March Coronavirus Open Thread
In general vaccines are very easy to make. You grow the virus you want to vaccinate against, kill or weaken it, and inject it, often with an adjuvant. Viral illnesses that don't have vaccines today are the exception where it turns out that doesn't work and it's more challenging. These difficult ones are what all vaccine research today is focused on, so people think making vaccines is hard.
It usually isn't. Small pox, measles, mumps, rubella, chicken pox, and polio are all gone. Flu is 4 new viruses we make brand new vaccines for every year.