I could feel his strength in his words.

He believes in his knowledge power.

He has an astonishing amount of physical strength.

He believes in his own strength.

You always become my strength, thank you very much.

He is an expert in virology.

My computer got infected with a computer virus.

The poliovirus is a virus that primarily enters the body through the mouth and destroys the nervous system.

Norovirus can be prevented by hand washing and disinfection.

Please use the emergency stairs in case of a fire.