@Medicosaddaover 7 years ago
Why common cold is so common? . . . Can you answer this simple question.... .. Comment below your answers...
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over 7 years ago
Cos it can be easily spread. For affected individuals to unaffected ones
over 7 years ago
Actually on exposure of pathogen memory cells makes memory of only 15 days hope u got it 😊😊😊😊
