Nasal influenza vaccines, which are offered to children in many parts of the world, contain a live, attenuated virus.
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The nasal flu vaccine commonly given to children can temporarily increase the number of pneumonia-causing bacteria in children's noses, which can then be passed on to other family members, a study has found. However, this may not actually lead to an increase in pneumonia cases among their relatives.
In fact, given that bacterial pneumonia in the elderly is often caused by a bout of influenza, it is necessary to vaccinate children…
Source: www.newscientist.com
