Many viruses do not deactivate under 165°F. SARS-COV-2 does not deactivate until at least 133°F. A high-grade fever (102°F – 109.6°F) does not approach the temperatures required to deactivate a virus.

There is anecdotal evidence that a low-grade fever (<102°F) is beneficial to the immune response, but do not expect your body to start incinerating viruses.

P.S. If you are inclined to use the Latin plural, it is vira, not viri.