But why would you take a vaccine that is not really effective and cannot be tested in the right way? I don't want a vaccine like that. I am also not afraid of getting infected. For me, I know it will be without symptoms, or only mild like a simple cold. Then a vaccine is worser than the infection itself. I am not against vaccines, but for example, HPV is also a one that I would not take. I don't need an influenza vaccine, but took the one for hepatitus A, or tetanus. They are already so long on the market that you know what can happen. And a couple of years I took the DTP vaccine again and yes, I went ill. 2 days I was not fit. Ok, I could do diving, but I was tired, my arm hurted, but I knew it is was not a real illness, it was from the vaccine. If I get the same reaction from an corona or influenza vaccine, I will not take it. The reason is risk-risk. The risk of getting ill is for me almost zero. Once in 8 years or so I get a fever from influenza. That is better than every year 2 days ill. No symptoms or just a 2 days cold from corona what you also don't know how often you get it, but I think it will be in the 1 in 5 or 10 years range, is less problematic than 2 days ill because of a vaccine every year.
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Any vaccine is going to be tested and effective, but they will all work in different ways and the efficacy will have limitations.
Your arm hurting, feeling ill, that indicates your body had a significant reaction to the vaccine. That indicates the DPT vaccine introduced a bacteria that your body was not prepared for, and it had a strong response. I would caution being confident that you would be asymptomatic, your immune system may be healthy but it might not be as prepared as you think. Catching the flu rarely does not mean you have a strong immunity to it, its a less infectious virus, but it is entirely your decision. Each year your immune response will vary, so not every year would be two days of feeling ill. For me this year was nothing, last year was going to bed early on the night I had the vaccine.
My boss lives in South Africa, his wife spent four weeks recovering from COVID-19. It is not a cold. Clearly many people are not seriously ill, but I personally know people that have been very ill.