Parasite: part 1 Flashcards
Define infection
invasion by and growth of pathogenic microorganisms within the body
Define disease
a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors; illness; sickness; ailment.
Define parasite
organism living in or on the host and dependent on it for nutrition - causing damage
Distinguish types of parasite
Endoparasite: protazoa and metazoa. = parasites that live inside the body of the host Ectoparasite = parasites that live on the outer surface of the host and generally attach themselves during feeding
What is protozoa
single celled organisms Eukaryotes (genome within a nucleus, complex organelles in cytoplasm)
t/f pathogenesis of protozoa is constant
F
T/F protozoa infection is associated with eosinophilia
F
What can be a route of protozoa infection
Some have insect vectors (eg malaria)
Examples of protozoa
amoeba, coccidiae, ciliates, flagellates
What are metazoa
Multicellular organisms (Helminths/worms)
Differentiate the type of parasites that metazoa and protozoa are
Protozoa are often obligate intracellular parasites Metazoa are free living, not within cells
T/F all metazoa invade tissue
F. Some just inhabit gut (geohelminths), other invade tissues
T/F metazoa is associated with eosinophilia.
T Eosinophilia – if invade blood
2 types of amoeba. Which is dangerous How are you infected by these
Entamoeba histolytica (=INVASIVE) , Entamoeba dispa(=COMMENSAL) Infection occurs by ingestion of mature cysts in food or water, or on hands contaminatd by faeces
How common is amoeba infection and how deadly
10% of world infected with E.histolytica 3rd most common cause of parasitic death
