Red blood cells in which the malarial-fever parasite resides are eliminated from a person’s body after 120 days. Because the parasite cannot travel to a new generation of red blood cells, any fever that develops in a person more than 120 days after that person has moved to a malaria-free region is not due to the malarial parasite.
Which of the following, if true, most seriously weakens the conclusion above?
【选项】In any region infested with malaria-carrying mosquitoes, there are individuals who appear to be immune to malaria.
Which of the following, if true, most seriously weakens the conclusion above?
【选项】In any region infested with malaria-carrying mosquitoes, there are individuals who appear to be immune to malaria.
