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Asymptomatic carriers can be categorized by their current disease state. [5] When an individual transmits pathogens immediately following infection but prior to developing symptoms, they are known as an incubatory carrier. Humans are also capable of spreading disease following a period of illness.
For example, the human body louse transmits the bacterium Rickettsia prowazekii which causes epidemic typhus. Although invertebrate-transmitted diseases pose a particular threat on the continents of Africa, Asia and South America, there is one way of controlling invertebrate-borne diseases, which is by controlling the invertebrate vector.
Lyme disease; Plague; West Nile virus; Many factors affect the incidence of vector-borne diseases. These factors include animals hosting the disease, vectors, and people. [21] Humans can also be vectors for some diseases, such as Tobacco mosaic virus, physically transmitting the virus with their hands from plant to plant. [citation needed]
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 ...
Subclinical infections can occur in both humans and animals. [2] Depending on the pathogen, which can be a virus or intestinal parasite , the host may be infectious and able to transmit the pathogen without ever developing symptoms; [ 3 ] [ 4 ] such a host is called an asymptomatic carrier . [ 3 ]
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.
Human granulocytic anaplasmosis (HGA) PCR: Doxycycline: No Human metapneumovirus (hMPV) Human metapneumovirus infection No Ehrlichia chaffeensis: Human monocytic ehrlichiosis: PCR: Doxycycline: No One of the human papillomaviruses: Human papillomavirus (HPV) infection Yes: Human parainfluenza viruses (HPIV) Human parainfluenza virus infection ...
Disease carrier could refer to: Asymptomatic carrier , a person or organism infected with an infectious disease agent, but displays no symptoms Genetic carrier , a person or organism that has inherited a genetic trait or mutation, but displays no symptoms