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Chapter 26: Rickettsia and Related Genera

Morulae (intracellular inclusions in leukocytes) are characteristic of which of the following diseases?

(A) Malaria caused by Plasmodium falciparum infection but not Plasmodium malariae infection

(B) Dengue

(C) Babesia infection

(D) Ehrlichiae infection

(E) Loa loa

Which of the following statements about epidemic typhus (Rickettsia prowazekii disease) is most correct?

(A) The disease occurs primarily in sub-Saharan Africa.

(B) It is transmitted by ticks.

(C) Mice are the reservoir.

(D) Historically, the disease occurs in times of prosperity.

(E) Recrudescence can occur many years after the initial infection.

The most useful drug to treat ehrlichiosis is

(A) Doxycycline

(B) Penicillin G

(C) Trimethoprim–sulfamethoxazole

(D) Gentamicin

(E) Nitrofurantoin

A disease characterized by malaise, headache, rigors, and fever developed in members of several families living in an unheated war-damaged house in an Eastern European country. Erythematous 2–6 mm macular red rashes appeared on the peoples’ trunks and later on their extremities. Some of the people had coughs. One elderly person, although sick, was much less sick than other adults. The people huddled together to keep warm; body lice were common. Which of the following statements is most correct?

(A) The disease that these people had is common in the Rocky Mountain states.

(B) The elderly person may have had acute epidemic typhus many years ago and recrudescent typhus now.

(C) Fleas from rodents in the house were spreading Rickettsia typhi.

(D) The primary host of the body louse infecting the people is the rat.

(E) Epidemic typhus can be prevented by a vaccine.

Which of the following statements about Ehrlichiae and ehrlichiosis is most correct?

(A) Dogs and mice are reservoirs.

(B) Mosquitoes are the vectors.

(C) Ampicillin is the treatment of choice.

(D) Culture is ...

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