https://doi.org/10.1093/cid/ciab941
... What? Here in Germany, that's like one of the basic things that people who deal with needles on anything alive learn.
https://www.cdc.gov/vaccines/hcp/acip-recs/general-recs/admi...
In practice there is a wide variance between US healthcare providers depending on where they work and how they were trained. Some aspirate, some don't, some try but use the wrong technique.
From the first one, it actually says for men younger than 40, myocarditis is actually higher in vaccinated, whereas for women it's similar to infection:
"In men younger than 40 years old, the number of excess myocarditis events per million people was higher after a second dose of mRNA-1273 than after a positive SARS-CoV-2 test (97 [95% CI, 91–99] versus 16 [95% CI, 12–18]). In women younger than 40 years, the number of excess events per million was similar after a second dose of mRNA-1273 and a positive test (7 [95% CI, 1–9] versus 8 [95% CI, 6–8])."
That supports my belief that vaccination should be voluntary for everyone but especially young people.
I haven't read it beyond the abstract.
We estimated an extra two (95% confidence interval (CI) 0, 3), one (95% CI 0, 2) and six (95% CI 2, 8) myocarditis events per 1 million people vaccinated with ChAdOx1, BNT162b2 and mRNA-1273, respectively, in the 28 days following a first dose and an extra ten (95% CI 7, 11) myocarditis events per 1 million vaccinated in the 28 days after a second dose of mRNA-1273. This compares with an extra 40 (95% CI 38, 41) myocarditis events per 1 million patients in the 28 days following a SARS-CoV-2 positive test.
Putting strain on the already overwhelmed healthcare system is a voluntary choice? Especially antisocial: the person who made the voluntary choice to attend the hospital now chooses to infect the healthcare personnel. If that's not evil it's hard to say what would be.
We are seeing the fallout in the labour participation rate - it's partly due to people retiring instead of risking catching a potentially disabling disease and partly due to people unable to work because of Covid sequelae. One hopes that the government catches on.
In other words, all of the participants received covid vaccines.
The second paper you've linked studied unvaccinated persons (mRNA-vax recipients were specifically excluded) and its claim of higher rates of myocarditis for covid infection is based other researchers' values of myocarditis incidence post-vax and, as alluded to in the Discussion section, skewed by relatively low 2nd-shot uptake among the American participants (myocarditis risk associated with mRNA shots goes up with each successive dose).
The Israeli paper looks at myocarditis in persons before the vaccines became available (March 2020) and then afterwards. In Israel, 2nd shot and further shot uptake was much higher than in many other places.
Studies in the UK [1] and US [2] have shown that while, yes, there is an increased risk for myocarditis in vaccinated people, the risk of myocarditis in infected people is way higher.
[1] https://www.ahajournals.org/doi/full/10.1161/CIRCULATIONAHA....
[2] https://pubmed.ncbi.nlm.nih.gov/34341797/