about IV, but that could not be effective without a climate of trust between patients and health care providers.

Key messages

Positive self-experience of older persons with IV may change their perception about it and encourage them to adhere to the vaccine in the future. Elderly should be provided with the necessary information about IV in terms of effectiveness and safety.

Influenza immunization among Tunisian health care workers in the 2018-2019 influenza season

Background

Given the nature of their activities, health care workers (hcws) are at higher risk of contracting influenza and transmitting the disease to their patients. Influenza vaccine (IV) remains the most effective way to prevent influenza and its complications. To the best of our knowledge, no national data on IV coverage among hcws is available in Tunisia. The present study aimed to assess the flu vaccination coverage among Tunisian hcws in the 2018-2019 influenza season and factors associated with IV uptake through a study of knowledge and attitudes related to influenza vaccination.

Methods

A cross sectional study was conducted in Tunisian primary and secondary health care facilities from March to May 2019. Hcws with direct patient contact were recruited according to a self-weighted multistage sampling. Survey data collection was based on a face to face questionnaire containing both open and closed questions.

Results

A total of 1231 hcws were enrolled in this study. Among respondents, 15.3% (95% CI: [12.3-17.2]) were vaccinated against influenza during the 2018-2019 influenza season. High confidence regarding vaccine efficacy (OR = 3.5, 95%CI: 2.5-4.8), belief that hcws' influenza immunization may decrease illness and deaths among patients (OR = 1.7, 95% CI: 1.2-2.3) and belief that influenza vaccination can reduce work absenteeism (OR = 1.7, 95% CI: 1.2-2.4) were associated with a higher IV uptake among hcws. In addition, participants who mentioned hcws as a target group for influenza vaccination (OR = 2.0, 95% CI: 1.5-2.8) and who were agree that IV is indicated annually for hcws (OR = 3.1, 95% CI: 1.9-4.9) were more likely to receive the IV.

Conclusions

Influenza vaccination coverage among Tunisian health professionals in 2018-2019 was low. Our findings suggest that knowledge and attitudes regarding influenza vaccine influence vaccine compliance among hcws and should thus be targeted by vaccination campaigns to promote flu vaccine uptake in the health community.

Key messages

Vaccination coverage among Tunisian healthcare workers was low in the 2018-2019 influenza season. Our findings suggest that knowledge and attitudes regarding influenza vaccine influence vaccine uptake among Tunisian health care workers.

Prevalence of seasonal Influenza vaccination among Tunisian elderly

Background

Surveys to determine the uptake of influenza vaccine (IV) among the at-risk groups are required to evaluate the advancement of national vaccination strategies and the level of awareness in the surveyed population. In this context, the present study aimed to estimate influenza vaccination uptake in elderly in Tunisia during 2018-2019 influenza season and to assess their perceptions toward influenza and IV.

Methods

It was a national cross-sectional study conducted in 2019 in primary and secondary health care facilities, among persons aged 60 years and over with chronic disease. Data were collected using a standard administered questionnaire including questions about IV uptake, general knowledge and attitudes about influenza and IV. Perceptions of participants toward general statements about influenza and IV were compared by vaccination status using chi square test.

Results

In total, 1191 older persons were included. Nearly one third of participants (34.8% [32.2-37.6]) were vaccinated at least once at the past and 19.4% [17.1-21.9] received the vaccine during 2018-2019 influenza season. Compared to unvaccinated elderly, vaccinated persons were significantly more convinced that influenza is more dangerous for elderly people (90.0% vs. 82.2%, p = 0.008), that IV is recommended for older persons (88.7% vs. 70.1%, p < 0.001) and for those with chronic disease (86.1% vs. 64.1%, p < 0.001) and that IV can protect elderly persons (87.9% vs. 71.9%, p < 0.001) and those with chronic disease (88.3% vs. 66.3%, p < 0.001). Regarding attitude about the safety of the vaccine, while 14.4% of unvaccinated persons agreed that IV is not safe for older persons, only 9.5% of vaccinated elderly approved that statement (p = 0.060).

