This is a movie about how a bat virus spread throughout the world and turned everyone into a vampire. It also talks about how people who were bitten by a bat previously, and recovered, now had immunity. Furthermore, it shows how a blood transfusion, using antibodies from a recovered person, can help stop the virus. This is a good movie. Just substitute COVID-19 for vampire in the movie, and I think you can get a lot out of it.
I only have one regret, however. This movie was made in 1964. We have known about this type of cure for a long, long time, at least over a century. So why are our leaders stumbling around blind like they do not have a clue what to do?