O-24 - The 1976 Yambuku Ebola outbreak had 318 cases and 280 deaths, index case five days after a hospital chloroquine injection
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observation
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O-24
statement
The first recognized Ebola outbreak comprised 318 cases and 280 deaths (case-fatality about 88%) between 1 September and 24 October 1976 in Bumba Zone, Zaire, within about 70 km of Yambuku Mission Hospital; the index case's symptom onset (1 September) came five days after he received a chloroquine injection at the hospital's outpatient clinic, and the disease was previously unknown to the region.
onset of symptoms on 1 September 1976, five days after receiving an injection of chloroquine for presumptive malaria at the outpatient clinic at Yambuku Mission Hospital