Re-emerging diseases are infectious diseases that had previously declined in incidence or were brought under control but have reappeared due to factors such as pathogen evolution, antimicrobial resistance, environmental changes, globalization, urbanization, declining vaccination coverage, and weak public health systems. Diseases such as tuberculosis, cholera, dengue, measles, influenza, Ebola, and even recurring coronavirus outbreaks illustrate that infectious diseases remain a persistent global threat. Since pathogens do not recognize national boundaries, effective preparedness and response require strong global cooperation supported by resilient national health systems. Globalization has significantly increased the speed at which diseases spread. International travel, trade, migration, and interconnected supply chains enable infectious agents to cross continents within hours. An outbreak confined to one region can rapidly become a global emergency, making international surveillance and coordinated response indispensable. One of the most important aspects of global cooperation is disease surveillance and early warning. Timely detection, transparent reporting, and rapid sharing of epidemiological information enable countries to implement containment measures before outbreaks escalate. International surveillance networks help identify