Reply to If Flu and Covid vaccines take 2 weeks to work, why is fever on day 1?

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Reply to "If Flu and Covid vaccines take 2 weeks to work, why is fever on day 1?"

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[quote=Anonymous][quote=Anonymous]OP, there are two types of immune responses: innate and adaptive.

Innate immune responses are generalized, not specific to the antigen. They unfold the same way every time. They also happen immediately. Fever is an innate response.

The adaptive immune system is antigen-specific. Adaptive responses include making the specific antibodies needed to neutralize this antigen, and developing the specific memory cells that help your body recognize and defend against that pathogen in the future. Because the adaptive immune system is quite complex, and involves some degree of “learning” it takes quite a bit longer than the innate responses. [/quote]

+1. To think of it more simply, imagine someone breaks into your compound. First step is to send in the rapid response guys to take him out. They might be bumbling and slow or wildly overshoot while they figure out the right response to take out the threat.

After you’ve taken out the threat, then you clean up the mess, survey the perimeter, and develop a plan to target similar threats more precisely next time. The plan is what takes 2 weeks. [/quote]

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