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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 ...
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 ...
25–90% mortality [ 1] Ebola, also known as Ebola virus disease ( EVD) and Ebola hemorrhagic fever ( EHF ), is a viral hemorrhagic fever in humans and other primates, caused by ebolaviruses. [ 1] Symptoms typically start anywhere between two days and three weeks after infection. [ 3] The first symptoms are usually fever, sore throat, muscle ...
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]
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.
2,700 (2015) [4] Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides. [1] Infections have no symptoms in more than 85% of cases, especially if the number of worms is small. [1] Symptoms increase with the number of worms present and may include shortness of breath and fever in the beginning of the disease. [1]
Pathogenic bacteria. Neisseria gonorrhoeae (small red dots) in pus from a man with a urethral discharge ( Gram stain) Pathogenic bacteria are bacteria that can cause disease. [1] This article focuses on the bacteria that are pathogenic to humans. Most species of bacteria are harmless and are often beneficial but others can cause infectious ...
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]