Transmission of amebas; Sporozoa; Hemosporidians Flashcards
Entamoeba histolytica
Trophozoites in large intestine begin encystment in firming stools
Trophozoite form found in stool of dysentery patients; cyst in semisolid stools; metacyst in formed stools
Metacysts infective to new host
Naegleria fowleri
transmitted through water entering nasal passages (especially hot pools, or stagnant water in the summer)
Toxoplasma gondii
Transplacental - ̴3500 congenitally infected babies/year – U.S. – early embryonic death, stillbirth, retardation, blindness, etc.
Cryptosporidium sp
Fecal-oral contamination
Municipal water supplies
Swimming pools – chlorination doesn’t kill
Sarcocystis sp.
FH infected by eating tissue cyst in herbivores (very prevalent) – herbivores infected by ingesting sporocysts from carnivore feces.
Plasmodium sp.
Stages in RBCs/hepatocytes of vertebrate transmitted to mosquito during blood meal development in mosquito to vertebrate during feeding
Babesia bigemina
tick, Boophilus annulatus – very host specific 1-host tick; transovarian transmission of B. bigemina occurs