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Author Question: Which of the following decreases the ability of malaria species to infect RBCs? a. Duffy-positive ... (Read 23 times)

chads108

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on: Jun 25, 2018
Which of the following decreases the ability of malaria species to infect RBCs?
 
  a. Duffy-positive phenotype
  b. Heterozygosity for hemoglobin S (Hb S)
  c. Hereditary spherocytosis
  d. Rh-negative genotype

Question 2

A patient has crescent- or banana-shaped malarial gametocytes. Which of the following is probably true regarding the species of malaria and its clinical course?
 
  a. Plasmodium malariae, which is benign and needs no treatment
  b. Plasmodium ovale, which is found mostly in Southern United States and is usually fatal
  c. Plasmodium falciparum, which is the most clinically serious
  d. Plasmodium vivax, which is the most clinically serious


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Hdosisshsbshs

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Heterozygosity for Hb S decreases the ability of malaria species to infect RBCs so infected individuals do not develop severe complications. RBCs lacking the Duffy phenotype are not vulnerable to malaria. Neither the Rh-negative genotype nor hereditary spherocytosis provides protection from infection with malaria.

Answer to Question 2

ANS: C
Plasmodium falciparum has crescent- or banana-shaped gametocytes. This is the most clinically serious form of malaria.


chads108

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Reply 2 on: Jun 25, 2018
Thanks for the timely response, appreciate it

nguyenhoanhat

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Reply 3 on: Yesterday
Excellent

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