It was previously thought that vaccination provided lifelong protection against specific strains.

Get yourself (or family members age 6 months and older) vaccinated against current strains of influenza, if possible.

Some were active against strains of organisms which had become resistant to older antibiotics.

Will the same type of vaccine work against other strains of norovirus?

Second, research must be continued to make the vaccine effective against additional strains of the bacteria.

So, the authors said, consistent condom use may protect women against other dangerous strains of the virus.

Ministers decided to buy so much because vaccines cannot be made quickly enough to protect populations against emerging strains.

Different antibiotics are effective against different strains of the bacteria.

This needs to be done each autumn to protect against current strains.

They are seen as a possible therapy against multi-drug-resistant strains of many bacteria.