Vax strategy may protect against pandemics

Most flu vaccines are of limited use because they prompt a response to the “head” of the flu - an area that varies widely between different strains of the virus.

A better approach, say US scientists, is to infect people with strains that are less closely related to circulating flu, because this prompts the body to attack the “tail end” of the virus – an area that varies little among different viral strains.

More specifically, their study involving 78