Example of Protozoan Diseases


  • Amoebiasis (Amoebic dysentery):  caused by Entamoeba histolytica. The infection is by the cysts Entamoeba in the stool of infected person through the agency of houseflies; The parasites pass into blood stream and enter various body organs (liver, spleen, lungs and   brain); It is characterized by abdominal pain, mild diarrhoea alternating with constipation, passing out mucus.

Entamoeba histolytica
  • African sleeping sickness: Caused by Trypanosoma gambiense. Trypanosomes are parasitic protozoans. They inhabit blood and lymph spaces or tissues of their hosts. They are pathogenic to man and domestic animals. It causes a fatal disease known as African sleeping sickness. In the late stage of Infection Trypanosomes migrate to the cerebrospinal fluid of the host manifesting nervous disorders. 
  • Kala azar (Leishmaniasis): caused by Leishmania donovani through the bite of the sand fly Phlebotomus; In man, L donovani lives intercellularly in leucocytes or cells of liver, spleen, bone marrow, lymphatic glands; Early symptoms are swelling, enlargement of spleen and liver, followed by weakness, anemia, peculiar darkening of skin.
  • Malaria: caused by digenetic (having two hosts to complete i.e., human and Anopheles mosquito) and tribasic (having three phases of life cycle) protozoan parasite, Plasmodium; The infective stage of parasite in human being is sporozoite. Symptoms: It is characterized by fever at intervals, sudden acute chilliness accompanied by shivering, profuse seating. Drugs like chloroquine and primaquine are administered to treat malaria.
Related Posts Plugin for WordPress, Blogger...

Follow by Email

 
2017 ExamplesOf.net | Biology Quizzes - QuizBiology.com Our Partners Biology Exams 4 U, Major Differences, MCQ Biology