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A contagious disease is an infectious disease that is readily spread (that is, communicated) by transmission of a pathogen through contact (direct or indirect) with an infected person. [ 1] A disease is often known to be contagious before medical science discovers its causative agent. Koch's postulates, which were published at the end of the ...
An infectious disease agent can be transmitted in two ways: as horizontal disease agent transmission from one individual to another in the same generation (peers in the same age group) [3] by either direct contact (licking, touching, biting), or indirect contact through air – cough or sneeze (vectors or fomites that allow the transmission of the agent causing the disease without physical ...
Zoonosis. A zoonosis ( / zoʊˈɒnəsɪs, ˌzoʊəˈnoʊsɪs / ⓘ; [ 1] plural zoonoses) or zoonotic disease is an infectious disease of humans caused by a pathogen (an infectious agent, such as a bacterium, virus, parasite, or prion) that can jump from a non-human (usually a vertebrate) to a human and vice versa. [ 1][ 2][ 3] Major modern ...
Infectious disease. A hospital-acquired infection, also known as a nosocomial infection (from the Greek nosokomeion, meaning "hospital"), is an infection that is acquired in a hospital or other healthcare facility. [ 1] To emphasize both hospital and nonhospital settings, it is sometimes instead called a healthcare-associated infection. [ 2]
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1] Examples are the common cold, gastroenteritis and pneumonia. [ 2]
An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection. Infections can be caused by a wide range of pathogens, most prominently bacteria and viruses. [ 2] Hosts can fight infections using their immune systems.
Septicemic plague is caused by horizontal and direct transmission. [3] Horizontal transmission is the transmitting of a disease from one individual to another regardless of blood relation. Direct transmission occurs from close physical contact with individuals, through common air usage, or from direct bite from a flea or an infected rodent.
Rinderpest was mainly transmitted by direct contact and by drinking contaminated water, although it could also be transmitted by air. [4] Rinderpest is believed to have originated in Asia, and to have spread by transport of cattle. [5] [6] [7] The term Rinderpest (German: [ˈʁɪndɐˌpɛst] ⓘ) is a German word meaning "cattle plague".