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Teschovirus encephalomyelitis in the Republic of Haiti (previously enterovirus encephalomyelitis or Teschen/Talfan disease)

No. 4 - 2009












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    Newsletter
    Encefalomielitis por enterovirus en la República de Haití­ (ex-enfermedad de teschen)
    No. 4 - 2009
    2009
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    Esta enfermedad fue descrita por primera vez en 1929 en Checoslovaquia, en la ciudad de Teschen (por lo que fue previamente conocida como "Enfermedad de Teschen"). Durante los años 40 y 50 se extendió por toda Europa, seguido de Canadá, Estados Unidos, Australia y fi talmente Uganda y Madagascar, causando enormes pérdidas para la industria porcina. La forma clí­nica de la enfermedad es poco frecuente, aunque las evidencias serológicas indican que en las poblaciones de cerdos circulan variantes d el virus de baja virulencia.
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    Article
    Longitudinal Analysis of Influenza A(H5) Sero-Surveillance in Myanmar Ducks, 2006–2019 2021
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    Between 2006 and 2019, serological surveys in unvaccinated domestic ducks reared outdoors in Myanmar were performed, using a haemagglutination inhibition (HI) test, to confirm H5 avian influenza virus circulation and assess temporal and spatial distribution. Positive test results occurred every year that samples were collected. The annual proportion of positive farms ranged from 7.1% to 77.2%. The results revealed silent/sub-clinical influenza A (H5) virus circulation, even in years and States/Regions with no highly pathogenic avian influenza (HPAI) outbreaks reported. Further analysis of the 2018/19 results revealed considerable differences in seroconversion rates between four targeted States/Regions and between years, and showed seroconversion before and during the sampling period. By the end of the trial, a high proportion of farms were seronegative, leaving birds vulnerable to infection when sold. Positive results likely indicate infection with Gs/GD/96-lineage H5Nx HPAI viruses rather than other H5 subtype low-pathogenicity avian influenza viruses. The findings suggested persistent, but intermittent, circulation of Gs/GD/96-lineage H5Nx HPAI viruses in domestic ducks, despite the veterinary services’ outbreak detection and control efforts. The role of wild birds in transmission remains unclear but there is potential for spill-over in both directions. The findings of this study assist the national authorities in the design of appropriate, holistic avian influenza control programs.
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    Document
    Avian Influenza Disease Emergency: issue No. 17 (29/06/2004)
    Update of the Avian Influenza situation (As of 29/06/2004)
    2004
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    Viet Nam: Ongoing surveillance for HPAI included the testing of over 10 000 poultry samples taken from various parts of the country. Results have shown that many were positive for H5 virus (27/06/04 Source: AFP, GPHIN). More information would be required regarding the presence or absence of clinical signs and type of test used for serology, virus isolation and pathological findings. Sound surveillance activities are of utmost importance to determine which areas would be appropriate for restockin g or to institute additional control measures. USA (H7N3): National Veterinary Services Laboratory (NVSL) confirmed that a flock of 14 birds in Hopkins County, Texas, was infected with H7N3 on 22/06/04. The farm is located some seven kilometres from the depopulated commercial operations that tested positive for the H7N3 strain of AI on routine blood tests in mid-May (The AI virus was not isolated in subsequent laboratory tests). This infected non-commercial flock had retested as negat ive over two weeks ago. Commercial or non-commercial flocks in the area are to be retested as part of an ongoing active surveillance programme. (23/06/04 Source: Texas Animal Health Commission NEWS RELEASE; FAO)

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