This is true. However, it does not change that your original statement was false.

In the US military, an anthrax vaccine was mandatory for a time upon deploying the Middle East. It is a very painful vaccine that makes anthrax survivable, but anthrax will still do a lot of damage regardless. I would say this is very similar to the results we see with the covid vaccine, though the covid vaccine is actually much more effective.

Notice I correctly use the word "vaccine" for both of these. A vaccine is simply a biological preparation that gives our immune system exposure to train against a real threat, without experiencing the adverse impacts of the real threat itself.

You may add qualifiers to the "vaccine" word, such as a "permanent, one-dose vaccine." Now you've correctly established an appropriate context to properly communicate what you mean correctly

I have found in life it is better to remain silent when I have doubt, than to spread false information.

Here is a small tip: regardless of the controversy around AI, a helpful way to use it is to state something you think as fact, and double check with the AI. This provides you with a more objective medium without needing to experience public embarrassment or offending people.

Good luck!

If you're no expert, why spew likely wrong information so confidently? While admitting you don't know what you're talking about, you still aren't clearly admitting you were wrong. You are just pivoting and deflecting. Be honest and open to self reflection and you might become a better person.