Which of the following cysts has a nucleus with a prominent karyosome, a clear halo, no achromatic granules, and no peripheral chromatin?

Name the species of malaria parasite that usually produces a mature schizont with 8 or 10 merozoites in a rosette, or irregular cluster ( daisy-head appearance), that practically fills a normal-sized RBC.

Which organism is transmitted to humans by ticks and blood transfusions?

This parasite is transmitted by the tsetse fly:

Babesia is an organism that has easily been confused with

A 72-year-old man from Texas developed fever and weakness 16 days after a hunting trip in northwest Tanzania. Several days after the onset of fever, he noticed a raised, tender, erythematous nodule (6-8 cm in diameter) on the posterior aspect of his right arm. He was hospitalized in Africa and treated for 5 days with a cephalosporin for presumed cellulitis. After little improvement, he returned to Texas. On arrival, the patient had a temperature of 102°F, a morbilliform rash of the trunk, and right-sided, anterior cervical lymphadenopathy. CSF contained 12 RBCs and 18 mononuclear cells/mm3, with a normal protein level (32 mg/dL). Laboratory tests revealed a hemoglobin level of 10.7 g/dL, a WBC count of 2.4 X 103/uL). The diagnosis was made by finding the extracellular flagellate parasite in a peripheral blood smear. Which of the following is the most probable etiologic agent of the infection?

Name the Plasmodium sp. that causes benign tertian malaria; Duffy-negative individuals are not affected by this type of malaria; most common species that causes malaria.

Pregnant women are advised to avoid cleaning litter boxes of their house cats until after delivery to prevent congenital infection of

Name the Plasmodium sp. that causes mildest form of malaria; rarest species of malaria; comet forms are common.

These trophozoites are sluggish and have trashy cytoplasm: