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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 ...
Transmissibility is the probability of an infection, given a contact between an infected host and a noninfected host. [8] Community transmission means that the source of infection for the spread of an illness is unknown or a link in terms of contacts between patients and other people is missing. It refers to the difficulty in grasping the ...
Diphtheria is an infection caused by the bacterium Corynebacterium diphtheriae. [ 2] Most infections are asymptomatic or have a mild clinical course, but in some outbreaks, the mortality rate approaches 10%. [ 1] Signs and symptoms may vary from mild to severe, [ 1] and usually start two to five days after exposure. [ 2]
Mpox, formerly known as monkeypox, is a viral infection characterized by painful lesions. It’s spread by direct contact with an infected person, animal or contaminated items like clothing or ...
Human-to-human transmission can occur through direct contact with infected skin or body fluids, including sexual contact. [1] People remain infectious from the onset of symptoms until all the lesions have scabbed and healed. [7] The virus may spread from infected animals through handling infected meat or via bites or scratches. [7]
The common cold is an infection of the upper respiratory tract which can be caused by many different viruses. The most commonly implicated is a rhinovirus (30–80%), a type of picornavirus with 99 known serotypes. [ 31] Other commonly implicated viruses include adenoviruses, enteroviruses, parainfluenza and RSV. [ 32]
Transmission of COVID-19. The transmission of COVID-19 is the passing of coronavirus disease 2019 from person to person. COVID-19 is mainly transmitted when people breathe in air contaminated by droplets / aerosols and small airborne particles containing the virus. Infected people exhale those particles as they breathe, talk, cough, sneeze, or ...
As of September 2020, it was unclear whether these symptoms were due to direct infection of brain cells, or of overstimulation of the immune system. [67] A June 2020 systematic review reported a 6–16% prevalence of vertigo or dizziness, 7–15% for confusion, and 0–2% for ataxia. [2]