What is one of the strains included in the flu vaccine?

The flu vaccine is designed to provide immunity against specific strains of the influenza virus, which are selected based on epidemiological data about which strains are most likely to circulate in the upcoming flu season. The World Health Organization and other health authorities typically recommend which strains to include based on global surveillance.

Phuket is recognized as a strain included in many flu vaccines because it has been identified as prevalent and significant in terms of public health. The decision to include a specific strain like Phuket in the vaccine formulation is based on its relevance in causing influenza outbreaks and its potential impact on population health.

The other named locations may not be recognized as strains included in the annual flu vaccination, as vaccine choices are informed by the most current viral circulation patterns and the strains that show the potential for infecting the population during the flu season. Thus, B, Phuket, is the correct choice, highlighting the importance of tracking flu strains to inform vaccine development effectively.