EurekaMag.com logo
+ Translate

Epidemiological studies on swine japanese encephalitis in south korea 1. epizootic patterns of japanese encephalitis in pigs


, : Epidemiological studies on swine japanese encephalitis in south korea 1. epizootic patterns of japanese encephalitis in pigs. Bulletin of Azabu University Veterinary Medicine 1(2): 241-256

During a 2 yr period from 1968 and 1969, the incidence of Japanese encephalitis (JE) virus infections in pigs in South Korea was studied by seroepidemiological and virological investigations. The meteorological aspect was also surveyed. Antibody responses to JE virus in pigs were first observed between mid June and early Aug., and these positive rates were significantly different according to the serum specimens collected from pigs in different years and in various districts. In 1969, the response generally appeared later and at a lower level compared with that in 1968 and did not occur simultaneously even in the same litters. According to the monthly data of the maximum and minimum temperatures and rainfall in Junbuk-do, difference in variation of temperature was not recognized between both years, but the amount of rainfall was significantly prevalent in 1969. Almost all river basins were unsuitable for the reproduction of mosquitoes, because they were continuously full of running water in the summer of 1969. Outbreaks of abortion in sows were recognized as follows; the first case occurred in 6 primary pregnant sows of a farm in Anyang area, Gyunggi-do, during Jan. and Feb., 1969. New-borns (51) or fetuses, 49 (96.1%) were stillborn or died within 5 days after parturition. These abortions and stillbirths were considered to have been caused by epizootic field viruses in 1968. Two JE viral strains [Anyang (ASF-M) and Anyang (ASF-C)] were isolated from stillborn fetuses. The 2nd case appeared in primary pregnant sows from a farm in the Sosa area, Gyunggi-do, during June-Sept., 1969. These 5 litters showed 71.9% (23/32) mortality within 5 days after parturition. Three JE viral strains [Sosa (ASF-M1), Sosa (ASF-M2) and SOsa (ASF-C)] were also isolated from stillborn fetuses.

(PDF 0-2 workdays service)

Accession: 005375506

Submit PDF Full Text: Here


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Related references

Cho, K.S., 1980: Epidemiological studies on swine Japanese encephalitis in the Republic of Korea. I. Epizootic patterns of Japanese encephalitis in pigs. II. Relationship between prevalent virus strains and their epizootic patterns. Antibody responses to JE virus in pigs were studied in the years 1968 and 1969, and correlations sought with the weather patterns for those years. Antibody responses were first observed between mid-June and early August. They were later and weaker...

Cho, K.S., 1980: Epidemiological studies on swine japanese encephalitis in south korea 2. relationship between prevalent virus strains and their epizootic patterns. Newly isolated Japanese encephalitis (JE) viral strains were investigated by biological, physicochemical and serological tests, and by the experimental infection tests in mice and piglets. Relationships between viral characteristics and epizootic...

Cho, K.S.; Kwon, K.M.; Kim, Y.H., 1970: Epidemiological studies on Japanese encephalitis in pigs. I. A survey of antibodies, abortion, and stillbirth due to Japanese encephalitis virus in pigs. Monthly surveys from March to December in 1968 and 1969 showed that previously unexposed pigs started to develop antibodies to Japanese encephalitis virus in May and that 80% (in 1969) to 100% (in 1968) had antibodies by September-October. All the...

Uchida, Y., 1968: Immuno-sero-epidemiological studies on Japanese encephalitis. II. Hemagglutination inhibition and neutralizing antibodies against Japanese encephalitis virus in slaughtered swine bred in various districts of Kumamoto prefecture, in 1966 and 1967. Kumamoto Igakkai Zasshi. Journal of the Kumamoto Medical Society 42(8): 605-630

Tadano, M.; Kanemura, K.; Hasegawa, H.; Makino, Y.; Fukunaga, T., 1994: Epidemiological and ecological studies of Japanese encephalitis in Okinawa, subtropical area in Japan. I. Investigations on antibody levels to Japanese encephalitis virus in swine sera and vector mosquito in Okinawa, Miyako and Ishigaki islands. From 1985 to 1989, serum specimens of swine raised in the northern, central and southern areas in Okinawa island were examined for Japanese encephalitis (JE) virus antibody by ELISA and hemagglutination-inhibition test. The antibody positive rate...

Ogata, M.; Nagao, Y.; Jitsunari, F.; Kitamura, N., 1969: Vaccination with complete adjuvant-added inactivated virus vaccine of Japanese encephalitis to swine, rabbits and chicks for preventing viremia (epidemiological study on Japanese encephalitis 25). Acta Medicinae Okayama 23(6): 541-551

Ogata, M.; Osaki, H., 1970: Forecasting median and mode dates of prevalence of Japanese encephalitis patients by electronic computer (epidemiological studies on Japanese encephalitis, 31). Acta Medicinae Okayama 24(3): 343-353

Furu, Y., 1977: Epidemiological studies of japanese encephalitis in shiga prefecture 1965 1973 part 3 study of host animal range for japanese encephalitis virus. Sera were collected from wild herons, rats, snakes, lizards and domestic fowl [in Shiga Prefecture, Japan]. Antibody-free dogs and rabbits, placed at 2 points as sentinels, were bled biweekly for 2 yr. The presence of hemagglutination inhibition (...

Uchida, Y., 1968: Immuno-sero-epidemiological studies on Japanese encephalitis. I. Neutralizing and hemagglutination inhibition antibodies against Japanese encephalitis virus in healthy children from Kumamoto. Kumamoto Igakkai Zasshi. Journal of the Kumamoto Medical Society 42(8): 582-604

Cho K.S.; Kwon K.M.; Kim Y.H., 1970: Studies on epizootiological survey of japanese encephalitis in swine part 1 the survey on hem agglutination inhibition antibody and abortion and stillbirth of japanese encephalitis virus in swine. Research Reports of the Office of Rural Development (Veterinary) (Suweon) 13: 59-66