Chickenpox Outbreak Investigation in Assabain District, Sana’a City, Yemen, January to February 2019
Bibliographic record
Abstract
Background Varicella zoster virus (VZV) causes chickenpox. The epidemiological profile of chickenpox varies considerably across countries, health care systems, and immunization policies. In Yemen, chickenpox remains an important public health issue and outbreaks are not uncommon since vaccination is not universal. On February 23, 2019, a medical doctor from the Al Kafji area of the Assabain district notified the Ministry of Public Health and Population of a chickenpox infection among his family members and neighbors. Objective The aim of this study was to confirm the existence of a chickenpox outbreak, describe the epidemiological characteristics of the outbreak, and recommend prevention and control measures. Methods A door-to-door search was performed for case finding and line listing with detailed epidemiological, clinical, and vaccination history collected. Four blood samples were collected and sent for laboratory confirmation by enzyme-linked immunosorbent assay. Data were analyzed with Epi info 7.2. Results A total of 26 cases met the case definition. The outbreak started on January 19, 2019, at one house and was then transmitted to the 2nd and 3rd neighboring houses. The Epi curve showed three peaks, with one peak for each affected house. The index case was an 11-year-old male. The overall attack rate was 34% and the highest attack rate of 56% was found in the 3rd house. More than half (58%) of cases were females and 46% were found in children in the age group of 10-14 years. All cases included symptoms of a rash with itching, 46% of cases had vesicular lesions, and 42% had <50 lesions. Overall, 8% of the cases had complications (ie, pneumonia). Approximately 25% of samples were IgM-positive. All cases were in unvaccinated individuals. Conclusions A chickenpox outbreak in the Al Kafji area of the Assabain district was confirmed. Females were more affected than males. Introducing the chickenpox vaccine as part of routine immunizations, and increasing community awareness about the mode of transmission and control measures for prevention are recommended.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".