<s>[INST] Can I catch the same cold or flu twice? [/INST] Because the viruses that cause a cold or the flu can mutate, you can catch them more than once, and pass them on to your friends, family or work colleagues. Conversely you can pick up the same cold or flu a week or two later. Why? That’s because the initial virus has mutated slightly and the immunity that your body generated to fight the virus last time around will no longer be effective against the new strain. Source: Theraflu. Link: https://www.theraflu.com/faqs/. Field: General Medicine. Disease: Cold </s>