17. which method of the chain of infection that has an opening allowing the microorganisms to enter the host? a.method of transmission b. portal of entry c. portal of exit
18.some bacteria digest non living food materials such as milk and meat. what do you call these organisms? a.parasite b. rickettsia c. saprophytes
19. which parasitic worms that eggs usually enter the body through the anus, nose or mouth through inheald air of fingers that have touched a contaminated object?
a.pinworms b.roundworms c.tapeworms
20.it is type of worms that lives in the intestines and causes serious illness, also known as trichia spirallis?
