yes, but those are not as simple as Covid-19, Covid-19 is a cold variant, that we already know how to treat, so it will not take as long. other diseases are not mere variants that we know how to deal with. or, are like cancer with lots of variants of the disease. and even more evidence would be that not all new and improved things can kill complex viruses that not even most scientist fully understand. as a matter of fact, Covid-19 is a pretty weak virus compared to others in the past such as the black plague, polio, etc were way more complex, contagious, and hard to treat. so naturally if we have experience/knowledge with pandemics, more technology, and variant of a disease that we already know of, then we should expect to get a vaccine fairly quick. also let it be known i am trying to be toxic and be all your wrong and dumb, but rather clear up information for you so you will have answers, and hopefully get the vaccine so we can all end this pandemic.