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A contagious disease is an infectious disease that can be spread rapidly in several ways, including direct contact, indirect contact, and Droplet contact. [1] [2] These diseases are caused by organisms such as parasites, bacteria, fungi, and viruses. While many types of organisms live on the human body and are usually harmless, these organisms ...
In these cases, the basic reproduction number of the virus, which is the average number of additional people that a single case will infect without any preventative measures, can be as high as 203.9. [9] [10] Interhuman transmission is a synonym for HHT. [11]
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 include the common cold , gastroenteritis , COVID-19 , the flu , and rabies .
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 ]
Hendra virus infection HF Heart failure: HFA High-functioning autism: HFMD Hand, foot, and mouth disease: HFRS Hemorrhagic fever with renal syndrome: HI Hearing impaired: HiB disease Haemophilus influenzae type B disease: HIBM Hereditary inclusion body myopathy: HMSN Type III Hereditary motor and sensory polyneuropathy type III (see Dejerine ...
Widespread non-communicable diseases such as cardiovascular disease and cancer are not included. An epidemic is the rapid spread of disease to a large number of people in a given population within a short period of time; in meningococcal infections , an attack rate in excess of 15 cases per 100,000 people for two consecutive weeks is considered ...
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Examples of vertical transmission include hepatitis B virus and HIV, where the baby is born already infected with the virus. [116] Another, more rare, example is the varicella zoster virus , which, although causing relatively mild infections in children and adults, can be fatal to the foetus and newborn baby.