26 dic 1900 año - 26 December 1900: Robert Koch also finds out about acquired immunity to malaria, because he arrives as part of a German expedition in German New Guinea and examined the blood of many inhabitants and noticed they contained Plasmodium parasites, the cause of malaria, but their bouts of malaria were mild or could not even be noticed
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26 dic 1900 año
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~ 123 years ago
