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SvennoJ said:

What is the difference between the first and second shot? I've heard it a lot that the first dose hardly gives a reaction then the second dose hits like a truck. My dad had the same thing with his second dose.

Don't remember which manufacturer you said you got, but my first shot of Moderna gave me a sore shoulder for a couple days while the second shot did the same along with some mild flu like symptoms for just as long.