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Question
Why don't we develop immunity towards common cold?
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Solution
IMMUNISATION INVOLVES WEAK OR DEAD PATHOGEN INJECTED INTO THE BODY . OUR IMMUNE SYSTEM IDENTIFIES THE PROTIEN COVER AND DESTROYS IT AND WILL BE READY TO DEFEAT WHENEVER THE PATHOGEN ATTACKS .
BUT INFLUENZA VIRUS ALWAYS CHANGES ITS PROTEIN COVER . SO , OUR IMMUNE SYSTEM CANT IDENTIFY IT AND IT WILL NOT BE EFFECTIVE .
if u are satisfied with the answer do like it....
IMMUNISATION INVOLVES WEAK OR DEAD PATHOGEN INJECTED INTO THE BODY . OUR IMMUNE SYSTEM IDENTIFIES THE PROTIEN COVER AND DESTROYS IT AND WILL BE READY TO DEFEAT WHENEVER THE PATHOGEN ATTACKS .
BUT INFLUENZA VIRUS ALWAYS CHANGES ITS PROTEIN COVER . SO , OUR IMMUNE SYSTEM CANT IDENTIFY IT AND IT WILL NOT BE EFFECTIVE .
if u are satisfied with the answer do like it....
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