Conclusions

Our study showed a low influenza vaccination rate among Tunisian elderly. In order to promote IV, campaigns should focus on educating elderly regarding the seriousness of influenza and the efficiency and the safety of IV.

Key messages

Efforts must be invested to improve influenza vaccination coverage among Tunisian elderly especially those with chronic diseases. Educating elderly regarding influenza and IV is necessary since knowledge is a basis for adopting relevant attitudes and practices.

Modelling of seasonal influenza and estimation of the burden in Tunisia

The burden of influenza was estimated from surveillance data in Tunisia using epidemiological parameters of transmission with WHO classical tools and mathematical modelling. The incidence rates of influenza-associated influenza-like illness (ILI) per 100 000 were 18 735 in 2012/2013 season; 5536 in 2013/14 and 12 602 in 2014/15. The estimated proportions of influenza-associated ILI in the total outpatient load were 3.16%; 0.86% and 1.98% in the 3 seasons respectively. Distribution of influenza viruses among positive patients was: A(H3N2) 15.5%; A(H1N1)pdm2009 39.2%; and B virus 45.3% in 2014/2015 season. From the estimated numbers of symptomatic cases, we estimated that the critical proportions of the population that should be vaccinated were 15%, 4% and 10% respectively. Running the model for the different values of R0, we quantified the number of symptomatic clinical cases, the clinical attack rates, the symptomatic clinical attack rates and the number of deaths. More realistic versions of this model and improved estimates of parameters from surveillance data will strengthen the estimation of the burden of influenza.

[Comparative characterization of skin lesions observed in the three endemic varieties of cutaneous leishmaniasis in Tunisia]

BACKGROUND

The recent spread in the geographical distribution of the three forms of cutaneous leishmaniasis (CL) endemic in Tunisia has resulted in the coexistence of more than one species of Leishmania (L.) in some foci, rendering characterization on the basis of geographical criteria alone more difficult. The aim of the study was to establish clinical criteria associated with these noso-geographic forms, namely sporadic CL (SCL) due to L. infantum, zoonotic CL (ZCL) due to L. major and chronic CL (CCL) due to L. tropica.

PATIENTS AND METHODS

One hundred and twelve patients with biologically confirmed CL were involved in the study. Leishmania species was systematically identified by iso-enzyme analysis and/or PCR-RFLP. Details of the number, the location, the morphological aspect and the month of outbreak of the lesions were noted for each patient.

RESULTS

SCL lesions appeared later than ZCL lesions (53.8% of cases appeared from December onwards vs. 23.6%, P<0.001). ZCL lesions were often multiple (75%) and situated on the limbs (84.7%, P<0.001), whereas SCL lesions were single (92.3%, P<0.001) and located on the face (84.6%, P<0.001). CCL lesions were also single (78.6%) and located on the face (71.4%). The classical ulcerous presentation with scabs was mainly observed in ZCL patients (69.4%) and the erythematous presentation was described more frequently in SCL patients (75%; P<0.001).

CONCLUSION

The number, site, morphological aspect and month of outbreak of lesions could be considered as useful criteria that help differentiate between the three noso-geographical forms of CL prevailing in Tunisia. Such characterization is useful for the individual management of patients and for optimizing the combat against the disease.

[Relationship between temperature and mortality in the city of Tunis: 2005-2007]

The influence of thermal stress on health is proved. In the light of the current climate change this relationship should be extensively investigated. This study aims to describe the relationship between temperature and total mortality in the city of Tunis over a period of three years, from 2005 to 2007 using time series analysis. The form of the relation (crude and adjusted) between mortality and temperatures was investigated using Poisson generalized additive models (GAM). Confounders included in the models were pollutant, trend, calendar month, day of the week, the period of Ramadan, and holidays. The adjusted relationship between mortality and temperature was "V" shaped with a steeper slope for low temperatures than for high temperatures. The impact of heat on mortality will be further analyzed to refine our findings and to contribute to the elaboration of guidelines for preventive strategies.