general or unspecified only: prefer specifics; in lower animals: Manual 22.20; relation to parasitic diseases: Manual 22.12-.20; parasites in food or parasitic contamination of food is indexed under FOOD PARASITOLOGY (IM) + specific parasite (IM) + specific food item /parasitol (IM) or (NIM)

Invertebrate organisms that live on or in another organism (the host), and benefit at the expense of the other. Traditionally excluded from definition of parasites are pathogenic BACTERIA; FUNGI; VIRUSES; and PLANTS; though they may live parasitically.

PARASITICIDES was heading 1963-66