Vaccine Complication — Worldwide/Unknown
A new study sounds a cautionary note for work that is being done to try to develop vaccines to protect against all subtypes of influenza. The research describes a phenomenon in which vaccination against one strain of flu actually seems to raise the risk of severe infection following exposure to a related but different strain, an effect called vaccine-associated enhanced respiratory disease. The scientists say it’s not currently known why the effect happens. Nor is it clear that it would be
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