No oovoo can not cause viruses.
Parasites can carry and transmit viruses, but they do not "cause" them.
Some can cause cancer. They are called oncogenic viruses.
While most viruses co-exist harmlessly in their host and cause no signs or symptoms of disease, many of the viruses do cause fever.
No, Clubpenguin is a safe site run by Disney that does not cause viruses.
Viruses can affect animals, and some viruses can affect plants.
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No.
No
no
No i always play on it and it never did download viruses
Yes, many viruses cause disease.