We think of HIV, TB and malaria as some of the deadliest infectious diseases on earth. And the death tolls bear that out.
But there's a family of viruses that is in the same league: hepatitis viruses.
There are five of them. Their alphabet soup of names tells us the order in which they were discovered: hepatitis A, B, C, D and E. According to a new report from the Global Burden of Disease, the viruses kill 1.34 million people a year.