Infectious Diseases COVID-19 Measles Rodent-Borne Diseases Guinea Worm Disease Leptospirosis Chronic Illnesses Malaria HIV Guillain-Barré Syndrome Malaria and Typhoid Guillain-Barre Syndrome Avian Flu Immunology Avian Influenza Hantavirus Hepatitis A Sanitation Cancer Heart Disease Dengue Fever Mosquito-Borne Illnesses Covid-19 Bird Flu Polio Chemical Exposure Nervous System Epidemics Typhus Viral Diseases Mpox and Parvovirus Cholera Sickle Cell Disease