Micronucleus Macronucleus killers of humans through the ages. At least 300 million people in the world contract malaria each year, and 3 million die of it. Protozoan infections of animals are so common that it is difficult to estimate their extent or overestimate their economic importance. Some parts oftropical Africa are uninhabitable, due in large part to the presence of the tsetse fly, the carrier of the try-panosomes that cause African sleeping sickness. Humans have no natural defense mechanisms against this infection. Some animals, including cows and horses, are reservoirs for these organisms.
Some diseases caused by protozoa are given in table 12.2.
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