The phrase "virus affects" is correct and usable in written English.
You can use it when you are describing how a virus has an effect or impact on something. For example: "The virus affects the immune system, causing severe symptoms in patients."
"We have no idea how this virus affects ducks, sparrows, swallows or other birds.
The virus affects the fish's skin and kidneys, which control its water balance.
The virus affects stone-fruit trees, including peaches, plums and apricots.
Like most rogue programs, this latest virus affects computers running versions of Microsoft operating systems.
"If a virus affects only one rare species of animal and that animal becomes extinct, the virus becomes extinct with it," he said.
The news is all the more distressing because the virus affects children and young adults far more powerfully than it does older people.
How did it become a human virus as opposed to a virus affecting animals?
Government scientists themselves said that last year the virus affected two millions pigs and killed 400,000.
Early this year, a virus affected a computer system at FirstEnergy's Davis-Besse nuclear power plant, but environmental groups say the computers were not linked to reactor operations.
Using all available resources, each group begins by answering the following questions about their virus (written on the board for easier student access): –What operating systems does this virus affect?
Recent outbreaks of the West Nile virus affecting horses in the eastern United States and France forced the cancellation yesterday of the world singles driving championship scheduled for the United States Equestrian Team Training Center in Gladstone, N.J., Oct. 18 to 22.
