Mexico - Outbreaks of Aujeszky’s disease in backyard pigs, Guerrero, Tamaulipas, Nayarit

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Aujeszky’s disease, Mexico

Information received on 15/10/2019 from Dr. Juan Gay Guti?rrez, Director General de Salud Animal, Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA), Secretar?a de Agricultura y Desarrollo Rural (SADER), Ciudad de Mexico, Mexico

Summary Report type Immediate notification Date of start of the event 27/08/2019 Date of confirmation of the event 24/09/2019 Report date 14/10/2019 Date submitted to OIE 15/10/2019 Reason for notification Recurrence of a listed disease Date of previous occurrence 09/2015 Manifestation of disease Sub-clinical infection Causal agent Aujeszky's disease virus Nature of diagnosis Laboratory (advanced) This event pertains to a defined zone within the country

New outbreaks (5)

Outbreak 1 Teloloapan, Guerrero Date of start of the outbreak 27/08/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 147 4 0 0 0 Affected population As part of the active epidemiological surveillance, a rural farm with 147 pigs that did not show clinical signs gave positive serological results for Aujeszky's disease.

Outbreak 2 Jaumave, Tamaulipas Date of start of the outbreak 05/09/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 5 1 0 0 0 Affected population As part of the active epidemiological surveillance, a backyard with five pigs that did not show clinical signs gave positive serological results for Aujeszky's disease.

Outbreak 3 Mainero, Tamaulipas Date of start of the outbreak 05/09/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 6 1 0 0 0 Affected population As part of the active epidemiological surveillance, a backyard with six pigs that did not show clinical signs gave positive serological results for Aujeszky's disease.

Outbreak 4 Mainero, Tamaulipas Date of start of the outbreak 05/09/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 8 1 0 0 0 Affected population As part of the active epidemiological surveillance, a backyard with eight pigs that did not show clinical signs gave positive serological results for Aujeszky's disease.

Outbreak 5 Jaumave, Tamaulipas Date of start of the outbreak 05/09/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 7 1 0 0 0 Affected population As part of the active epidemiological surveillance, a backyard with sevenpigs that did not show clinical signs gave positive serological results for Aujeszky's disease.

Summary of outbreaks Total outbreaks: 5 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 173 8 0 0 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Swine 4.62% 0.00% 0.00% 0.00% *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 As part of the active epidemiological surveillance, the serological presence of Aujeszky's disease was detected in four backyards in Tamaulipas State and in one pig farm in Guerrero State without clinical signs. In all five outbreaks, ELISA and serological neutralization test results were positive. So far, the virus has not been isolated. Producers in the area were advised to immediately inform official veterinarians of the presence of characteristic signs of the disease and to avoid the movement of pigs and the introduction of herds presenting a risk in the area.

Control measures Measures applied Movement control inside the country Surveillance outside containment and/or protection zone Surveillance within containment and/or protection zone Quarantine Vaccination permitted (if a vaccine exists) No treatment of affected animals Measures to be applied Official disposal of carcasses, by-products and waste Disinfection Slaughter Ante and post-mortem inspections

Diagnostic test results Laboratory name and type Species Test Test date Result SENASICA level 3 Biosafety Laboratory (National laboratory) Swine enzyme-linked immunosorbent assay (ELISA) 18/09/2019 Positive SENASICA level 3 Biosafety Laboratory (National laboratory) Swine seroneutralization test (SNT) 24/09/2019 Positive

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

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https://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=32090

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Aujeszky’s disease, Mexico

Information received on 14/12/2019 from Dr. Gay Guti?rrez Juan, Director General de Salud Animal, Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA), Secretar?a de Agricultura y Desarrollo Rural (SADER), Ciudad de Mexico, Mexico

Summary Report type Follow-up report No. 3 Date of start of the event 27/08/2019 Date of confirmation of the event 24/09/2019 Report date 13/12/2019 Date submitted to OIE 14/12/2019 Reason for notification Recurrence of a listed disease Date of previous occurrence 09/2015 Manifestation of disease Sub-clinical infection Causal agent Aujeszky's disease virus Nature of diagnosis Laboratory (advanced) This event pertains to a defined zone within the country Related reports Immediate notification (14/10/2019) Follow-up report No. 1 (23/10/2019) Follow-up report No. 2 (08/11/2019) Follow-up report No. 3 (13/12/2019)

New outbreaks (6)

Outbreak 1 Jaumave, Tamaulipas Date of start of the outbreak 31/10/2019 Outbreak status Resolved (27/11/2019) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 6 3 0 6 0 Affected population Derived from epidemiological sampling around the outbreak, a backyard was identified with a population of six pigs with Aujeszky's disease, which did not show clinical signs.

Outbreak 2 Jaumave, Tamaulipas Date of start of the outbreak 31/10/2019 Outbreak status Resolved (27/11/2019) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 3 1 0 3 0 Affected population Derived from epidemiological sampling around the outbreak, a backyard was identified with a population of three pigs with Aujeszky's disease, which did not show clinical signs.

Outbreak 3 Teloloapan, Guerrero Date of start of the outbreak 01/11/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 13 5 0 0 0 Affected population Derived from epidemiological sampling around the outbreak, a backyard was identified with a population of thirteen pigs with Aujeszky's disease, which did not show clinical signs.

Outbreak 4 Teloloapan, Guerrero Date of start of the outbreak 01/11/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 8 1 0 0 0 Affected population Derived from epidemiological sampling around the outbreak, a backyard was identified with a population of eight pigs with Aujeszky's disease, which did not show clinical signs.

