Swine
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Swine
The disease is spread by mosquitoes that causes the abnormal sperm production of boar and the reproductive disorders of the pregnant sows. Mainly occurs in the mosquitoes season at august, miscarriage and stillbirth of infected pigs is most often between August to November. Mainly occur in gilt than sow. Japanese encephalitis is a viral disease that is important zoonosis because people are infected even cause encephalitis public health and sanitation.
1. Agent
Togaviridae, Flavivirus(Japanes B encephalitis virus, JEV)
enveloped RNA virus, inactivated at 56℃ for 30minutes.
2. Epidemiology
Infection can extend the time period and winter activities such as mosquitoes due to the atmospheric temperature rise is widely spread in the beginning of June until the end of November.
3. Clinical Signs
A virus has invaded the body and multiply in the internal organ and cause viremia. This light does not indicate the heating be as any symptoms at this time. Some of the piglets of the infected sows are delivered one seems to die is characterized by neurological symptoms such as convulsions, paralysis, turning movements. When the boar is infected with impaired sperm production functions arose mate heat decay, congestive scrotum is inflamed or swollen testicles to the upper body is stiff, reduced sperm count, sperm deformity wake of increased fertility falls significantly. Sows miscarriage and stillbirth rate is different depending on the time of infection.
4. Prevention
1) Prevention
Thoroughly clean the outside and inner part of nursery not to be generated and formatted to prevent mosquitoes to carry out periodic disinfection is recommended that a thorough sanitation .
2) Vaccination
JE live vaccine encephalitis before mosquitoes occur (March~June) conducted twice vaccinated sows and boar on a monthly intervals. When the first. second inoculation is been done before April, it is preferable to carry out the third inoculation at August.
1. Agent
Togaviridae, Flavivirus(Japanes B encephalitis virus, JEV)
enveloped RNA virus, inactivated at 56℃ for 30minutes.
2. Epidemiology
Infection can extend the time period and winter activities such as mosquitoes due to the atmospheric temperature rise is widely spread in the beginning of June until the end of November.
3. Clinical Signs
A virus has invaded the body and multiply in the internal organ and cause viremia. This light does not indicate the heating be as any symptoms at this time. Some of the piglets of the infected sows are delivered one seems to die is characterized by neurological symptoms such as convulsions, paralysis, turning movements. When the boar is infected with impaired sperm production functions arose mate heat decay, congestive scrotum is inflamed or swollen testicles to the upper body is stiff, reduced sperm count, sperm deformity wake of increased fertility falls significantly. Sows miscarriage and stillbirth rate is different depending on the time of infection.
| Infection (pregnancy) Time | Abortion and Stillbirth Rate (%) |
| Early ( < 30day) | about 18% (fetus absorption, repeat heat) |
| Middle (30∼80day) | 39% (mummy) |
| Late (>80day) | 14%(stillbirth, fetus hydrocephalosis, weak fetus showing neurological signs) |
4. Prevention
1) Prevention
Thoroughly clean the outside and inner part of nursery not to be generated and formatted to prevent mosquitoes to carry out periodic disinfection is recommended that a thorough sanitation .
2) Vaccination
JE live vaccine encephalitis before mosquitoes occur (March~June) conducted twice vaccinated sows and boar on a monthly intervals. When the first. second inoculation is been done before April, it is preferable to carry out the third inoculation at August.
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