scholarly journals Effectiveness of CoronaVac, ChAdOx1, BNT162b2 and Ad26.COV2.S among individuals with prior SARS-CoV-2 infection in Brazil

2021 ◽  
Author(s):  
Thiago Cerqueira-Silva ◽  
Jason R Andrews ◽  
Viviane S Boaventura ◽  
Otavio T Ranzani ◽  
Vinicius de Araujo Oliveira ◽  
...  
Keyword(s):  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Case Control ◽  
Rt Pcr ◽  
Symptomatic Infection ◽  
Series Completion ◽  
Negative Controls ◽  
Prior Infection ◽  
Control Study ◽  
Dose Vaccine

Background. COVID-19 vaccines have proven highly effective among SARS-CoV-2 naive individuals, but their effectiveness in preventing symptomatic infection and severe outcomes among individuals with prior infection is less clear. Methods. Utilizing national COVID-19 notification, hospitalization, and vaccination datasets from Brazil, we performed a case-control study using a test-negative design to assess the effectiveness of four vaccines (CoronaVac, ChAdOx1, Ad26.COV2.S and BNT162b2) among individuals with laboratory-confirmed prior SARS-CoV-2 infection. We matched RT-PCR positive, symptomatic COVID-19 cases with RT-PCR-negative controls presenting with symptomatic illnesses, restricting both groups to tests performed at least 90 days after an initial infection. We used multivariable conditional logistic regression to compare the odds of test positivity, and the odds of hospitalization or death due to COVID-19, according to vaccination status and time since first or second dose of vaccines. Findings. Among individuals with prior SARS-CoV-2 infection, vaccine effectiveness against symptomatic infection ≥ 14 days from vaccine series completion was 39.4% (95% CI 36.1-42.6) for CoronaVac, 56.0% (95% CI 51.4-60.2) for ChAdOx1, 44.0% (95% CI 31.5-54.2) for Ad26.COV2.S, and 64.8% (95% CI 54.9-72.4) for BNT162b2. For the two-dose vaccine series (CoronaVac, ChAdOx1, and BNT162b2), effectiveness against symptomatic infection was significantly greater after the second dose compared with the first dose. Effectiveness against hospitalization or death ≥ 14 days from vaccine series completion was 81.3% (95% CI 75.3-85.8) for CoronaVac, 89.9% (95% CI 83.5-93.8) for ChAdOx1, 57.7% (95% CI -2.6-82.5) for Ad26.COV2.S, and 89.7% (95% CI 54.3-97.7) for BNT162b2.

scholarly journals Effectiveness of CoronaVac in the setting of high SARS-CoV-2 P.1 variant transmission in Brazil: A test-negative case-control study

2021 ◽  
Author(s):  
Matt Hitchings ◽  
Otavio T. Ranzani ◽  
Mario S.S. Torres ◽  
Silvano Barbosa de Oliveira ◽  
Maria Almiron ◽  
...  
Keyword(s):  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Case Control ◽  
Vaccine Effectiveness ◽  
Rt Pcr ◽  
Fold Reduction ◽  
Negative Case ◽  
Health Organization ◽  
Negative Controls ◽  
Control Study

Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant P.1 emerged in the city of Manaus in late 2020 during a large resurgence of coronavirus disease (COVID-19), and has spread throughout Brazil. The effectiveness of vaccines in settings with widespread P.1 transmission has not been reported. Methods We performed a matched test-negative case-control study to estimate the effectiveness of an inactivated vaccine, CoronaVac, in healthcare workers (HCWs) in Manaus, where P.1 accounted for 75% of genotyped SARS-CoV-2 samples at the peak of its epidemic. Information from electronic surveillance databases was used to select cases of RT-PCR-confirmed SARS-CoV-2 infection and matched test-negative controls from 19 January, 2021 to 25 March, 2021. We used conditional logistic regression to estimate the effectiveness in reducing the odds of primary and secondary outcomes of, respectively, symptomatic and any SARS-CoV-2 infection. Findings Among 53,176 HCWs, 46,884 (88%) received at least one dose of CoronaVac and 2,656 (5%) underwent RT-PCR testing from 19 January, 2021 to 25 March, 2021. Of 2,797 RT-PCR tests, 776 (28%) were positive. 393 and 135 case-control pairs with and without, respectively, symptomatic illness were selected for the matched analyses. Vaccination with at least one dose was associated with a 0.50-fold reduction (adjusted vaccine effectiveness, 49.6%; 95% CI, 11.3 - 71.4) in the odds of symptomatic SARS-CoV-2 infection during the period 14 days or more after receiving the first dose. Estimated vaccine effectiveness of at least one dose against any SARS-CoV-2 infection was 35.1% (95% CI, -6.6 - 60.5) in the same time period. Interpretation Administration of at least one dose of CoronaVac showed effectiveness against symptomatic SARS-CoV-2 infection in the setting of epidemic P.1 transmission, underscoring the need to increase vaccination efforts in response to the spread of this variant in Brazil and globally. Funding Pan American Health Organization; Fundação Oswaldo Cruz (Fiocruz); Municipal Health Secretary of Manaus

scholarly journals Head-to-Head Accuracy Comparison of Three Commercial COVID-19 IgM/IgG Serology Rapid Tests

