Iran's terrorism was especially virulent as it appeared under the control of government ministries in Tehran.

Hospital officials were quoted originally as saying it was an especially virulent strain of bacteria.

But they say brain cancer merits attention as an especially virulent disease for which there often is no treatment.

The locusts continued to be a problem in the following years, and were especially virulent in 1687.

Cancer is essentially just a local explosion of the aging process, in an especially virulent form.

Their crews are ill with an especially virulent chaos plague.

"Cross burning is an especially virulent, even unique, form of intimidation in American society" that states should be able to prohibit, the brief said.

He was especially virulent when it came to the Presbyterians.

Fusarium is especially virulent on plants that dominate a landscape, he said.

In 2010, it had 107 cases of an especially virulent form of the disease that can cause seizures, nerve damage, and even death.