As if a different strain could appear in a month's time.

It would be a different strain, but this was the best she could do.

Perhaps because within her veins ran a different strain of blood?

The common cold virus, with more than 100 different strains, is a leading member of this family.

It doesn't change the fact that Windows has 140,000 different strains of viruses.

We see it every year, but there are many different strains.

The two studies being published today are very similar to one another, except that they involved different strains of mice.

A new, very different strain of music came over the loudspeakers.

Some historians believe that the two are different strains of the same breed.

Two very different strains had gone to our making.