In The Gambia, every newborn is given a health card where EPI vaccinations and dates of administration of the vaccines are recorded by immunization officers.
Figure 4 reports the distribution of immunised subjects by interval between date of vaccination and date of death (during the 45 days following vaccination).
§Rates are percentages of all pregnancies with miscarriage in specified interval of gestational age. Figure 2 shows the counts of miscarriages and pregnancies and the rates by arm according to the time between nearest vaccination and date of estimated conception.
Type of vaccine and date of vaccination were ascertained from medical records and patient report.
Additional data on the patient's age, sex, date of symptom(s) onset, whether vaccinated and date of vaccination were collected on the test request form.
Information on vaccination status and date of vaccination were extracted using algorithms based on ICPC code and open text fields including brands and batch-code.
Overall, optimizing the completeness of the data regarding hospitalization status, vaccination status, and date of vaccination as well as additional information on comorbidities could improve the validity of our VE estimates.
We calculated the days between dates of each vaccination and dates of estimated conception; we used dates of first vaccination dose, most recent vaccination dose before the estimated conception date, and vaccination dose nearest to (whether before or after) the estimated conception dates as three different origins of time scales.
This surveillance includes the systematic collection of throat swab specimens and clinical data (including but not limited to gender, date of birth, symptoms, influenza vaccination status, type of vaccine received, and date of vaccination) from consenting US military trainees meeting the case definition for febrile respiratory illness (oral temperature ≥100.5°F [38.0°C] and a cough or sore throat).
These data included information on enrollment, refusal status, vaccinations received, and dates of vaccine receipt.