Outbreak 5 Teloloapan, Guerrero Date of start of the outbreak 01/11/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 5 1 0 0 0 Affected population Derived from epidemiological sampling around the outbreak, a backyard was identified with a population of five pigs with Aujeszky's disease, which did not show clinical signs.

Outbreak 6 Teloloapan, Guerrero Date of start of the outbreak 05/11/2019 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 13 1 0 0 0 Affected population Derived from epidemiological sampling around the outbreak, a backyard was identified with a population of thirteen pigs with Aujeszky's disease, which did not show clinical signs.

Summary of outbreaks Total outbreaks: 6 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 48 12 0 9 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Swine 25.00% 0.00% 0.00% 18.75% *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 Derived from epidemiological sampling around the outbreak, Aujeszky's disease was detected in two backyards in the state of Tamaulipas and in four backyards in the state of Guerrero. In all six outbreaks, seroneutralisation tests resulted positive. None of the pigs showed clinical signs. Producers in the area were advised to immediately notify the official veterinarian of the presence of signs of the disease. It was also recommended to avoid the movement of pigs and the introduction of herds that represent a risk.

Control measures Measures applied Movement control inside the country Surveillance outside containment and/or protection zone Surveillance within containment and/or protection zone Quarantine Vaccination permitted (if a vaccine exists) No treatment of affected animals Measures to be applied Official disposal of carcasses, by-products and waste Stamping out Disinfection

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

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https://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=32631

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Aujeszky’s disease, Mexico

Information received on 30/01/2020 from Dr. Gay Guti?rrez Juan, Director General de Salud Animal, Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA), Secretar?a de Agricultura y Desarrollo Rural (SADER), Ciudad de Mexico, Mexico

Summary Report type Follow-up report No. 6 (Final report) Date of start of the event 27/08/2019 Date of confirmation of the event 24/09/2019 Report date 30/01/2020 Date submitted to OIE 30/01/2020 Date event resolved 18/01/2020 Reason for notification Recurrence of a listed disease Date of previous occurrence 09/2015 Manifestation of disease Sub-clinical infection Causal agent Aujeszky's disease virus Nature of diagnosis Laboratory (advanced) This event pertains to a defined zone within the country Related reports Immediate notification (14/10/2019) Follow-up report No. 1 (23/10/2019) Follow-up report No. 2 (08/11/2019) Follow-up report No. 3 (13/12/2019) Follow-up report No. 4 (18/12/2019) Follow-up report No. 5 (17/01/2020) Follow-up report No. 6 (30/01/2020)

New outbreaks (6)

Outbreak 1 Del Nayar, Nayarit Date of start of the outbreak 19/12/2019 Outbreak status Resolved (17/01/2020) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 11 3 0 11 0 Affected population Following the epidemiological sampling around the outbreak, a backyard was identified with a population of 11 pigs serologically positive to Aujeszky's disease but without clinical signs.

Outbreak 2 Del Nayar, Nayarit Date of start of the outbreak 19/12/2019 Outbreak status Resolved (17/01/2020) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 5 2 0 5 0 Affected population Following the epidemiological sampling around the outbreak, a backyard was identified with a population of 5 pigs serologically positive to Aujeszky's disease but without clinical signs.

Outbreak 3 Del Nayar, Nayarit Date of start of the outbreak 19/12/2019 Outbreak status Resolved (18/01/2020) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 9 5 0 9 0 Affected population Following the epidemiological sampling around the outbreak, a backyard was identified with a population of 9 pigs serologically positive to Aujeszky's disease but without clinical signs.

Outbreak 4 Del Nayar, Nayarit Date of start of the outbreak 19/12/2019 Outbreak status Resolved (17/01/2020) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 12 2 0 12 0 Affected population Following the epidemiological sampling around the outbreak, a backyard was identified with a population of 12 pigs serologically positive to Aujeszky's disease but without clinical signs.

Outbreak 5 Del Nayar, Nayarit Date of start of the outbreak 19/12/2019 Outbreak status Resolved (17/01/2020) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 10 2 0 10 0 Affected population Following the epidemiological sampling around the outbreak, a backyard was identified with a population of 10 pigs serologically positive to Aujeszky's disease but without clinical signs.

Outbreak 6 Del Nayar, Nayarit Date of start of the outbreak 19/12/2019 Outbreak status Resolved (18/01/2020) Epidemiological unit Backyard Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 8 2 0 8 0 Affected population Following the epidemiological sampling around the outbreak, a backyard was identified with a population of 8 pigs serologically positive to Aujeszky's disease but without clinical signs.

Summary of outbreaks Total outbreaks: 6 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Swine 55 16 0 55 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Swine 29.09% 0.00% 0.00% 100.00% *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 Following epidemiological sampling around the outbreaks in the State of Nayarit, pigs with positive serology for Aujeszky's disease were detected in six backyards in the municipality of El Nayar. The pigs identified had no clinical signs. In the 6 outbreaks, serum neutralisation tests were positive and the virus was not isolated. All the pigs with positive serology and their contacts have been killed and no more infected animals or cases of the disease have been detected in the affected municipalities of the States of Tamaulipas, Guerrero and Nayarit. Therefore, in accordance with Article 8.2.4.3a of the Terrestrial Animal Health Code, this event is considered closed.

Control measures Measures applied Movement control inside the country Surveillance outside containment and/or protection zone Surveillance within containment and/or protection zone Quarantine Official disposal of carcasses, by-products and waste Stamping out Disinfection Vaccination permitted (if a vaccine exists) No treatment of affected animals Measures to be applied No other measures

Future Reporting The event is resolved. No more reports will be submitted.

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https://www.oie.int/wahis_2/public/wahid.php/Reviewreport/Review?page_refer=MapFullEventReport&reportid=33083