Enos being prepared for insertion into the Mercury-Atlas 5 capsule in 1961. Enos (d. November 4, 1962) was the 2nd chimp launched into space and the first chimp to achieve Earth orbit. Enos' flight occurred on November 29, 1961. His training was more intense for him than for his predecessor Ham, because Enos was exposed to weightlessness and higher gs for longer periods of time. His training included psychomotor instruction and aircraft flights. Enos died of shigellosis-related dysentery, which was resistant to then-known antibiotics. Pathologists reported no symptoms that could be attributed or related to his space flight.