Global health and infectious diseases are closely linked, as infectious diseases continue to be a major cause of illness and death worldwide. Diseases like HIV/AIDS, tuberculosis, malaria, and COVID-19 disproportionately affect low- and middle-income countries, where access to healthcare and vaccines may be limited. Global health efforts focus on improving healthcare systems, strengthening surveillance, and ensuring equitable access to vaccines and treatments. Preventing infectious diseases requires international collaboration, with organizations like the WHO and CDC playing key roles. Addressing social determinants of health, such as poverty and inadequate sanitation, is also crucial in controlling disease spread.