Im not a doctor or medical professional so I cannot say for certain. I can only use deductive reasoning. Here is what I’ve gathered:
I think there are two separate things here, and it’s important not to confuse them.
First, I don’t doubt your experience. You became seriously ill, the timing followed vaccination, and I can completely understand why that would make you question whether the two were connected. I also don’t think anyone here can tell you that the vaccine definitely didn’t contribute to your particular medical condition without knowing your diagnosis and medical history.
But there are a few factual things worth clearing up.
COVID vaccines can cause adverse events. Some rare serious ones were identified, including myocarditis/pericarditis and, with the AstraZeneca and Johnson & Johnson vaccines, a particular type of dangerous clotting disorder. Those associations were discovered because researchers investigated reports and compared the frequency and pattern of illness with what would normally occur in the population.
That’s the important distinction.
Someone becoming ill after vaccination establishes a timeline. It doesn’t, by itself, establish what caused the illness. The same applies to healthy soldiers, personal trainers or people who don’t drink or smoke. Unfortunately, healthy people develop serious illnesses too. To establish that a vaccine is causing a particular condition, you need to determine whether that condition occurs more frequently in vaccinated people than would otherwise be expected.
We now have more than five years of safety monitoring involving billions of vaccine doses. That research has identified genuine vaccine risks, but it hasn’t shown a general pattern of COVID vaccination causing widespread unexplained deterioration in otherwise healthy people.
There’s also nothing unusual about catching COVID after being vaccinated. The vaccines were never 100% effective at preventing infection, protection against infection waned, and later variants became increasingly capable of infecting vaccinated people. Their strongest and most persistent benefit was reducing severe illness, hospitalization and death.
And herd immunity doesn’t mean everyone in a vaccinated workplace becomes incapable of transmitting the virus. In fact, as the virus evolved and immunity against infection waned, that kind of sterilizing population immunity became unrealistic.
So I think the most scientifically defensible part of what you wrote is actually this:
You don’t know whether the vaccine caused your illness.
Your experience gives you a perfectly reasonable reason to ask the question. But your timeline alone can’t answer it.
If you’re genuinely trying to find out, the most useful information would be your actual diagnosis and whether that specific condition has been studied following COVID vaccination. That’s something evidence can potentially answer much better than either of us trying to deduce causation from timing.
