While peak flu season typically begins in December and ends in February, the best time to get your flu vaccine is in September and October.
However, the Centers for Disease Control and Prevention has updated some of its guidelines, mostly regarding egg allergies.
Most flu vaccines contain small amounts of egg protein, which is introduced during the vaccine-manufacturing process. Previously, those who suffered from severe egg allergies could get vaccines with “additional safety measures” — but now those extra measures aren’t necessary.