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Recent (end of 2024!!) social media discussion:

Someone: I won't do covid-19 boosters, they cause myocarditis. 3 upvotes, 8 downvotes.

Pro-vaxer: Here is a link to a study proving that covid-19 vaccine causes myocarditis, but covid-19 causes myocarditis more often.
15 upvotes, no downvotes.

Me: Could you please explain why you claim that this study proves that "covid-19 vaccine causes myocarditis, but covid-19 causes myocarditis more often", while the study does not explore frequency of myocarditis after covid-19 and after the vaccine at all? All the study does is demonstrating that post-vaccine myocarditis is less harmful than post-covid19 one.
6 downvotes, no upvotes.

Pro-vaxer: Oh, sometimes stupid antivaxers even read the linked studies! But they can't comprehend what they read, this is the problem. You see, even the abstract says: "Patients with post–COVID-19 mRNA vaccination myocarditis, contrary to those with post–COVID-19 myocarditis, show a lower frequency of cardiovascular complications than those with conventional myocarditis at 18 months."
You probably just read a part of the summary, which says "Post-vaccination myocarditis after vaccination with anti-COVID vaccines has a milder course and a lower risk of developing complications in the long term."
You think I made an error, but the error is all yours!
0 downvotes, 1 upvote

Me:
Let's think step by step:
1. From your first comment: "covid-19 vaccine causes myocarditis, but covid-19 causes myocarditis more often"
Let's assume P(A) the probability of getting myocarditis from the vaccine, and P(B) the probability of getting myocarditis from COVID.
So, your statement is P(A) < P(B).


2. From your second comment, the first quote from the abstract, which, in your opinion, I misunderstood. "Patients with post–COVID-19 mRNA vaccination myocarditis, contrary to those with post–COVID-19 myocarditis, show a lower frequency of cardiovascular complications than those with conventional myocarditis at 18 months." Please re-read it again. It says nothing at all about P(A) and P(B). All it says is that P(C|A) < P(C|B), where P(C) is the probability of cardiovascular complications 18 months after the diagnosis of myocarditis.
1 downvote, 0 upvotes, no responses so far.

The scary part is that Pro-vaxer is likely a doctor, based on his (or her) other comments. Confirmation bias maybe really tough.
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