Flu vaccine for children linked to pneumonia risk for their relatives

The nasal flu vaccine that is often given to children causes a temporary rise in the number of pneumonia-causing bacteria in their noses, which they sometimes pass on to members of their household, a study has found. But this may not actually lead to more pneumonia cases among their relatives.

In fact, given that bacterial pneumonia in older people is often triggered by a bout of flu, vaccinating children…