General Parasitology and Protozoa
Amebas in humans are found in the oral cavity and the intestinal tract. Which one of the following statements best describes these intestinal amebas?
|A||Infection with E. Histolytica is limited to the intestinal tract|
|B||They are usually nonpathogenic|
|C||They are usually transmitted as trophozoites|
|D||They can cause peritonitis|
a. Many non-pathogenic amebae are present in the intestinal tract.
b. Infection with E. Histolytica is not limited to the intestinal tract and can cause extra-intestinal disease like amoebic liver abscess.
c. When the organism invades the blood stream through the colon wall it often lodges in the liver where it continues to multiply. The liver reacts and creates an inflammatory wall around the organisms leading to abscess formation.
d. Amebae are transmitted by cysts.