Which of the following diseases is caused by a protozoan?

(A)

Blastomycosis

(B)

Syphilis

(C)

Influenza

(D)

Babesiosis

NEET - Medical UG-2015 Medium

Answer & Solution:

The correct answer is (d) Babesiosis.

Babesia is an intraerythrocytic protozoa of animals, causes tick born malaria like illness in cattle and sheep. It rarely affects humans causing opportunistic infection. The first human case was reported in 1957 in a farmer in Yugoslavia. Babesia species are grouped into: 1) Small Babesia species (1–2.5 µm):B. microti, B. gibsoni and B. rodhaini 2) Large Babesia species (2.5 5 µm) B. divergens and B. bovis. The nymph stage of the deer tick Ixodes scapularis is the primary vector (definitive host) of the parasite. Occasionally it is transmitted by blood transfusion. Humans act as intermediate host. Man acquires infection by the bite of ticks where the sporozoites enter through the site of bite and are discharged into circulation.

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