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?