vaccine development

Dr. Anthony Fauci, along with two of his colleagues at the National Institute of Allergy and Infectious Diseases, has written a long, science-filled piece on the hurdles of creating a vaccine against some viruses, particularly COVID-19.
“This will go down in history as one of science and medical research's greatest achievements. Perhaps the most impressive.
In the pharmaceutical industry, there's a low-level Hatfield-McCoy thing between chemists and biologists that's been going on forever. Each group thinks that the other group is a bunch of morons.
In the world of infectious diseases, it is always better to prevent an infection than to treat it. Almost without exception, this means vaccination is the way to go (1). But it's not so easy. Far from it.
Would our deceased Presidents fare better today medically than they did in their respective eras? The answer might surprise you.