Contagious diseases are illnesses caused by pathogens such as viruses, bacteria, fungi, or parasites that can be spread directly or indirectly from one person to another. Here are the top 20 contagious diseases, explained in detail: Influenza (Flu) Cause: Influenza viruses (A, B, and C types) Transmission: Airborne droplets, direct contact with infected surfaces Symptoms: […]
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