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dIndividuals were considered vaccinated if their vaccination date was ≥14 days.
The children's vaccinating centers provided data on birth date, vaccination date, and whether the vaccine was PCV7 or PCV13.
Furthermore, we considered all vaccinated cases with unknown vaccination date to be unexposed to yield the maximum VE.
Respectively 49%and31%1% of the vaccinated cases with unknown vaccination date were assumed to be exposed using 7 days or 14 days as cut off for the validity of vaccination (extrapolation from cases with known date of vaccination).
2) As a first sensitivity analysis, influenza cases with missing vaccination date are treated as vaccinated.
Information on 2010 2011 influenza vaccination (date and brand of vaccine) was verified by contacting patients' general practitioners (GPs) by telephone.
Similar(19)
Further comparison of these 18 pairs of written immunization history showed that 11 certificates recorded more vaccine doses than the paired cards, and the other seven pairs recorded same vaccine doses but different vaccination dates.
He found no relation between the children's vaccination dates and the onset of their disease.
And starting in 2016, a new electronic medical record system will make it easier for UC students to enter their vaccination dates and information.
We would like to thank Marcia Lopes de Carvalho, from the Coordination of Surveillance of the Diseases of Respiratory Transmission and Inmunopreventable (Ministry of Health, Brazil) for providing us with the data on historic vaccination dates.
9 Unknown vaccination dates were categorised separately.
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