On 2003, a certain virus threatens the abaca industry in the province.

"We'd like to know the code to a certain virus you wrote," he stated.

It fights eye infections that are caused by certain viruses.

Until very recently, a pregnant woman who was possibly infected with certain viruses or parasites had to make an almost impossible choice.

Airborne transmission has also been reported in connection with certain viruses.

They tell me even the microscopes ain't never yet got a good look at certain viruses.

Increased risk of bacteria infections and certain viruses, such as shingles.

For example, certain viruses live in the body and cause disease only when the defenses of the body wear down.

In a few cases, however, the origins may be traced to recent or ongoing infections, such as those caused by certain viruses.

Other scientists are looking into environmental triggers, including exposure to certain viruses.