scholarly journals A foodborne norovirus outbreak in a nursing home and spread to staff and their household contacts

2019 ◽  
Vol 147 ◽  
Author(s):  
I. Parrón ◽  
J. Álvarez ◽  
M. Jané ◽  
T. Cornejo Sánchez ◽  
E. Razquin ◽  
...  
Keyword(s):  
Nursing Home ◽  
Close Contact ◽  
Case Control ◽  
Transmission Mechanism ◽  
Risk Of Infection ◽  
Gastroenteritis Outbreak ◽  
Case Control Studies ◽  
Household Contacts ◽  
Stool Samples ◽  
Cleaning Staff

AbstractOn 16 March 2018, a nursing home notified a possible acute gastroenteritis outbreak that affected 11 people. Descriptive and case–control studies and analysis of clinical and environmental samples were carried out to determine the characteristics of the outbreak, its aetiology, the transmission mechanism and the causal food. The extent of the outbreak in and outside the nursing home was determined and the staff factors influencing propagation were studied by multivariate analysis. A turkey dinner on March 14 was associated with the outbreak (OR 4.22, 95% CI 1.11–16.01). Norovirus genogroups I and II were identified in stool samples. The attack rates in residents, staff and household contacts of staff were 23.49%, 46.22% and 22.87%, respectively. Care assistants and cleaning staff were the staff most frequently affected. Cohabitation with an affected care assistant was the most important factor in the occurrence of cases in the home (adjusted OR 6.37, 95% CI 1.13–36.02). Our results show that staff in close contact with residents and their household contacts had a higher risk of infection during the norovirus outbreak.

scholarly journals From a case-control survey to a diagnostic viral gastroenteritis panel for testing of general practitioners’ patients

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0258680
Author(s):  
Lesla E. S. Bruijnesteijn van Coppenraet ◽  
Jacky Flipse ◽  
Janny A. Wallinga ◽  
Marloes Vermeer ◽  
Wil A. van der Reijden ◽  
...  
Keyword(s):  
Case Control ◽  
Viral Gastroenteritis ◽  
Human Parechovirus ◽  
Case Control Studies ◽  
Diagnostic Panel ◽  
Control Survey ◽  
Stool Samples ◽  
Statistical Relationships ◽  
Norovirus Gii ◽  
Enteropathogenic Viruses

Objective To evaluate the pathogenicity of a broad range of 11 possible gastroenteritis viruses, by means of statistical relationships with cases vs. controls, or Ct-values, in order to establish the most appropriate diagnostic panel for our general practitioner (GP) patients in the Netherlands (2010–2012). Methods Archived stool samples from 1340 cases and 1100 controls were retested using internally controlled multiplex real-time PCRs for putative pathogenic gastroenteritis viruses: adenovirus, astrovirus, bocavirus, enterovirus, norovirus GI and GII, human parechovirus, rotavirus, salivirus, sapovirus, and torovirus. Results The prevalence of any virus in symptomatic cases and asymptomatic controls was 16.6% (223/1340) and 10.2% (112/1100), respectively. Prevalence of astrovirus (adjusted odds ratio (aOR) 10.37; 95% confidence interval (CI) 1.34–80.06) and norovirus GII (aOR 3.10; CI 1.62–5.92) was significantly higher in cases versus controls. Rotavirus was encountered only in cases. We did not find torovirus and there was no statistically significant relationship with cases for salivirus (aOR 1,67; (CI) 0.43–6.54)), adenovirus non-group F (aOR 1.20; CI 0.75–1.91), bocavirus (aOR 0.85; CI 0.05–13.64), enterovirus (aOR 0.83; CI 0.50–1.37), human parechovirus (aOR 1.61; CI 0.54–4.77) and sapovirus (aOR 1.15; CI 0.67–1.98). Though adenovirus group F (aOR 6.37; CI 0.80–50.92) and norovirus GI (aOR 2.22, CI: 0.79–6.23) are known enteropathogenic viruses and were more prevalent in cases than in controls, this did not reach significance in this study. The Ct value did not discriminate between carriage and disease in PCR-positive subjects. Conclusions In our population, diagnostic gastroenteritis tests should screen for adenovirus group F, astrovirus, noroviruses GI and GII, and rotavirus. Case-control studies as ours are lacking and should also be carried out in populations from other epidemiological backgrounds.

