That depends on the bacteria, the virus, and your definition of "living."
A parasite is any organism that lives on or in another organism, not necessarily a fungus, virus or bacteria.
A parasite is an organism that lives in or on another organism (the host) and benefits from the relationship at the expense of the host. Bacteria and viruses can both be parasites, depending on their interactions with the host organism.
a tapeworm is neither, it is a living organism which lives in the intestine. but if any, it COULD be classed as a virus.
Probably until the person who had the virus is cured. But you never know how long bacteria can last.
Bacteria and virus
Smallpox was a virus.
virus
a bacteria. the bacteria that causes pneumonia is called pneumoniae.
Bacteria Virus
Medicines no longer work after using it consistently because, eventually, the bacteria or virus causing the sickness will gain an immunity to it.
Virus
Virus