2020 ◽  
Vol 9 (8) ◽  
pp. 2369 ◽  
Author(s):  
Diego O. Andrey ◽  
Patrick Cohen ◽  
Benjamin Meyer ◽  
Giulia Torriani ◽  
Sabine Yerly ◽  
...  
Keyword(s):  
Whole Blood ◽  
Case Control Study ◽  
Case Control ◽  
Immunofluorescence Assay ◽  
Rapid Diagnostic Tests ◽  
Rt Pcr ◽  
Accuracy Comparison ◽  
Rapid Tests ◽  
Negative Controls ◽  
Control Study

Background: Comparative data of SARS-CoV-2 IgM/IgG serology rapid diagnostic tests (RDTs) is scarce. We thus performed a head-to-head comparison of three RDTs. Methods: In this unmatched case-control study, blood samples from 41 RT-PCR-confirmed COVID-19 cases and 50 negative controls were studied. The diagnostic accuracy of three commercially available COVID-19 RDTs: NTBIO (RDT-A), Orient-Gene (RDT-B), and MEDsan (RDT-C), against both a recombinant spike-expressing immunofluorescence assay (rIFA) and Euroimmun IgG ELISA, was assessed. RDT results concordant with the reference methods, and between whole blood and plasma, were established by the Kendall coefficient. Results: COVID-19 cases’ median time from RT-PCR to serology was 22 days (interquartile range (IQR) 13–31 days). Whole-blood IgG detection with RDT-A, -B, and -C showed 0.93, 0.83, and 0.98 concordance with rIFA. Against rIFA, RDT-A sensitivity (SN) was 92% (95% CI: 78–98) and specificity (SP) 100% (95% CI: 91–100), RDT-B showed 87% SN (95% CI: 72–95) and 98% SP (95% CI: 88–100), and RDT-C 100% SN (95% CI: 88–100) and 98% SP (95% CI: 88–100). Against ELISA, SN and SP were above 90% for all three RDTs. Conclusions: RDT-A and RDT-C displayed IgG detection SN and SP above 90% in whole blood. These RDTs could be considered in the absence of routine diagnostic serology facilities.

scholarly journals Effectiveness of mRNA-1273 against delta, mu, and other emerging variants of SARS-CoV-2: test negative case-control study

BMJ ◽  
2021 ◽  
pp. e068848
Author(s):  
Katia J Bruxvoort ◽  
Lina S Sy ◽  
Lei Qian ◽  
Bradley K Ackerson ◽  
Yi Luo ◽  
...  
Keyword(s):  
Hospital Admission ◽  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Case Control ◽  
Vaccine Effectiveness ◽  
Specimen Collection ◽  
Negative Case ◽  
Delta Infection ◽  
Control Study ◽  
Dose Vaccine

Abstract Objectives To evaluate the effectiveness of the mRNA-1273 vaccine against SARS-CoV-2 variants and assess its effectiveness against the delta variant by time since vaccination. Design Test negative case-control study. Setting Kaiser Permanente Southern California (KPSC), an integrated healthcare system. Participants Adult KPSC members with a SARS-CoV-2 positive test sent for whole genome sequencing or a negative test from 1 March 2021 to 27 July 2021. Interventions Two dose or one dose vaccination with mRNA-1273 (Moderna covid-19 vaccine) ≥14 days before specimen collection versus no covid-19 vaccination. Main outcome measures Outcomes included infection with SARS-CoV-2 and hospital admission with covid-19. In pre-specified analyses for each variant type, test positive cases were matched 1:5 to test negative controls on age, sex, race/ethnicity, and specimen collection date. Conditional logistic regression was used to compare odds of vaccination among cases versus controls, with adjustment for confounders. Vaccine effectiveness was calculated as (1–odds ratio)×100%. Results The study included 8153 cases and their matched controls. Two dose vaccine effectiveness was 86.7% (95% confidence interval 84.3% to 88.7%) against infection with the delta variant, 98.4% (96.9% to 99.1%) against alpha, 90.4% (73.9% to 96.5%) against mu, 96-98% against other identified variants, and 79.9% (76.9% to 82.5%) against unidentified variants (that is, specimens that failed sequencing). Vaccine effectiveness against hospital admission with the delta variant was 97.5% (92.7% to 99.2%). Vaccine effectiveness against infection with the delta variant declined from 94.1% (90.5% to 96.3%) 14-60 days after vaccination to 80.0% (70.2% to 86.6%) 151-180 days after vaccination. Waning was less pronounced for non-delta variants. Vaccine effectiveness against delta infection was lower among people aged ≥65 years (75.2%, 59.6% to 84.8%) than those aged 18-64 years (87.9%, 85.5% to 89.9%). One dose vaccine effectiveness was 77.0% (60.7% to 86.5%) against infection with delta. Conclusions Two doses of mRNA-1273 were highly effective against all SARS-CoV-2 variants, especially against hospital admission with covid-19. However, vaccine effectiveness against infection with the delta variant moderately declined with increasing time since vaccination.

