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Cell injury and clinical illness Destruction of virus-infected cells in the target tissues and physiologic alterations produced in the host by the tissue injury are partly responsible for the development of disease. Recovery from infection The host either succumbs or recovers from viral infection. Recovery mechanisms include both innate and adaptive immune responses. Interferon (IFN) and other cytokines, humoral and cell-mediated immunity, and possibly other host defense factors are involved. The relative importance of each component differs with the virus and the disease.

In acute infections, recovery is associated нажмите чтобы увидеть больше viral clearance. However, there are по этой ссылке when the host remains persistently infected with the virus. Virus shedding The last stage in pathogenesis is the shedding of infectious virus into the environment. This is mass index body calculator necessary step to maintain a viral infection in populations of hosts.

Shedding usually occurs from the body surfaces involved in viral entry. Shedding occurs at different stages of disease depending on the particular agent involved. African swine fever (ASF) is a highly contagious haemorrhagic viral disease of domestic and wild pigs, which is responsible for serious economic and production losses.

Currently there is no approved vaccine for ASF. Prevention in countries free of the disease depends on implementation of appropriate import policies and biosecurity measures, ensuring that neither infected live pigs nor pork products are introduced into areas free of ASF. Historically, outbreaks have been reported in Africa and parts of Europe, South America, and the Caribbean. Since 2007 the disease has been reported in multiple countries across Africa, Asia, and Europe, in both domestic and wild pigs.

Links to Code and Manual Terrestrial code Code Chapter on Disease Manual Chapter on DiseasesAfrican swine fever (ASF) is a highly contagious haemorrhagic viral disease of domestic and wild pigs, which is mass index body calculator for serious economic and production losses. It is mass index body calculator by a large DNA virus of the Asfarviridae family, which also infects ticks of the genus Ornithodoros.

Although signs of ASF and classical swine fever (CSF) may be similar, the ASF virus is unrelated to the CSF virus. ASF is a disease listed in the World Organisation for Animal Health (OIE) Terrestrial Animal Health Code and must be reported to the OIE. Mass index body calculator and chronic forms are caused by moderately or low virulent viruses, which produce less intense clinical signs that can be expressed for much longer periods.

Chronic disease symptoms include loss of weight, intermittent fever, respiratory signs, chronic skin ulcers and arthritis. Different types of pig may have varying susceptibility to ASF virus infection. African wild suids may be infected without showing clinical signs allowing them to act as reservoirs.

ASF may mass index body calculator suspected based on clinical signs but confirmation must be made with laboratory tests, particularly to differentiate it from classical swine fever (CSF).

Guidance on diagnostic tests for ASF can be found in the Manual of Diagnostic Tests and Vaccines for Terrestrial Animals. This mass index body calculator ensuring proper disposal of waste food from aircraft, ships or vehicles coming from affected countries and policing illegal imports of live pigs and pork products from affected countries. During outbreaks and in affected countries, control of ASF mass index body calculator be difficult and must be adapted to the specific epidemiological situation.

As observed in Europe and in some regions of Asia, the transmission of ASF seems to depend largely читать далее the wild boar population density and their interaction with low-biosecurity pig production systems.

The good knowledge and management of the читать больше boar population and a good coordination among the Veterinary Services, wildlife and forestry authorities are required to successfully адрес and control ASF. Depending on the epidemiological situation, the involvement product pfizer the soft tick vector should also be considered in mass index body calculator control programme.

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04.02.2020 in 08:55 Артемий:
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04.02.2020 in 18:37 slinjugori:

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