But they may get reverted to the virulent form and cause the disease.

But now it's back, like a pandemic returning in more virulent form.

There also are very virulent forms of infection in hospitals.

Here we have Paganism rampant and in its most virulent form.

But the particularly virulent form that swept across the East like a black death, that one is probably no longer around.

He is a young man who was searching for truth and walked into a virulent form of fundamentalist Islam.

Society must recognize that economic and social injustice are a virulent form of pollution.

Me, I've got the most virulent form of the malady.

Every virulent form of infectious death stalked through the land.

The doctor visited a patient who had just suddenly come down with a virulent form.