scholarly journals Diabetes mellitus, anti-secretory drugs and other risk factors for campylobacter gastro-enteritis in adults: a case-control study

1997 ◽  
Vol 119 (3) ◽  
pp. 307-311 ◽  
Author(s):  
K. R. NEAL ◽  
R. C. B. SLACK
Keyword(s):  
Diabetes Mellitus ◽  
Risk Factors ◽  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Case Control ◽  
Postal Questionnaire ◽  
Foreign Travel ◽  
Drinking Milk ◽  
Campylobacter Infection ◽  
Control Study

The epidemiology of notified cases of campylobacter gastroenteritis in adults in Nottingham Health District was investigated using a case-control study with a postal questionnaire to ascertain data on risk factors. Over a 14-month period 531 cases (a 73% response rate of all laboratory confirmed cases) and 512 controls replied.Conditional logistic regression analysis was used to determine independent associations with infection. These included foreign travel (odds ratio (OR) 3·4; 95% confidence intervals (CI) 2·0–5·7), diabetes mellitus (OR 4·1, CI 1·1–17), medication with omeprazole (OR 3·5, CI 1·1–12) and H2 and H2 antagonists (OR 3·7, CI 1·3–15), contact with puppies (OR11·3, CI1·2–105), eating chicken (OR 1·4, CI 1·1–1·8) and drinking milk from bottles with tops damaged by a bird (OR 3·3, CI 1·0–11). Preparing main meals (OR 0·9, CI 0·8–1·0) and drinking delivered milk (OR 0·6, CI 0·4–0·9) were associated with a reduced risk of campylobacter infection.Foreign travel was reported in 25% of cases and another 15% had significant associations with other risk factors. The majority of cases, 60%, remained unexplained, indicating the need for further evolution of sporadic cases.

scholarly journals 717. Antibiotic treatment of Shiga toxin-producing Escherichia coli related gastroenteritis and the risk of hemolytic uremic syndrome: a population based matched case-control study in Japan

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S409-S410
Author(s):  
Shota Myojin ◽  
Kyongsun Pak ◽  
Mayumi Sako ◽  
Tohru Kobayashi ◽  
Takuri Takahashi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Shiga Toxin ◽  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Population Based ◽  
Case Control ◽  
Age Group ◽  
Matched Case ◽  
Matched Case Control Study ◽  
Control Study

Abstract Background The role of therapeutic intervention, particularly antibiotics, for Shiga toxin-producing Escherichia coli (STEC) related infection is controversial. Methods We performed a population based matched case-control study to assess the association between treatment (antibiotics, antidiarrheal agents and probiotics) for STEC related infections and HUS development. We identified all STEC HUS patients as cases and matched five non-HUS patients as controls using the data from the National Epidemiological Surveillance of Infectious Diseases (NESID) between January 1, 2017, and December 31, 2018. Further medical information was obtained by standardized questionnaires answered by physicians who registered each patient. We used multivariate conditional logistic regression model to evaluate the association between exposures (use of antibiotics, use of antidiarrheal agents, days between disease onset and fosfomycin administration [within two or three days]) and the development of HUS, by matched odds ratios (OR) and 95% confidence intervals (CI). Covariates we used were sex, age group, area code, presence of diarrhea and other factors. We also performed subgroup analyses using age (adults and children) as a stratification factor. Results 7,760 STEC related patients were registered in the NESID. We selected patients who had a record of HUS diagnosis (n=182) and matched controls without HUS (n=910). After collecting standardized paper-based questionnaires, we enrolled 90 HUS patients and 371 non-HUS patients for analysis. In the main analysis, matched OR of fosfomycin was 0.75(0.47-1.20) in all ages, 1.41(0.51-3.88) in adults and 0.58(0.34-1.01) in children. Matched OR of antidiarrheal agents was 2.07(1.07-4.03) in all ages, 1.84(0.32-10.53) in adults, 2.65(1.21-5.82) in children. Matched OR of probiotics was 0.86(0.46-1.61) in all ages, 0.76(0.21-2.71) in adults, 1.00(0.48-2.09) in children. There was no significant association between the timing of fosfomycin use in the first two or five days of illness and HUS development in any age group. Conclusion Our results suggest that fosfomycin might decrease the risk of HUS in children younger than 15 years of age with STEC confirmed bacterial gastroenteritis. Disclosures All Authors: No reported disclosures

