Journal
EPIDEMIOLOGY AND INFECTION
Volume 151, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0950268823000055
Keywords
Community outbreaks; public health
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Despite the COVID-19 pandemic, influenza remains a significant issue, especially in community settings where influenza outbreaks can be difficult to control and result in high attack rates. In April 2022, there was a large A(H3N2) influenza outbreak in the largest Italian drug-rehabilitation community, with 184 individuals experiencing influenza-like symptoms (attack rate of 26.2%); 56% of them had previously received the influenza vaccine. Sequence analyses revealed a genetic drift from the vaccine strain, which may have led to the observed lack of protection.
Despite the COVID-19 pandemic, influenza remains an important issue. Especially in community settings, influenza outbreaks can be difficult to control and can result in high attack rates. In April 2022, a large A(H3N2) influenza outbreak spread in the largest Italian drug-rehabilitation community. One hundred eighty-four individuals presented influenza-like symptoms (attack rate of 26.2%); 56% previously received the influenza vaccine. Sequence analyses highlighted a genetic drift from the vaccine strain, which may have caused the observed lack of protection.
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