Q. When does the flu season start for purposes of the seasonal flu vaccine
requirement? Since the seasonal flu vaccine is required, do I have to get
the seasonal flu vaccine if it is not the flu season?
A. For purposes of the immigration medical examination, the flu season
starts on October 1 and ends on March 31 each year. If your immigration
medical examination is during this period, you are required to have the
seasonal flu vaccine. If you have an immigration medical examination
completed between April 1 and September 30, when it is not the flu season
for immigration purposes, you are not required to document that you have
received the seasonal flu vaccine.