1 week ago

What to Know About October’s Seasonal Flu Vaccine

H1N1, sometimes called swine flu, is now one of the viruses that can cause seasonal flu.

Flu vaccines are made to protect against the viruses expected to spread each season.

The vaccine is changed regularly because flu viruses can change.

People usually need a flu shot every year because protection can weaken and the viruses may be different.

September or October is often a good time to get vaccinated in the Northern Hemisphere.

The body usually takes about two weeks to build protection after the shot.

You can still get the flu after vaccination, but the illness may be less serious.

Older adults, children, pregnant women, and people with certain health problems should take vaccination especially seriously.

Key facts

H1N1 status: H1N1, commonly called swine flu, is now part of the seasonal influenza viruses circulating among people.
2026–27 vaccine component: WHO recommended an updated H1N1 component based on an A/Missouri/11/2025 (H1N1)pdm09-like virus.
Typical vaccination timing: September and October are generally good months for seasonal influenza vaccination in the Northern Hemisphere.
Protection timeline: The immune system generally needs about two weeks to develop a protective response after vaccination.
Annual vaccination: Yearly vaccination is recommended because influenza viruses change and immunity can decrease over time.
Possible reactions: Temporary soreness, tiredness, headache, mild fever, or muscle aches may occur after vaccination.
Vaccination limits: No influenza vaccine provides 100% protection against every infection, but vaccination can reduce the risk of serious disease and complications.

indianexpress.com · 1 week ago