Owl (Aotus sp.) and squirrel (Saimiri sp.) monkeys are used frequently in malaria vaccine trials, during which the animals are monitored daily for parasitemia and general well-being. Every 2 weeks, blood samples are taken, and hematology and chemistries are performed. We examined 97 cases of malarial infection in owl and squirrel monkeys, whose parasitemia increased by. 22,000 parasites/uL daily during a 14-day interval. After malaria challenge, unprotected animals had significant changes in hematologic values. These changes could not be completely attributed to the increase in the parasite counts.
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