Risk factors for cholera transmission in Haiti during inter-peak periods: insights to improve current control strategies from two case-control studies

2013 ◽  
Vol 142 (8) ◽  
pp. 1625-1635 ◽  
Author(s):  
F. GRANDESSO ◽  
M. ALLAN ◽  
P. S. J. JEAN-SIMON ◽  
J. BONCY ◽  
A. BLAKE ◽  
...  
Keyword(s):  
Risk Factors ◽  
Close Contact ◽  
Control Strategies ◽  
Case Control ◽  
Current Control ◽  
Case Control Studies ◽  
Street Vendors ◽  
Awareness Campaigns ◽  
Human Contact ◽  
Prevention Messages

SUMMARYTwo community-based density case-control studies were performed to assess risk factors for cholera transmission during inter-peak periods of the ongoing epidemic in two Haitian urban settings, Gonaives and Carrefour. The strongest associations were: close contact with cholera patients (sharing latrines, visiting cholera patients, helping someone with diarrhoea), eating food from street vendors and washing dishes with untreated water. Protective factors were: drinking chlorinated water, receiving prevention messages via television, church or training sessions, and high household socioeconomic level. These findings suggest that, in addition to contaminated water, factors related to direct and indirect inter-human contact play an important role in cholera transmission during inter-peak periods. In order to reduce cholera transmission in Haiti intensive preventive measures such as hygiene promotion and awareness campaigns should be implemented during inter-peak lulls, when prevention activities are typically scaled back.

scholarly journals Professional practice for COVID-19 risk reduction among health care workers: a Cross-Sectional Study with Matched Case-Control Comparison

2021 ◽  
Author(s):  
Sarah Wilson ◽  
Audrey Mouet ◽  
Camille Jeanne-Leroyer ◽  
France Borgey ◽  
Emmanuelle Odinet-Raulin ◽  
...  
Keyword(s):  
Risk Factors ◽  
Health Care ◽  
Professional Practice ◽  
Health Care Workers ◽  
Case Control ◽  
Risk Of Infection ◽  
Case Control Studies ◽  
Cross Sectional ◽  
Care Workers ◽  
Increased Risk

AbstractBackgroundHealth care workers (HCWs) are particularly exposed to COVID-19 and therefore it is paramount to study preventive measures in this population.AimTo investigate socio-demographic factors and professional practice associated with the risk of COVID-19 among HCWs in health establishments in Normandy, FranceMethodsA cross-sectional and 3 case-control studies were conducted in order to explore the possible risk factors that lead to SARS-CoV2 transmission within HCWs, based on an online questionnaire. The case-control studies focused on risk factors associated with care of COVID-19 patients, care of non COVID-19 patients and contacts between colleagues.FindingsAmong 2,058 respondents, respectively 1,363 (66.2%) and 695 (33.8%) in medical and medico-social establishments, 301 (14.6%) reported having been infected by SARS-CoV2. When caring for COVID-19 patients, HCWs who declared wearing respirators, either for all patient care (ORa 0.39; 95% CI: 0.29-0.51) or only when exposed to aerosol-generating procedures (ORa 0.56; 95% CI: 0.43-0.70), had a lower risk of infection compared with HCWs who declared wearing mainly surgical masks. During care of non COVID-19 patients, wearing mainly a respirator was associated with a higher risk of infection (ORa 1.84; 95% CI: 1.06-3.37). An increased risk was also found for HCWs who changed uniform in workplace changing rooms (ORa 1.93; 95% CI: 1.63-2.29).ConclusionCorrect use of PPE adapted to the situation and risk level is essential in protecting HCWs against infection.

