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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.
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]
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 ...