Immunization · Influenza
Flu Vaccine (Influenza)
The flu is a contagious respiratory illness that can range from a miserable week to a serious, even life-threatening infection. A yearly vaccine is the best protection.
It’s recommended every year because flu viruses change and immunity fades over time.
The Basics
Influenza spreads easily and peaks in fall and winter. Most people recover in a week or so, but flu can cause pneumonia and dangerous complications, especially in older adults, young children, pregnant people, and those with chronic conditions. The vaccine greatly lowers the chance of getting the flu and, if you do catch it, of getting seriously ill.
Who & When
The ACIP recommends an annual flu vaccine for everyone 6 months and older, with rare exceptions. Aim to get it by the end of October, though later is still worthwhile through the season. It’s especially important if you’re 65 or older, pregnant, or living with a chronic condition.
The bottom line: a flu shot every year, ideally by late October.
Options for Older Adults
Adults 65 and older are preferentially given a higher-dose or adjuvanted flu vaccine, which produces a stronger immune response for aging immune systems. For others, a standard shot is used, and a nasal-spray version is an option for some healthy, non-pregnant people. We’ll pick what fits you.
Is It Safe?
Yes. The flu shot cannot give you the flu, it doesn’t contain a live virus that can cause illness. Common effects are a sore arm and sometimes a day of mild aches or low fever as your immune system responds. It’s recommended and safe in pregnancy, which also protects the newborn.
Common Questions
Do I really need it every year?
Yes. The viruses circulating change from season to season, and protection wanes over months, so last year’s shot won’t reliably cover this year.
I got the flu after my shot once.
The vaccine takes about two weeks to work, and it doesn’t cover every virus, but it makes illness far less likely and much milder if it does happen.
Useful Links
Talk it through with Dr. Mui
Ready for this year’s flu shot? Book a visit or ask us at your next appointment.
Prefer to ask first? Text Dr. Mui at 617-675-4085.
This page is for general education and isn’t a substitute for professional medical advice, diagnosis, or treatment. Screening guidelines change over time and the right plan depends on your personal risk. Always talk with a qualified health provider about your specific situation.