NYT om coronavirus och immunitet

Ett vaccin mot coronaviruset kan i värsta fall få motsatt effekt mot den som eftersträvas:

”And then there is the question of immune enhancement: Through a variety of mechanisms, immunity to a coronavirus can in some instances exacerbate an infection rather than prevent or mitigate it. This troublesome phenomenon is best known in another group of viruses, the flaviviruses, and may explain why administering a vaccine against dengue fever, a flavivirus infection, can sometimes make the disease worse.”