Wednesday, August 29, 2018

PRO/AH/EDR> Tilapia syncytial hepatitis - Mexico: OIE

TILAPIA SYNCYTIAL HEPATITIS - MEXICO: OIE
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International Society for Infectious Diseases
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Date: Sat 25 Aug 2918
Source: OIE, WAHID (World Animal Health Information Database), weekly
disease information 2018; 31(35) [edited]
<http://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=27650>


Tilapia lake virus, Mexico
--------------------------
Information received on [and dated] 25 Aug 2018 from MVZ Joaquín
Braulio Delgadillo Alvarez, [Director General of Animal Health,
National Agro-Alimentary Health, Safety and Quality Service (SENASICA)
Secretariat/Ministry of Agriculture, Livestock, Rural Development,
Fisheries, and Food] Mexico, Mexico

Summary
Report type: immediate notification
Date of start of the event: 4 Jul 2018
Date of confirmation of the event: 31 Jul 2018
Report date: 25 Aug 2018
Reason for notification: emerging disease
Morbidity: 1 (scale 0 to 5)
Mortality: 1 (scale 0 to 5)
Zoonotic impact: no
Causal agent: Tilapia lake virus (TiLV)

New outbreaks (20)
[The 20 outbreaks of TiLV occurred in the following states: Chiapas
(5), Jalisco (1), Michoacán (1), Sinaloa (2), Tabasco (8), and
Veracruz (3). See details of each outbreak at the source URL above. -
Mod.CRD]

Summary of outbreaks
Total outbreaks: 20
Total animals affected:
Species / Susceptible / Cases / Deaths / Killed and disposed of /
Slaughtered
Tilapia (_Oreochromis niloticus_) / 7 181 077 / 244 065 / 243 900 / 0
/ 0

Outbreak statistics [rates apparent, expressed as percentages]
Species / Apparent morbidity rate / Apparent mortality rate / Apparent
case fatality rate / Proportion susceptible animals lost*
Tilapia (_Oreochromis niloticus_) / 3.40 / 3.40 / 99.93 / 3.40

*Removed from the susceptible population through death, destruction,
and/or slaughter

Epidemiology
Source of the outbreak(s) or origin of infection: unknown or
inconclusive
Epidemiological comments: During the active surveillance carried out
by the veterinary authorities together with the State Aquaculture
Health Committees, tilapia lake virus was detected by molecular
biology techniques in 20 aquaculture production units (APU) out of a
national registry of 2,884 tilapia producers. The affected APU are
located in some localities of six states of the country (Chiapas,
Jalisco, Michoacán, Sinaloa, Tabasco and Veracruz). In order to
protect national production, strategies were agreed with producers,
technicians, researchers and industry representatives to raise
biosafety levels, namely: good production, cleaning, washing and
disinfecting practices of premises, equipment and means of transport
and avoid movement, import and export of animals with suspected
disease.

Control measures
Measures applied: movement control inside the country, surveillance
outside infected and/or protection zone, quarantine, vaccination
prohibited, no treatment of affected animals
Measures to be applied: emergency harvest, disinfection

Diagnostic test results
Laboratory name and type / Species / Test / Test date / Result
SENASICA laboratory (biosafety level 3) (national laboratory) /
Tilapia (_Oreochromis niloticus_) / real-time PCR / 31 Jul 2018 /
Positive
SENASICA laboratory (biosafety level 3) (national laboratory) /
Tilapia (_Oreochromis niloticus_) / virus sequencing / 2 Aug 2018 /
Positive

Future reporting
The event is continuing. Weekly follow-up reports will be submitted.

[The location of the outbreaks can be seen on the interactive map
included in the OIE report at the source URL above.]

--
Communicated by:
ProMED-mail
<promed@promedmail.org>

["Tilapines, comprising more than 100 species, are the 2nd most
important group of farmed fish worldwide after carp. Global production
is estimated at 4.5 million metric tons with a current value in excess
of USD 7.5 billion. In some regions they are ecologically important
(algae and mosquito control and habitat maintenance for shrimp
farming) and an important wild capture species. Introduction of the
virus has been shown to cause significant mortality (up to 90 percent)
and thus result in serious economic losses to both farmers and
fishers.

"TiLV has been reported in Colombia, Ecuador, and Israel, and most
recently, Egypt, Thailand, India, Malaysia, and the Philippines.
However, a lack of thorough investigation of all mortality incidents
means that the geographic distribution of TiLV may be wider than
currently. For example, reports of mortality in tilapia in Ghana and
Zambia in 2016 have not been attributed to TiLV but the available
information does not indicate that the presence of the virus has been
investigated. A partial genome from Thailand showed relatively high
variation to strains from Israel (around 97 percent nucleotide
identity)."

OIE's disease card on the emerging 'Tilapia lake virus' (TiLV) is
available at
<http://www.oie.int/fileadmin/Home/eng/Internationa_Standard_Setting/docs/pdf/Aquatic_Commission/A_TiLV_disease_card.pdf>.
- Mod.CRD

HealthMap/ProMED-mail map of Mexico:
<http://healthmap.org/promed/p/14>]

[See Also:
Tilapia syncytial hepatitis - Peru: (PI) OIE
http://promedmail.org/post/20180301.5658787
2017
----
Tilapia syncytial hepatitis - Philippines: (BU) OIE
http://promedmail.org/post/20171124.5463998
Tilapia syncytial hepatitis: Malaysia, Thailand, emerging disease, OIE
http://promedmail.org/post/20170926.5342212
Tilapia syncytial hepatitis - Taiwan (03): (Taoyuan) update
http://promedmail.org/post/20170710.5163223
Tilapia syncytial hepatitis - Taiwan (02): (Taoyuan City) emerging
disease, spread http://promedmail.org/post/20170620.5118988
Tilapia syncytial hepatitis - Taiwan: (Taoyuan City) emerging disease,
OIE http://promedmail.org/post/20170614.5105570
Tilapia syncytial hepatitis - Israel (02): (HZ) emerging disease, OIE,
follow-up http://promedmail.org/post/20170605.5084485
Tilapia syncytial hepatitis - worldwide: FAO, alert
http://promedmail.org/post/20170528.5067919
Tilapia syncytial hepatitis - Israel: (HZ) emerging disease, OIE
http://promedmail.org/post/20170524.5059646
2015
----
Novel RNA virus - Israel: tilapia, lethal
http://promedmail.org/post/20150127.3122740
2012
----
Undiagnosed disease, fish - Israel: (HZ), blindness, RFI
http://promedmail.org/post/20120731.1223207
2011
----
Undiagnosed disease, fish - Israel: (HZ), blindness, RFI
http://promedmail.org/post/20111028.3213
2006
----
Undiagnosed tilapia die-off - Nicaragua (Coco River), RFI
http://promedmail.org/post/20060211.04]
.................................................crd/mj/dk
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