scholarly journals Potential risk factors for multiple sclerosis in Rio de Janeiro: a case-control study

2009 ◽  
Vol 67 (2a) ◽  
pp. 229-234 ◽  
Author(s):  
Kátia Regina Penha da Silva ◽  
Regina Maria Papais Alvarenga ◽  
Oscar Fernandez y Fernandez ◽  
Hélcio Alvarenga ◽  
Luiz Claudio Santos Thuler
Keyword(s):  
Risk Factors ◽  
Multiple Sclerosis ◽  
Potential Risk ◽  
Rio De Janeiro ◽  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Case Control ◽  
Potential Risk Factors ◽  
Epidemiological Characteristics ◽  
Control Study

PURPOSE: To evaluate potential risk factors for the development of multiple sclerosis in Brazilian patients. METHOD: A case control study was carried out in 81 patients enrolled at the Department of Neurology of the Hospital da Lagoa in Rio de Janeiro, and 81 paired controls. A standardized questionnaire on demographic, social and cultural variables, and medical and family history was used. Statistical analysis was performed using descriptive statistics and conditional logistic regression models with the SPSS for Windows software program. RESULTS: Having standard vaccinations (vaccinations specified by the Brazilian government) (OR=16.2; 95% CI=2.3-115.2), smoking (OR=7.6; 95% CI=2.1-28.2), being single (OR=4.7; 95% CI=1.4-15.6) and eating animal brain (OR=3.4; 95% CI=1.2-9.8) increased the risk of developing MS. CONCLUSIONS: RESULTS of this study may contribute towards better awareness of the epidemiological characteristics of Brazilian patients with multiple sclerosis.

scholarly journals Case-Control Study of Rotavirus Vaccine Effectiveness Compared to Test-Negative Controls or Hospital Controls

2019 ◽  
Vol 29 (8) ◽  
pp. 282-287 ◽  
Author(s):  
Kaoru Araki ◽  
Megumi Hara ◽  
Chisato Shimanoe ◽  
Yuichiro Nishida ◽  
Muneaki Matsuo ◽  
...  
Keyword(s):  
Case Control Study ◽  
Case Control ◽  
Vaccine Effectiveness ◽  
Rotavirus Vaccine ◽  
Negative Controls ◽  
Control Study

scholarly journals Case-control study of an outbreak of acute toxoplasmosis in an industrial plant in the state of São Paulo, Brazil

2012 ◽  
Vol 54 (5) ◽  
pp. 239-244 ◽  
Author(s):  
Claudio Cesar Jaguaribe Ekman ◽  
Maria Fernanda do Valle Chiossi ◽  
Luciana Regina Meireles ◽  
Heitor Franco de Andrade Júnior ◽  
Walter Manso Figueiredo ◽  
...  
Keyword(s):  
Case Control Study ◽  
Acute Infection ◽  
Case Control ◽  
Acute Disease ◽  
Industrial Plant ◽  
Operational Risks ◽  
Asymptomatic Infections ◽  
Acute Toxoplasmosis ◽  
Negative Controls ◽  
Control Study

Foodborne diseases represent operational risks in industrial restaurants. We described an outbreak of nine clustered cases of acute illness resembling acute toxoplasmosis in an industrial plant with 2300 employees. These patients and another 36 similar asymptomatic employees were diagnosed with anti-T. gondii IgG titer and avidity by ELISA. We excluded 14 patients based on high IgG avidity and chronic toxoplasmosis: 13 from controls and one from acute disease other than T. gondii infection. We also identified another three asymptomatic employees with T.gondii acute infection and also anti-T. gondii IgM positive as remaining acute cases. Case control study was conducted by interview in 11 acute infections and 20 negative controls. The ingestion of green vegetables, but not meat or water, was observed to be associated with the incidence of acute disease. These data reinforce the importance of sanitation control in industrial restaurants and also demonstrate the need for improvement in quality control regarding vegetables at risk for T. gondii oocyst contamination. We emphasized the accurate diagnosis of indexed cases and the detection of asymptomatic infections to determine the extent of the toxoplasmosis outbreak.

