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Put the following steps of Koch's postulates in order: a. The suspected infectious agent must be isolated and grown outside the host. b. The suspected infectious agent causes the disease when it is introduced to a healthy, experimental host. c. The suspected infectious agent must be found in every case of the disease.
Continuous observation of the process of invasion into hosts by T. gondii by electron microscopy showed that the invasion of host cells by T. gondii is not similar to that of other intracellular pathogens that require making full use of the phagocytosis function of host cells for invasion.