Two Birds With One Stone: Estimating Population Vaccination Coverage From a Test-negative Vaccine Effectiveness Case-control Study

Abstract Background: Measles is a highly infectious viral disease. In August 2017, Lyantonde District, Uganda reported a measles outbreak to Uganda Ministry of Health. We investigated the outbreak to assess the scope, factors facilitating transmission, and recommend control measures. Methods: We defined a probable case as sudden onset of fever and generalized rash in a resident of Lyantonde, Lwengo, or Rakai Districts from 1 June-30 September 2017, plus ≥1 of the following: coryza, conjunctivitis, or cough. A confirmed case was a probable case with serum positivity of measles-specific IgM. We conducted a neighborhood- and age-matched case-control study to identified exposure factors, and used conditional logistic regression to analyze the data. We estimated vaccine effectiveness and vaccination coverage. Findings: We identified 81 cases (75 probable, 6 confirmed); 4 patients (4.9%) died. In the case-control study, 47% of case-patients and 2.3% of controls were hospitalized at Lyantonde Hospital pediatric department for non-measles conditions 7-21 days before case-patient’s onset (OR adj =34, 95%CI: 5.1-225). Estimated vaccine effectiveness was 95% (95%CI: 75-99%) and vaccination coverage was 76% (95%CI: 68-82%). During the outbreak, an “isolation” ward was established inside the general pediatric ward where there was mixing of both measles and non-measles patients. Conclusions This outbreak was amplified by nosocomial transmission and facilitated by low vaccination coverage. We recommended moving the isolation ward outside of the building, supplemental vaccination, and vaccinating pediatric patients during measles outbreaks.

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Measles Outbreak Amplified in a Pediatric Ward: Lyantonde District, Uganda, August 2017

10.21203/rs.2.12738/v1 ◽

2019 ◽

Author(s):

Claire Biribawa ◽

Joselyn Annet Atuhairwe ◽

Lilian Bulage ◽

Denis Othuba Okethwangu ◽

Benon Kwesiga ◽

...

Keyword(s):

Vaccination Coverage ◽

Case Control Study ◽

Conditional Logistic Regression ◽

Case Control ◽

Vaccine Effectiveness ◽

Pediatric Ward ◽

Probable Case ◽

Measles Outbreak ◽

Isolation Ward ◽

Control Study

Abstract Background Measles is a highly infectious viral disease. In August 2017, Lyantonde District, Uganda reported a measles outbreak to Uganda Ministry of Health. We investigated to assess the outbreak scope, factors facilitating transmission, and recommend control measures. Methods We defined a probable case as sudden onset of fever and generalized rash in a resident of Lyantonde, Lwengo, or Rakai Districts from 1 June-30 September 2017, plus ≥1 of the following: coryza, conjunctivitis, or cough. A confirmed case was a probable case with serum positivity of measles-specific IgM. We conducted a neighborhood- and age-matched case-control study to identified exposure factors, and used conditional logistic regression to analyze the data. We estimated vaccine effectiveness and vaccination coverage. Findings We identified 81 cases (75 probable, 6 confirmed); 4 patients (4.9%) died. In the case-control study, 47% of case-patients and 2.3% of controls were hospitalized at Lyantonde Hospital pediatric department for non-measles conditions 7-21 days before case-patient’s onset (ORadj=34, 95%CI: 5.1-225). Estimated vaccine effectiveness was 95% (95%CI: 75-99%) and vaccination coverage was 76% (95%CI: 68-82%). During the outbreak, an “isolation” ward was established inside the pediatric ward. Measles and non-measles patients were mixed in regular pediatric wards. Conclusion This outbreak was amplified by nosocomial transmission and facilitated by low vaccination coverage. We recommended moving the isolation ward outside of the building, supplemental vaccination, and vaccinating pediatric patients during measles outbreaks.

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Measles Outbreak Amplified in a Pediatric Ward: Lyantonde District, Uganda, August 2017

10.21203/rs.2.12738/v2 ◽

2019 ◽

Author(s):

Claire Biribawa ◽

Joselyn Annet Atuhairwe ◽

Lilian Bulage ◽

Denis Othuba Okethwangu ◽

Benon Kwesiga ◽

...

