I'm sure Phuck-shi will get right on that, as soon as he finishes with Coronavirus, Ebola, H1N1, AIDS, etc., etc. ....
We have vaccines for H1N1 and Ebola.
Coronavirus is a family of viruses. 7 of them are known to infect humans. SARS-CoV-1 (SARS 2003) had viable vaccine candidates produced that made it through phase 1 and phase 2 human trials. The disease burned out before the (very expensive) phase 3 trials began, so those never got funded. MERS-CoV (MERS 2012) was the same story as SARS 2003. Vaccine candidates developed, made it through phase 1 and 2, no funding for phase 3. SARS-CoV-2 (COVID-19) is another coronavirus. Multiple vaccine candidates nearing the end of phase 3 trials right now. Probably have 2-5 approved before the end of the year.
The other 4 coronaviruses known to infect humans are among the over 200 viruses from multiple viral families which cause the “common cold”. There’s no vaccine coming because it would cost a fortune to develop and test a vaccine for over 200 different viruses. Nobody’s going to pay $20,000 a year for a vaccine that just prevents getting a cold. People would rather just get a cold.
HIV is a difficult case mainly because the immune system largely ignores it and HIV is extremely adept at hiding from the immune system when a reaction does take place. All a vaccine does is show the immune system what a pathogen looks like so the immune system can trigger the process for building lasting immunity. If the immune system doesn’t react to the pathogen in the first place, and if the immune system can’t find and kill the pathogen because of how it hides, then a vaccine is pretty difficult to manage. Add to that HIV’s incredibly unstable genome, and you start to see why we’ve gone this long without a working vaccine.