scholarly journals Peran program kelas ibu hamil terhadap pelaksanaan ASI eksklusif di Gunung Kidul

2017 ◽  
Vol 33 (7) ◽  
pp. 317
Author(s):  
Dwi Andayani ◽  
Ova Emilia ◽  
Djauhar Ismail
Keyword(s):  
Exclusive Breastfeeding ◽  
Case Control Study ◽  
Conditional Logistic Regression ◽  
Control Sample ◽  
Case Control ◽  
Bivariate Analysis ◽  
Significance Level ◽  
Breastfeeding Rate ◽  
Regression Tests ◽  
Control Study

Purpose This study aimed to determine the effect of the implementation of the antenatal class toward exclusive breastfeeding.Methods The research was a case-control study with a quantitative approach. This research was also supported by a qualitative approach which aimed to complement and reinforce the results obtained from the quantitative data. Sample cases were 135 exclusive breastfeeding infants aged 6-12 months, and the control sample were 135 not exclusive breastfeeding infants aged 6-12 month. Data analysis used the McNemar and conditional logistic regression tests with significance level of p = <0.05 and 95% confidence interval.Results Bivariate analysis showed that antenatal class affected exclusive breastfeeding p = 0.026 and OR = 1.80 (95% CI: 1.03 to 3.24). In the results of multivariate analysis after controlling by including support of her husband and the ANC p = 0.03 and OR = 1.86 (95% CI: 1.05 to 3.30). Mothers who attended antenatal class have exclusive breastfeeding rate 1.86 times higher compared to mothers who did not attend the antenatal class.Conclusion The antenatal class can directly affect exclusive breastfeeding, in spite of controlling the support of her husband and the ANC.

scholarly journals Ecological and behavioural risk factors of scrub typhus in central Vietnam: a case-control study

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Hanh Thi Duc Tran ◽  
Jan Hattendorf ◽  
Hung Manh Do ◽  
Thanh Tien Hoang ◽  
Hang Thi Hai Hoang ◽  
...  
Keyword(s):  
Risk Factors ◽  
Case Control Study ◽  
Scrub Typhus ◽  
Conditional Logistic Regression ◽  
Febrile Illness ◽  
Case Control ◽  
Enzyme Linked Immunosorbent Assay ◽  
Protective Equipment ◽  
Related Factors ◽  
Control Study

Abstract Background The risk factors for scrub typhus in Vietnam remain unknown. Scrub typhus caused by Orientia tsutsugamushi often presents as an undifferentiated febrile illness and remains under appreciated due to the limited availability of diagnostic tests. This tropical rickettsial illness is increasingly recognized as an important cause of non-malaria acute undifferentiated fever in Asia. This study aimed to investigate behavioural and ecological related risk factors of scrub typhus to prevent this potentially life-threatening disease in Vietnam. Methods We conducted a clinical hospital-based active surveillance study, and a retrospective residence-enrolment date-age-matched case–control study in Khanh Hoa province, Vietnam, from August 2018 to March 2020. Clinical examinations, polymerase chain reaction and enzyme-linked immunosorbent assay IgM tests were applied to define cases and controls. All enrolled participants filled out a questionnaire including demographic socio-economic status, personal behaviors/protective equipment, habitat connections, land use, and possible exposure to the vector. Multivariable conditional logistic regression was used to define the scrub typhus associated risk factors. Results We identified 44 confirmed cases and matched them with 152 controls. Among cases and controls, the largest age group was the 41–50 years old and males accounted for 61.4% and 42.8%, respectively. There were similarities in demographic characteristics between the two groups, with the exception of occupation. Several factors were significantly associated with acquisition of scrub typhus, including sitting/laying directly on household floor [adjusted OR (aOR) = 4.9, 95% CI: 1.6–15.1, P = 0.006], household with poor sanitation/conditions (aOR = 7.9, 95% CI: 1.9–32.9, P = 0.005), workplace environment with risk (aOR = 3.0, 95% CI: 1.2–7.6, P = 0.020), always observing mice around home (aOR = 3.7, 95% CI: 1.4–9.9, P = 0.008), and use of personal protective equipment in the field (aOR = 0.4, 95% CI: 0.1–1.1, P = 0.076). Conclusions Ecological and household hygiene-related factors were more associated with scrub typhus infection, than individual-level exposure activities in the hyper-endemic area. These findings support local education and allow people to protect themselves from scrub typhus, especially in areas with limitations in diagnostic capacity. Graphical abstract

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