A rash is not a common symptom of the flu, but it can sometimes occur. Learn more about a flu rash and other possible causes of a rash here.

A new study reveals that delivering a flu vaccine using a new type of skin patch can stimulate an appropriate immune response without side effects in mice.

Pretreating the site of intradermal vaccination - vaccine delivered into the skin rather than to muscles beneath the skin - with a particular wavelength of laser light may substantially improve vaccine effectiveness without the adverse effects of chemical additives currently used to boost vaccine efficacy.