Also, people do get tetanus boosters as needed and some people do have to get another round of Hep-B again. My wife who is about to enter a nursing program has to go through another regimen of Hep-B because her medical paperwork shows she doesnt have immunity. She was vaccinated. It does occur in some people that their body does not retain immunity.
Now yes, I would like to see a better COVID shot. Or atleast know the full limits of the COVID shot. We are still not 100% how long someone has immunity. Hopefully it is a long time. If it turns out to be short, well yes I think we all want longer. There is also no garuntee of protection against variants. Measles could very well morph out in the wild as something different and current MMR vaccines render useless. I would actually say it is not an if, but when. As it is common for things to evolve over time.
Yes, no vaccine or therapeutic is 100%, but a vaccine delivered via the arm deltoid muscle is going to produce blood/serum antibodies. A respiratory virus like SARS-CoV-2 enters via the upper respiratory system, usually the nose. Natural immunity provides substantial mucosal antibodies in the upper respiratory system but current Covid vaccines do not. This is why a vaccinated person can get infected (via nose) and still be protected against symptoms (by blood/serum antibodies).
https://www.mayoclinic.org/diseases-conditions/measles/exper....
Also, people do get tetanus boosters as needed and some people do have to get another round of Hep-B again. My wife who is about to enter a nursing program has to go through another regimen of Hep-B because her medical paperwork shows she doesnt have immunity. She was vaccinated. It does occur in some people that their body does not retain immunity.
Now yes, I would like to see a better COVID shot. Or atleast know the full limits of the COVID shot. We are still not 100% how long someone has immunity. Hopefully it is a long time. If it turns out to be short, well yes I think we all want longer. There is also no garuntee of protection against variants. Measles could very well morph out in the wild as something different and current MMR vaccines render useless. I would actually say it is not an if, but when. As it is common for things to evolve over time.