Scientists have been trying to come up with a vaccine for coronaviruses for at least 20 years.  It goes great until they reach animal trials.  The animals are vaccinated and have the desired antibody response.  When the animals are exposed to coronaviruses their immune system overreacts causing a cytokine storm and drowning most of the animal in their own fluids. And NOW they are going to have a vaccine in a matter of months, skipping many safety steps?  Pass.