Flu myth busted: Vaccine effectiveness unchanged with annual jabs

The findings support recommendations for vaccinating children annually

Researchers have put to rest the notion that having an annual flu shot may diminish the effectiveness of the vaccine from year to year in children.

Some earlier studies had reported negative effects associated with repeated flu vaccines, the US authors say.

However, their current research shows that vaccine effectiveness is unaffected by whether or not a child has been vaccinated in prior seasons.

The researchers say their findings support recommendations for an annual flu shot for children, which is now free for those aged between six months and four years in NSW, Victoria, Queensland, Tasmania, ACT and WA.

“Influenza vaccine’s effectiveness varied by influenza type and subtype and vaccine type, but prior-season vaccination was not associated with reduced vaccine effectiveness,” the researchers said.

“These findings support current recommendations for annual influenza

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