Flashcards in Virulence and pathogenicity of parasites Deck (43)
3 groups of eukaryotic organisms that aflict health and wellbeing of animals?
single celled, nucleated org that causes harm to health?
worm like animals showing differentiation, metazoans
3 sub classifications of helminths and short description
Cestode- tapeworm (flat words)
Trematode- fluke (flatworm)
Arachnids and insects, ectoparasites that afflict health and well being of animals?
Lives on the host, causes infestations?
Lives in the host, causes infection?
harbors adult or sexual stage of the parasite?
harbors larval or asexual stage of the parasite?
an unusual host, unnecessary for the maintenance of parasite in nature?
conferred by a host's specific immune response developed as a result of a previous parasitic infection?
resistance to reinfection or superinfection conferred by presence of parasites that are alive but are in check by host immunity-malaria, toxoplasmosis
Parasites have specificity for?
particular definitive and intermediate hosts
Often parasite life cycles can only be completed in?
a particular host
How can disease manifestations differ?
Depends upon whether an animal serves as a definitive, intermediate, or incidental host.
infection dose and the number of organisms acquired over time?
Ingestion cause of parasite infection?
Giardia, Balantidium coli, Toxoplasma gondii, Cryptosporidium, Cestodes, some Nematodes, some Trematodes
Skin or mucosal penetration cause of parasite infection?
Hookworm, Strongyloides stercoralis; schistosomes
Transplacental (prenatal) cause of parasite infection?
Toxoplasma gondii, Toxocara canis, Strongyloides stercoralis
Transmammary (milk) cause of parasite infection?
Toxocara canis, T. cati, Ancylosotma caninum
Arthropod bite (vector) cause of parasite infection?
Babesia, heartworm, Leishmania, Trypanosomes
Sexual contact: cause of parasite infection?
How does the parasites reproduce in protozoa?
Multiply in Hosts
How do helminths reproduce?
Adult worms do not multiply in the definitive host. Worms die over time, unless the host is re-exposed
The severity of the disease is proportional to worm load introduced into the host.
Attachment of parasites causes?
Cell and tissue damage
Different mechanical or biting mouthparts?
Ancylostoma tubaeforme have what kind of attachment?
3 pairs of teeth in buccal cavity
Adult hookworms in the small intestine of infected dogs or cats are attached to the intestinal villi by?
Large mouth cavity (buccal cavity)
-Adult hook worms can cause loss of .2 mL of blood per day
Taenia spp. scolex (T. solium and T. saginata) attach to this area in humans?