Elderly people are highly susceptible hosts because their immune systems aren't able to fight newly encountered diseases. For this same reasons, vaccines are less effective. Nursing home residents are even more susceptible to things like Covid. That's why this Covid thing is a disaster like we've been saying for over a year now but the armchair medical professionals always seem to know more. /sarc
Now maybe you understand why we have half a million dead Americans.
The mRNA vaccine is safe and effective. My wife and I have had both doses of the Moderna vaccine and we’re just fine. Over 70% of Israel has had both doses of the same vaccine and they’re just fine.
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mRNA vaccines are a new approach to vaccines. Perhaps it is the best new technological breakthrough in 20 years. Perhaps not. There is no long term data.
Consider the past disaster with thalidomide. Initial testing showed the drug to be completely safe. But, no tests were done at the time on pregnant woman as it was thought drugs could not breach the placental barrier.
It took 5 years for people to connect the devastating effect the drug could have on foetal development.