Keyword(s):

Vaccination Coverage ◽

Case Control Study ◽

Conditional Logistic Regression ◽

Case Control ◽

Vaccine Effectiveness ◽

Pediatric Ward ◽

Probable Case ◽

Measles Outbreak ◽

Isolation Ward ◽

Control Study

Abstract Background: Measles is a highly infectious viral disease. In August 2017, Lyantonde District, Uganda reported a measles outbreak to Uganda Ministry of Health. We investigated to assess the outbreak scope, factors facilitating transmission, and recommend control measures. Methods: We defined a probable case as sudden onset of fever and generalized rash in a resident of Lyantonde, Lwengo, or Rakai Districts from 1 June-30 September 2017, plus ≥1 of the following: coryza, conjunctivitis, or cough. A confirmed case was a probable case with serum positivity of measles-specific IgM. We conducted a neighborhood- and age-matched case-control study to identified exposure factors, and used conditional logistic regression to analyze the data. We estimated vaccine effectiveness and vaccination coverage. Findings: We identified 81 cases (75 probable, 6 confirmed); 4 patients (4.9%) died. In the case-control study, 47% of case-patients and 2.3% of controls were hospitalized at Lyantonde Hospital pediatric department for non-measles conditions 7-21 days before case-patient’s onset (ORadj=34, 95%CI: 5.1-225). Estimated vaccine effectiveness was 95% (95%CI: 75-99%) and vaccination coverage was 76% (95%CI: 68-82%). During the outbreak, an “isolation” ward was established inside the pediatric ward. Measles and non-measles patients were mixed in regular pediatric wards. Conclusion:This outbreak was amplified by nosocomial transmission and facilitated by low vaccination coverage. We recommended moving the isolation ward outside of the building, supplemental vaccination, and vaccinating pediatric patients during measles outbreaks.

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Measles Outbreak Amplified in a Pediatric Ward: Lyantonde District, Uganda, August 2017

10.21203/rs.2.12738/v5 ◽

2020 ◽

Author(s):

Claire Biribawa ◽

Joselyn Annet Atuhairwe ◽

Lilian Bulage ◽

Denis Othuba Okethwangu ◽

Benon Kwesiga ◽

...

Keyword(s):

Vaccination Coverage ◽

Case Control Study ◽

Conditional Logistic Regression ◽

Case Control ◽

Vaccine Effectiveness ◽

Pediatric Ward ◽

Probable Case ◽

Measles Outbreak ◽

Isolation Ward ◽

Control Study

Abstract Background: Measles is a highly infectious viral disease. In August 2017, Lyantonde District, Uganda reported a measles outbreak to Uganda Ministry of Health. We investigated the outbreak to assess the scope, factors facilitating transmission, and recommend control measures.Methods: We defined a probable case as sudden onset of fever and generalized rash in a resident of Lyantonde, Lwengo, or Rakai Districts from 1 June-30 September 2017, plus ≥1 of the following: coryza, conjunctivitis, or cough. A confirmed case was a probable case with serum positivity of measles-specific IgM. We conducted a neighborhood- and age-matched case-control study to identified exposure factors, and used conditional logistic regression to analyze the data. We estimated vaccine effectiveness and vaccination coverage.Results: We identified 81 cases (75 probable, 6 confirmed); 4 patients (4.9%) died. In the case-control study, 47% of case-patients and 2.3% of controls were hospitalized at Lyantonde Hospital pediatric department for non-measles conditions 7-21 days before case-patient’s onset (ORadj=34, 95%CI: 5.1-225). Estimated vaccine effectiveness was 95% (95%CI: 75-99%) and vaccination coverage was 76% (95%CI: 68-82%). During the outbreak, an “isolation” ward was established inside the general pediatric ward where there was mixing of both measles and non-measles patients. Conclusions: This outbreak was amplified by nosocomial transmission and facilitated by low vaccination coverage. We recommended moving the isolation ward outside of the building, supplemental vaccination, and vaccinating pediatric patients during measles outbreaks.

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Measles Outbreak Amplified in a Pediatric Ward: Lyantonde District, Uganda, August 2017

10.21203/rs.2.12738/v4 ◽

2020 ◽

Author(s):

Claire Biribawa ◽

Joselyn Annet Atuhairwe ◽

Lilian Bulage ◽

Denis Othuba Okethwangu ◽

Benon Kwesiga ◽

...

Keyword(s):

