Parasitology Flashcards
Mention 2 protozoa that are susceptible to metronidazol!
Entamoeba histolytica Giardia lamblia Trichomonas vaginalis
What are the 3 modes of transmission for human Toxoplasma gondii infection?
Eating undercooked meat containing tissue cysts,
Contact with cat feces or consuming food or water containing oocysts Transplacental transmission
Which protozoon may infect the human foetus transplacentally and cause developmental malformations?
Toxoplasma gondii
Which species are the causative agents of malaria?
Plasmodium vivax, P. ovale, P. malariae, P. falciparum, (P. knowlesi)
What is the definitive (ultimate) host of Plasmodium species?
female Anopheles mosquito
What is the laboratory diagnosis of malaria?
Giemsa-stained blood smears. Thick smear is used to screen for the agent, thin smear is used to identify the species.
How long is the erytrocytic cycle of Plasmodium vivax and P. ovale?
48 hours
How long is the erytrocytic cycle of Plasmodium malariae?
72 hours
What is the causative agent of malignant malaria?
Plasmodium falciparum
Which Plasmodium species may cause relapse of malaria due to presence of hypnozoites?
Plasmodium vivax, P. ovale
Mention a potentially fatal complication of Plasmodium falciparum infections!
cerebral malaria
Mention an agent that may be effective in the treatment of acute malaria attack!
chloroquine, quinine, artemether+lumefantrine, etc.
Mention an antimalarial drug active against hypnozoites!
Primaquin
How can one diagnose the African sleeping sickness disease?
Giemsa-stained blood smears are used for direct demonstration. Serology may be helpful
What are the causative agents of African sleeping sickness?
Trypanosoma brucei gambiense and rhodesiense
Specify the 3 forms of leishmaniasis!
cutaneous, mucocutaneous and visceral