Annual vaccination against influenza A and B viruses is recommended for everyone ≥6 months old without a contraindication.1 Available vaccines for the 2019-2020 season are listed in the Table.
In the US, influenza vaccine should be offered by the end of October and continue to be offered for as long as influenza is circulating in the community. In most adults, serum antibody levels peak about two weeks after vaccination.1 Early vaccination (ie, in July or August) may result in suboptimal immunity before the end of the influenza season, especially in older adults. Children who require 2 doses should receive the first dose as early as possible, so that the second dose can be given by the end of October.
Influenza Vaccine for 2019-2020. JAMA. 2020;323(1):84–85. doi:10.1001/jama.2019.18016
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