Case-Control Studies

2009 ◽  
Author(s):  
Ruth H. Keogh ◽  
D. R. Cox
Keyword(s):  
Case Control ◽  
Case Control Studies

Clinical Trials in Thrombosis: Secondary Prevention of Myocardial Infarction

1976 ◽  
Vol 35 (01) ◽  
pp. 049-056 ◽  
Author(s):  
Christian R Klimt ◽  
P. H Doub ◽  
Nancy H Doub
Keyword(s):  
Myocardial Infarction ◽  
Secondary Prevention ◽  
Case Control ◽  
Therapeutic Effects ◽  
Case Control Studies ◽  
Definitive Answer ◽  
Inhibition Of Platelet Aggregation ◽  
Prospective Trials

SummaryNumerous in vivo and in vitro experiments, investigating the inhibition of platelet aggregation and the prevention of experimentally-induced thrombosis, suggest that anti-platelet drugs, such as aspirin or the combination of aspirin and dipyridamole or sulfinpyrazone, may be effective anti-thrombotic agents in man. Since 1971, seven randomized prospective trials and two case-control studies have been referenced in the literature or are currently being conducted, which evaluate the effects of aspirin, sulfinpyrazone, or dipyridamole in combination with aspirin in the secondary prevention of myocardial infarction. A critical review of these trials indicates a range of evidence from no difference to a favorable trend that antiplatelet drugs may serve as anti-thrombotic agents in man. To date, a definitive answer concerning the therapeutic effects of these drugs in the secondary prevention of coronary heart disease is not available.

Association between ALDH2 Gene Polymorphism and Late-onset Alzheimer Disease: An Up-to-date Meta-analysis

2020 ◽  
Vol 17 (2) ◽  
pp. 105-111
Author(s):  
Haitao Liu ◽  
Wei Ge ◽  
Wei Chen ◽  
Xue Kong ◽  
Weiming Jian ◽  
...  
Keyword(s):  
Gene Polymorphism ◽  
Large Scale ◽  
Late Onset ◽  
Meta Analysis ◽  
Case Control ◽  
Cochrane Library ◽  
Positive Trend ◽  
Case Control Studies ◽  
China National Knowledge Infrastructure ◽  
Aldh2 Gene

Objectives: Previous case-control studies have focused on the relationship between ALDH2 gene polymorphism and late-onset Alzheimer's Disease (LOAD), but no definite unified conclusion has been reached. Therefore, the correlation between ALDH2 Glu504Lys polymorphism and LOAD remains controversial. To analyze the correlation between ALDH2 polymorphism and the risk of LOAD, we implemented this up-to-date meta-analysis to assess the probable association. Methods: Studies were searched through China National Knowledge Infrastructure (CNKI), VIP Database for Chinese Technical Periodicals, China Biology Medicine, PubMed, Cochrane Library, Clinical- Trials.gov, Embase, and MEDLINE from January 1, 1994 to December 31, 2018, without any restrictions on language and ethnicity. Results: Five studies of 1057 LOAD patients and 1136 healthy controls met our criteria for the analysis. Statistically, the ALDH2 GA/AA genotype was not linked with raising LOAD risk (odds ratio (OR) = 1.48, 95% confidence interval (CI) = 0.96-2.28, p = 0.07). In subgroup analysis, the phenomenon that men with ALDH2*2 had higher risk for LOAD (OR = 1.72, 95%CI = 1.10-2.67, p = 0.02) was observed. Conclusions: This study comprehends only five existing case-control studies and the result is negative. The positive trend might appear when the sample size is enlarged. In the future, more large-scale casecontrol or cohort studies should be done to enhance the association between ALDH2 polymorphism and AD or other neurodegenerative diseases.

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