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Coronavirus: With Omicron, is it possible to achieve lifelong immunity against COVID-19?

The human body has two main lines of defense i.e. the innate immune system and the adaptive immune system. An innate immune response is the first line of defense that kicks in early when a viral particle is identified. On the other hand, an adaptive immune response takes more time in triggering a response, because the immune system has to first recognize the viral invader before initiating a specialized attack.

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