Push to double up on Covid booster and flu shot may have a downside, experts caution The protection from flu vaccines erodes pretty quickly over a flu season. A dose given in early September may offer limited protection by February or March. Helen Branswell STAT

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A number of studies have shown that the benefit of a flu shot wanes substantially over the course of a flu season — exacerbating effectiveness problems that are frequently seen when some of the strains in the vaccine aren’t well matched to the strains making people sick....

'Don't wait' to get the new Covid shot, White House says The White House is pushing Americans to get the updated Covid booster ahead of a potential fall surge of the virus. The new shots target the BA.5 omicron subvariant. YahooNews

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The plans include the acquisition of more than 170 million doses of the new boosters, which will be available to consumers without an out-of-pocket cost.

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Myocarditis from COVID-19 booster rare, but risk highest among teen boys, young men Cases of myocarditis – an inflammation of the heart muscle – following a third dose of the Pfizer vaccine are rare and typically mild, research from Israel shows. www.heart.org

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Pfizer isn’t sharing Covid vaccines with researchers for next-gen studies Researchers studying next-gen vaccines to fight an evolving Covid threat are running into problems getting existing vaccines to use in their research. Rachel Cohrs STAT

WASHINGTON — Researchers studying next-generation vaccines to fight an evolving Covid-19 threat are running into problems getting existing vaccines to use in their research.