Collocations for parasite - noun

common
dangerous, deadly
These flies carry a dangerous parasite.

external, internal
human
intestinal
malaria

carry, have
pick up
Pets do sometimes pick up intestinal parasites.

transmit
Your contaminated fingers can transmit the parasite to many surfaces.

be found in
the most common intestinal parasite found in humans

kill

infect sb/sth
cause sth
the parasite that causes malaria