Congo’s Ebola outbreak began months before official declaration: WHOThe WHO said the fastest-growing Ebola outbreak on record in eastern Congo began in February, months before its May declaration. Confirmed cases of Ebola in this outbreak have reached 4,200, including over 1,900 deaths, according to the latest government figures. The outbreak declared on May 15 is unlike most previous ones for Ebola because the rare Bundibugyo virus responsible for it has no approved vaccines or treatments. Several past Ebola outbreaks have also been declared weeks or months late, including the 2014-2016 West Africa outbreak. That outbreak was declared in March 2014, although the first human case was later found to have occurred in December 2013.