Viral infections, bacterial infections and fungal infections are the 3 main types of infectious diseases affecting large numbers of people throughout the world. Some of the common infectious diseases are sleeping sickness, cholera, dengue fever, malaria, hepatitis A, hepatitis B, hepatitis C, influenza, HIV (AIDS), measles, mumps, meningitis, encephalitis, tuberculosis, pneumonia, typhoid, actinomycosis, candidiasis, diphtheria, food poisoning, gastroenteritis, gonorrhea, syphilis, herpes simplex, rabies, scabies and tetanus.