The vaccine also provides some cross-protection against the 1918 flu pandemic strain.

Officials have said the vaccine should still provide at least partial protection, but that is not known for sure.

Whichever you choose, either vaccine can provide powerful protection for your college freshman.

Existing vaccines against seasonal flu provide no protection.

This year's vaccine included a strain similar to the A-Shanghai and should provide protection against it.

The vaccine acts by stimulating the innate immune response and provides long term protection against the disease.

Few vaccines provide complete protection - you should still take care with food, drink and personal hygiene.

The vaccine protects against the virus in more than 95% of cases and provides protection from the virus for at least fifteen years.

Like any vaccine, the typhoid vaccine may not provide protection from disease in every person.

But, the vaccine does not provide substantial protection against the more virulent forms of TB found among adults.