Why we can’t be sure we’ll get a coronavirus vaccine
Ian Sample reports: Earlier this week, England’s deputy chief medical officer Jonathan Van-Tam said the words nobody wanted to hear: “We can’t be sure we will get a vaccine.” But he was right to be circumspect. Vaccines are simple in principle but complex in practice. The ideal vaccine protects against infection, prevents its spread, and does so safely. But none of this is easily achieved, as vaccine timelines show. More than 30 years after scientists isolated HIV, the virus that…