Well, it's a new virus. The initial dosage(s) was determined through (admittedly hurried) clinical trials and research. The booster was first talked about during the spring as I remember. Not surprising given the fast nature at which information breaks on this virus. It's highly contagious and its effects on the body are essentially a crapshoot. If COVID-19 wasn't the "ginormous" health issue that Democrats...and Republicans take seriously, then there wouldn't be 685K dead, the economy wouldn't have tanked, and millions of infected and recovered people wouldn't have to deal with the long term effects of the virus.Well for starters, no other vaccine in history needs to be applied three time in less than a year, um with "boosters". NEVER. Couple that with just...well...covid19 isn't this ginormous health issue the democrats make it out to be...it just isn't.
You get a flu shot every year. Your tetanus has to be boosted every few years or so. Even the shingles vaccine requires a booster (believe me, you don't want the shingles). I'm not sure what the big deal is.
The other vaccines have been determined over the years as only needing a single shot. I wouldn't say that will be the case with this virus. It's going to continue to use the un-vaccinated as its petri dish and I'm sure it will mutate again.