Vaccination Coverage ◽

Case Control Study ◽

Conditional Logistic Regression ◽

Case Control ◽

Vaccine Effectiveness ◽

Pediatric Ward ◽

Probable Case ◽

Measles Outbreak ◽

Isolation Ward ◽

Control Study

Abstract Background: Measles is a highly infectious viral disease. In August 2017, Lyantonde District, Uganda reported a measles outbreak to Uganda Ministry of Health. We investigated the outbreak to assess the scope, factors facilitating transmission, and recommend control measures.Methods: We defined a probable case as sudden onset of fever and generalized rash in a resident of Lyantonde, Lwengo, or Rakai Districts from 1 June-30 September 2017, plus ≥1 of the following: coryza, conjunctivitis, or cough. A confirmed case was a probable case with serum positivity of measles-specific IgM. We conducted a neighborhood- and age-matched case-control study to identified exposure factors, and used conditional logistic regression to analyze the data. We estimated vaccine effectiveness and vaccination coverage.Results: We identified 81 cases (75 probable, 6 confirmed); 4 patients (4.9%) died. In the case-control study, 47% of case-patients and 2.3% of controls were hospitalized at Lyantonde Hospital pediatric department for non-measles conditions 7-21 days before case-patient’s onset (ORadj=34, 95%CI: 5.1-225). Estimated vaccine effectiveness was 95% (95%CI: 75-99%) and vaccination coverage was 76% (95%CI: 68-82%). During the outbreak, an “isolation” ward was established inside the general pediatric ward where there was mixing of both measles and non-measles patients. Conclusions: This outbreak was amplified by nosocomial transmission and facilitated by low vaccination coverage. We recommended moving the isolation ward outside of the building, supplemental vaccination, and vaccinating pediatric patients during measles outbreaks.

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Evaluating the Effectiveness of Influenza Vaccine in People With At-Risk Medical Conditions: A Test-Negative Design Case-Control Study for the Seasonal Influenza Vaccine Effectiveness II (SIVE II) Project

SSRN Electronic Journal ◽

10.2139/ssrn.3716865 ◽

2020 ◽

Author(s):

Eleftheria Vasileiou ◽

Tanya Englishby ◽

Kimberley Kavanagh ◽

Chris Robertson ◽

Nazir Lone ◽

...

Keyword(s):

At Risk ◽

Influenza Vaccine ◽

Seasonal Influenza ◽

Case Control Study ◽

Case Control ◽

Vaccine Effectiveness ◽

Medical Conditions ◽

Seasonal Influenza Vaccine ◽

Design Case ◽

Control Study

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744. Effectiveness of 23-Valent Pneumococcal Polysaccharide Vaccine and Influenza Vaccine Against Pneumococcal Pneumonia Among Elderly Patients Aged 65 Years and Older in the Republic of Korea: A Case–Control Study

Open Forum Infectious Diseases ◽

10.1093/ofid/ofy210.751 ◽

2018 ◽

Vol 5 (suppl_1) ◽

pp. S267-S267

Author(s):

Jong Hun Kim ◽

Byung Chul Chun ◽

Joon Young Song ◽

Hyo Youl Kim ◽

In-Gyu Bae ◽

...

Keyword(s):

Elderly Patients ◽

Elderly Population ◽

Case Control Study ◽

The Elderly ◽

Case Control ◽

Polysaccharide Vaccine ◽

Vaccine Effectiveness ◽

Pneumococcal Polysaccharide Vaccine ◽

The Republic ◽

Control Study

Abstract Background The national immunization program (NIP) of annual influenza vaccination to the elderly population (≥65 years of age) in the Republic of Korea (ROK) has been implemented since 1987. Recently, the 23-valent pneumococcal polysaccharide vaccine (PPV23) through the NIP has been provided to the elderly population in the ROK since May 2013. The aim of this study was to assess PPV23 and influenza vaccine (IV) effectiveness in preventing pneumococcal pneumonia (PP) among elderly patients ≥65 years of age. Methods A case–control study using a hospital-based cohort was conducted. Cases of PP including bacteremic PP and nonbacteremic PP were collected from 14 hospitals in the pneumococcal diseases surveillance program from March 2013 to October 2015. Controls matched by age and sex in the same hospital were selected. Demographic, clinical information, and vaccination histories were collected. Previous immunization was categorized into “vaccinated” if a patient had received vaccines as follows: PPV23 (4 weeks to 5 years) and IV (2 weeks to 6 months) prior to the diagnosis of PP for case patients and prior to the hospital admission for control patients. Adjusted odds ratio (OR) was calculated, controlling for underlying medical conditions. Vaccine effectiveness was defined as (1 – OR) × 100. Results During the study period, a total of 661 cases (104 bacteremic PP cases and 557 nonbacteremic PP cases) and 661 controls were enrolled for analyses. For overall patients ≥65 years of age, there was no significant vaccine effectiveness against PP. For young elderly patients with 65–74 years, IV alone (1.2%, [95% confidence interval (CI) −95.3% to 50.0%]) and PPV23 alone (21.9%, [95% CI −39.0% to 56.1%]) were not effective. However, significant vaccine effectiveness of PPV23 plus IV against PP was noted (54.4%, [95% CI 6.9–77.7%], P = 0.031). For older elderly patients ≥75 years of age, no significant vaccine effectiveness was observed. Conclusion Our study indicates that PPV23 plus IV may be effective in preventing PP among young elderly patients with 65–74 years, suggesting additive benefits of influenza plus PPV23 vaccination. Further studies are required to confirm the persistent additive protective effectiveness. Disclosures All authors: No reported disclosures.

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