health and well-being
public health crisis management
illness
diseases and medical conditions
concepts
systemic diseases
disease, disability, health, and health behavior
sexually transmitted diseases
infectious disease
Infectious disease is any infection or disease caused by certain microbes (called pathogens), such as viruses, bacteria, fungi, parasites (including protozoa and helminths), and atypical proteins known as prions. (Viruses are not considered microbes by strict definition but are included in this discussion.) Infectious disease is determined by the presence of a pathogenic agent and the common symptoms (some are asymptomatic in humans) for the particular microbe. [Source: Encyclopedia of Crisis Management; Infectious Disease]