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By Helen Branswell
November 11, 2015
Brian Snyder/Reuters
The evidence, which is confounding some researchers, suggests that getting flu shots repeatedly can gradually reduce the effectiveness of the vaccines under some circumstances.
That finding is worrying public health officials in the US, who have been urging everyone to get a flu shot each year ? and who still believe an annual vaccination is better than skipping the vaccines altogether...
November 11, 2015
Brian Snyder/Reuters
The evidence, which is confounding some researchers, suggests that getting flu shots repeatedly can gradually reduce the effectiveness of the vaccines under some circumstances.
That finding is worrying public health officials in the US, who have been urging everyone to get a flu shot each year ? and who still believe an annual vaccination is better than skipping the vaccines altogether...