Biology Quiz A Q1

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Malaria Biology Quiz A Q1 Following a mosquito bite the newly introduced malarial parasite will first enter the liver cells and replicate - only after this period of replication are they released into blood. In some species parasites may remain dormant in this liver stage (as a "hypnozoite"). Malaria parasites that form hypnozoites can re-emerge to cause a late or recurrent infection after weeks, months or perhaps longer, but this is a feature of only some species. In which species can late infection emerge from dormant parasites in liver? Make one or more selections P.falciparum P.vivax P.ovale P.malariae P.knowlesi Explanation of correct answer (click "Expand"). Short answer taken from section "Initial Infection in the Malaria Biology page" (see the section for full details and links). The hepatic stage is the period where parasites begin to replicate and cause infection - this corresponds to an incubation period before symptoms begin; this will typically last between 1-4 weeks, and during this time parasites will not be detected in blood. For two malaria species ( P.ovale and P.vivax ) the hepatic stage may lie dormant for a period of time - this is the hynozoite (“sleeping animal”). This hyponozoite may reactivate - typically in less than a year although occasionally longer, causing clinical malaria symptoms long after the initial infection. Go to next question (2 of 5)