From CDC website:
"Flu Vaccination Timing
The recommended timing of flu vaccination has not changed. September and October are the best times for most people to get vaccinated. Flu vaccination in July and August is not recommended for most people, but there are several considerations regarding vaccination in July and August for specific groups of people:
For adults (especially those 65 years old and older) and pregnant people in the first and second trimester, vaccination in July and August should be avoided unless it won’t be possible to vaccinate in September or October."
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