A virus is many times smaller than either an amoeba or a bacteria. Perhaps thousands would fit into a bacterial cell.
Virus
bacteria fungi virus amoeba and many other microorganisms
Giardia is neither a bacteria or a virus, it is a protozoan parasite.
Amoeba, Paramecium, Blue-green algae, virus etc.
Not intentionally, for when they do - the virus eats them.
virus
Bacteria.
Amoeba is not a bacteria. It comes in animal kigdom. It is unicellular organism. Such organisms are called as protozoa. It has no cell wall like bacteria do.
Bacteria or amoeba
A virus that infects bacteria is called a bacteriophage
Bacteria and virus
Bacteriophage is the virus that infects bacteria