Tuesday, August 21, 2018

PRO/AH/EDR> Avian influenza (93): Russia (KT) poultry, HPAI H5N2, alert

AVIAN INFLUENZA (93): RUSSIA (KOSTROMA) POULTRY, HPAI H5N2, ALERT
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Date: Mon 20 Aug 2018, 6:33 PM
Source: Agriland (UK) [summ., edited]
<https://www.agriland.co.uk/farming-news/bird-flu-confirmed-on-russian-500000-bird-farm/>


Russian authorities have confirmed an outbreak of avian influenza on a
500 000-bird commercial farm in Kostromskaya, a region to the
north-west of the country.

According to the disease report, sequencing analysis showed the virus
(H5N2) belonged to the Asian strain which has been detected in
multiple wild bird and poultry cases across Asia, Africa and Europe
since 2014.

There have been no human cases associated with H5N2 HPAI (highly
pathogenic avian influenza) infection in areas where it circulates.

The latest outbreak of H5N2 HPAI is overlapped by 3 migration flyways
- the Central Asian, the West Asian and the East Atlantic and it is
this flyway which also brings wild migratory waterfowl to the UK.

Therefore, as the autumn migration season approaches, the risk to the
UK will start to increase. If wild birds are involved in the
long-distance movement of the virus, poultry farms in north-east and
north-west Europe may be at risk in the coming months.

Since early June [2018], 67 outbreaks of H5 have been reported in
commercial poultry across several regions of western Russia. However,
in backyard flocks there is no information on the full strain
identification.

If Russia's outbreaks are all caused by the H5N2 HPAI virus and if
this virus is not poultry-adapted and therefore can jump into wild
waterfowl, then migratory waterfowl may have only partial immunity if
they were exposed to H5N6 HPAI last year or H5N8 HPAI in the previous
year.

A Defra spokesman said: "We strongly recommend that all poultry
keepers - including backyard keepers - should familiarise themselves
with government guidance on good biosecurity and how to report
suspicion of disease appropriately."

[Byline: Rachel Martin]
--
Communicated by:
ProMED-mail
<promed@promedmail.org>

[The Russian HPAI H5N2 recent outbreak on a commercial poultry farm in
Kostroma, addressed in the above report, was reported to the OIE on 16
Aug 2018 (see http://promedmail.org/post/20180818.5972764). Out of 498
485 susceptible birds, 506 died (reported as "cases"), 1223 were
"killed and disposed of"; no stamping out applied.

The following commentary was included in the above reported "immediate
notification": "The virus isolate was identified as H5N2 subtype by
PCR and nucleotide sequencing. The comparative analysis of the
obtained nucleotide sequences of the H gene and N gene fragments
revealed that the isolate belongs to the Asian genetic lineage of
highly pathogenic avian influenza (Clade 2.3.4.4.) which spread in the
Russian Federation as well as in Asian, European, Middle Eastern and
African countries in 2016-2018. The hemagglutinin cleavage site has a
-REKRRKRGLF- structure, characterizing the virus as potentially highly
virulent".

DEFRA's message, and their advice to all UK poultry keepers -- with
special reference to backyard keepers --, to apply good biosecurity
and to report suspicion of disease appropriately, deserves to be
followed throughout the EU and Europe at large. - Mod.AS]

[See Also:
Avian influenza (92): Russia (KT) poultry, HPAI H5N2, OIE
http://promedmail.org/post/20180818.5972764
2017
----
Avian influenza (181): Russia (KT) poultry, HPAI H5N2, OIE]
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