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Typically, influenza is transmitted from infected mammals through the air by coughs or sneezes, creating aerosols containing the virus, and from infected birds through their droppings. Influenza can also be transmitted by saliva, nasal secretions, feces and blood. Infections occur through contact with these bodily fluids or with contaminated ...
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 ...
While usually caused by the Epstein–Barr virus, also known as human herpesvirus 4, which is a member of the herpesvirus family, [3] a few other viruses [3] and the protozoon Toxoplasma gondii [7] may also cause the disease. It is primarily spread through saliva but can rarely be spread through semen or blood. [2]
Of the three species in the genus Trichomonas, T. tenax is the smallest, measuring only 5-14 μm long and 6-9 μm wide; specimens can be identified by their long axostyles and tails, 4 anterior flagella, and by the recurrent flagellum that raises an undulating membrane which is two thirds the length of the body.
Some infectious diseases can be spread via respiratory droplets expelled from the mouth and nose, as when a person sneezes. A respiratory droplet is a small aqueous droplet produced by exhalation, consisting of saliva or mucus and other matter derived from respiratory tract surfaces. Respiratory droplets are produced naturally as a result of ...
[4] [84] Slaves in the West Indies having contracted dengue were said to have the posture and gait of a dandy, and the disease was known as "dandy fever". [ 85 ] [ 86 ] The term break-bone fever was applied by physician and United States Founding Father Benjamin Rush , in a 1789 report of the 1780 epidemic in Philadelphia , due to the ...
It is most commonly transmitted from ticks to humans. Humans act as the tick's host for this bacteria. Lyme disease is a zoonotic, vector-borne disease transmitted by the Ixodes tick (also the vector for Babesia and Anaplasma). The infected nymphal tick transmits B. burgdorferi via its saliva to the human during its blood meal. [25]
Early life horizontal transmission can occur through bites, lesions, certain sanitary habits, or other contact with secretions or saliva containing HBV. [ 33 ] [ 34 ] Adult horizontal transmission is known to occur through sexual contact , [ 35 ] blood transfusions and transfusion with other human blood products, [ 36 ] re-use of contaminated ...