India, Oct. 11 -- We live in a globalised world where a microscopic pathogen can travel from a remote forest or a bio-research lab to humans within hours. The invisible enemies that cause pandemics- cholera, influenza, and the plague- have rewritten human history. Terms like "infectious," "communicable," and "contagious" are frequently used interchangeably in news broadcasts and public health advisories, although they have distinct scientific meanings. Understanding these definitions, the difference between infection and a true global threat, tracking how pathogens move through communities, how health authorities respond to a crisis, and recognizing the role of specialized laboratories is our first line of defence against public health th...