In fact, the most common type of T. gondii found to be infecting otters off the California coast is the Type X strain (Conrad et al., 2005), which has yet to be traced to domestic cats (Miller et al., 2008).

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One strain was a type that, in any circumstances, only breeds in mammals, not insects.

ECONOMIST: Recruiting mosquitoes to fight malaria

Though the need for glasses will be impossible to resist in most people, reading in good light and using clear type will help reduce the strain on the eyes.

BBC: Eyesight: The effect of age

Swine flu is a respiratory disease which is caused by a strain of the influenza type A virus known as H1N1.

BBC: India swine flu outbreak 'kills 94'

They believe that the Lister strain may be ineffective against the type of smallpox likely to be used in a terrorist strike.

BBC: Q&A: Smallpox vaccine

It is only the fourth time European Bat Lyssavirus type -2 (EBLV2), which is a strain of rabies, has been discovered in bats in the UK - all were Daubenton's bats.

BBC: NEWS | UK | England | Manchester | Health warning over 'rabid' bats

The researchers took a strain of rat which is known to suffer from a specific type of tumour.

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It said a strain of polio (WPV1) found in China was genetically linked with the type now circulating in Pakistan.

BBC: Polio strain spreads to China from Pakistan

Swine flu is caused by a virus similar to the type of flu virus that, in various forms, infects people every year, but is a strain typically found only in pigs -- or in people who have direct contact with pigs.

CNN: Among the swine flu mysteries: Why only deaths in Mexico?