Ebolas Zaire, Sudan, and Tai cause illness in humans as well as primates (monkeys). Ebola Reston does not cause illness in humans, but does cause illness in monkeys. Ebola Reston is suspected to be airborne (transmitted by the air) where the other strains are not transmitted by air. As for their structure, they are all quite similar in (string-like) shape, but have different gene sequences in places, and therefore different properties.
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