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Flu vaccination during pregnancy may cut a woman's chance of hospitalization by 40%.
Influenza illnesses can trigger asthmatic episodes that don't respond to treatment.
Protection against the H3N2 strain was 17%—and not statistically significant.
The risk of heart attack increases sixfold in the first 7 days after lab-confirmed flu in adults 35 and older.
Flu hospitalizations are also on the rise, with the highest levels in seniors, a pattern often seen in H3N2-dominant seasons.
Viral changes, birth year, repeat vaccinations, and waning protection may all play a role.
Experts ponder why FluMist performed poorly in the US but well elsewhere.
Getting a flu shot 2 years in a row apparently can, under certain circumstances, backfire.
Those vaccinated 3 years in a row appeared to fare the worst in 2014-15 against H3N2 flu, but experts say it's still beneficial to get a flu shot each year.
Researchers in both places found vaccine effectiveness to be well below the already-low US numbers.
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CIDRAP - Center for Infectious Disease Research and PolicyOffice of the Vice President for Research, University of Minnesota, Minneapolis, MN
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