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"The vaccine is known to be safe and with few side effects"

The COVID vaccines are also "known" to be safe and with few side effects, by the sort of public health people who like to make such claims. That doesn't mean anything.

Here's the problem with flu vaccines. They do not correlate with any reduction in mortality attributed to flu. Every trial indicates effectiveness, yet despite hugely increased number of flu vaccines over the years, deaths due to flu do not move. A rational person should wonder what this implies about the reliability of vaccine trials.