A biology graduate student who recently visited a tropical region of Africa presents with new visual impairment and the sensation that something is moving in her eye. She tells you that she is concerned because she had been warned about eye disease transmitted by black flies. When in Africa, she was in a river area, and despite her best efforts she received a lot of black fly bites. She also has some subcutaneous nodules. If her infection was acquired by black fly bite, what is the most likely causative agent?
A) Ancylostoma braziliense B) Dracunculus medinensis C) Loa loa D) Onchocerca volvulus E) Wuchereria bancrofti
A woman who imports food from Mexico and spends several months per year in rural Mexico had to have a compound leg fracture pinned and set in Mexico and has returned 3 days later. She now has signs of acute appendicitis and is taken to surgery in Houston. When her appendix is removed, it is found to contain a light-colored, 20.5-cm-long roundworm as well as bile-stained, knobby eggs consistent with Ascaris. How did she acquire this infection?
A) Ingestion of water containing filariform larvae B) Skin penetration by filariform larvae C) Skin penetration by rhabditiform larvae D) Ingestion of food contaminated with the eggs E) Inhalation of dust carrying the cysts
A patient whose major source of protein is smoked and cooked fish develops what appears to be pernicious anemia. What parasite is noted for causing a look-alike vitamin B12 anemia in certain genetically predisposed infected individuals?
A) Echinococcus granulosus B) Diphyllobothrium latum C) Hymenolepis nana D) Dipylidium caninum E) Taenia solium