muyembe had to contain ebola in kikwit, a city of almost 400,000. to stop the spread, traditional funeral rituals had to be discarded.an >> ( ated ): we didn't have coffins. we'd put them in trucks. we'd dig a hole and throw them in. that shocked people. >> reporter: in 2014, came the worsebola outbak in histor >> the ebola outbreak that started in the wesy african coun guinea has now spread. >> our people know nothing, there is no cure. >> reporter: without ati prevenve vaccine or a treatment, the virus spread across six west afcan countries even jumping to europe and the u.s. soka moses, a physician in liberia, recalls the sense of desperation. >> the patients are vomiting, bleeding, meanwhile, there werew still patientsting outside the gate. and they are begging. every time you go to the gate, they are begging to come in. this is a serious situation. >> reporter: in the end ebola infected over 28,000 people globally. more than 11,000 died. but that catastrophe also spawned a wave of scientific collaboration and discovery. today, as doctors strugg