Eli5; how we find “patient zero” when there is disease outbreak? (Like how they found who started the ebola outbreak in 2014)

Question

Eli5; how we find “patient zero” when there is disease outbreak? (Like how they found who started the ebola outbreak in 2014)

In: 5171

Answer 1

Gaëtan Dugas was alleged to have been patient zero and basically blamed for AIDS outbreak in the USA. This was later debunked