why ‎is ‎the ‎second ‎dose ‎of ‎Corona ‎vaccine ‎more ‎difficult ‎than ‎the ‎first ‎

The second dose is more painful It has become known that people who receive the second dose of the Corona vaccine, suffer more severe side effects than those that occur after taking the first dose. The question is: Why? The American news site wgno says that the side effects that occur after receiving the second dose include fatigue, headache, chills, fever, nausea, and muscle pain.
There is a simple explanation for the higher side effects while taking the second dose. The vast majority of vaccines approved by countries of the world so far consist of two doses, with an average interval of 3 weeks, with the exception of the "Johnson & Johnson" vaccine, which consists of a single dose. That the body after the first dose begins to build the first immune response, including antibodies. And with the second dose, the body's immune system begins to react, according to Grino, who says that once the immune system knows about the vaccine (after the second dose), it will have a greater reaction to it.

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