A virus can infect a parasite:

https://schaechter.asmblog.org/schaechter/2011/07/viruses-that-infect-parasites-that-infect-us-the-matryoshka-dolls-of-human-pathogens.html

Disinfectants kill covid19?

https://cen.acs.org/biological-chemistry/infectious-disease/How-we-know-disinfectants-should-kill-the-COVID-19-coronavirus/98/web/2020/03