Biology Questions and Answers

Biology Questions and Answers

an enteritis with diarrhea, abdominal
pain, weight loss and anemia.

20. What is trichomoniasis?
    Why is it classified as an STD?

Trichomoniasisprotozoan infection cause is an extra-intestinald by
Trichomonas vaginalis, a flagellate

protozoaurinary tractn. The parasite in of males and females. Infects the (^)
females it causes discharge, pain and
itching.
Trichomoniasis is an STD because its
main mode of transmission iscontact. sexual

21. What are the main
    manifestations of
    leishmaniasis?

There are two maileishmaniasis: cutaneous leishmaniasisn forms of (^)
and visceral leishmaas kala-azar). The form is determinedniasis (also known
by the species of infective leishmania
and by the immuhost. ne response of the

22. What is the etiological
    agent of cutaneous
    leishmaniasis? How is the
    disease transmitted and what
    are its typical manifestations?

The etiological agent of cutaneous
leishmaniasisLeishmania brazilie is the nsis.protozoan

The transmission, like in the visceral

form of the disease, issand fly Lutzomya (nam by the bite of theed after the

Brazilian scientist Adolfo Lutz), the

vector host. Cutadevelops in the bite site where theneous leshmaniasis

parasite establishes itself. The skin

wound has a reddish injury with evolcaniclevated borders. crater shape, a

From the primary lesions the parasites

can spread through the blood to affectother areas, mainly the mucosae of the (^)
nose, mouth and pharynx, causing facial
deformations.

23. What is the etiological
    agent of visceral
    leishmaniasis? How is the
    disease transmitted and what
    are its typical manifestations?
    Visceral leishmaniasis is caused by the
    protozoan Leishmania donovani.
    The transmission is similar to the

cutaneous leishmaniasis,sand flies. The affected organs ge by the bite ofnerally (^)
are the liver, the spleen and the bone
marrow. Thweight loss, splenomegaly (e patient often has fever,hypertrophy (^)
of the spleen), anemia and decreased
counts of leukocytes adisease may cause death.nd platelets. The
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