AI surveillance of domestic birds in Vietnam. Under the OIE/Japan Trust Fund Project (JTF) for Strengthening HPAI Control in Asia,
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1 AI surveillance of domestic birds in Vietnam Under the OIE/Japan Trust Fund Project (JTF) for Strengthening HPAI Control in Asia, Kenji Sakurai, OIE Asia-Pacific Tokyo, December 2012
2 Contents 1. Background information H5N1 HPAI situation in Asia Poultry production and marketing systems in Asia 2. AI virus prevalence studies on backyard farms and Live bird markets in Vietnam 2
3 Contents 1. Background information H5N1 HPAI situation in Asia Poultry production and marketing systems in Asia 2. AI virus prevalence studies on backyard farms and live bird markets in Vietnam 3
4 Bangladesh Bhutan Cambodia PR China Indonesia India Japan RO Korea Laos Malaysia Mongolia Myanmar Nepal Pakistan Thailand Vietnam Occurrences of H5N1 HPAI outbreaks in Asia
5 H5N1 HPAI status in Asia H5N1 status East Asia Southeast Asia South Asia 1. Persistent PR China 2. Sporadic 3. Intermittent introduction 4. No report since 2009 Japan (2011) Indonesia Vietnam Cambodia Laos Myanmar Bangladesh India Nepal RO Korea (2011) Bhutan (2012) Mongolia (2010) Malaysia (2008) Thailand (2008) Pakistan (2009) 5. Never reported C. Taipei Philippines Singapore Brunei Maldives Sri Lanka Figure in parenthesis: year of the last H5N1 case 5
6 Critical factors for the H5N1 control in Asia Performance of Veterinary Services Poultry production and marketing systems Movement of poultry and poultry products Migratory birds Vaccination 6
7 Characteristics of poultry production and marketing systems in Asia 1. Large duck population 2. Small scale/household production systems 3. Poultry production systems integrated with rice production systems (Free ranging ducks) 4. live bird (poultry) marketing systems Poultry production and marketing systems in Asia can provide a suitable and comfortable condition for H5N1 virus to circulate in ecosystems. 7
8 Duck population Asia is home to 90% of world duck population. China and Vietnam are home to 80% of duck population in Asia. Ducks do not always manifest clinical signs when they get infected with H5N1 virus. Source:FAO(2010) Unit:hundred million 8
9 Small scale farms Poultry production in Asia relies on small scale production systems including household backyard farms % of total number of poultry in Asia is raised in small scale farms. Low bio-security Different species 9
10 Small scale farms Duck production systems are embedded in rice production systems in Asia. Free ranging ducks 10
11 Live poultry marketing systems (LBMs) Live bird markets (LBMs) are ubiquitous and integral part of poultry marketing systems in most of developing countries in Asia. LBMs are a preferred place for the locals to purchase poultry or freshly killed poultry for consumption. LBMs are situated close proximity to residential areas in a city, village or community. 11
12 Main issues of live bird/poultry markets 1. Poultry from multiple producers (mainly small scale farms) 2. Different species of poultry 3. Selling live poultry and slaughtering/cutting process in the same area 4. Lack of appropriate hygiene practice (no clean and disinfection) 5. No sanitation systems (wastewater treatment/disposal) 6. People take poultry live. 7. Overnight poultry (leftover poultry) 12
13 Some features of live bird/poultry markets
14 Key roles of LBMs in AIV infection Retail LBMs are a dead-end for poultry, but not a dead-end for the virus! 1. LBMs can maintain, amplify and disseminate AIVs and may allow the viruses to persist there for a long period of time. 2. LBMs can serve as a source of infection for farms, because the virus transmission from LBMs to farms may occur through movement of humans, live poultry, contaminated poultry meat and materials/equipment. 3. LBMs possibly help maintain infection in poultry flocks and provide a potential site for intervening to control virus transmission. 14
15 1. Background information Contents H5N1 HPAI situation in Asia Poultry production and marketing systems in Asia 2. AI virus prevalence studies on backyard farms and live poultry markets in Vietnam 15
16 Areas studied in Vietnam Time South North st (April) 2 nd (March) 3 rd (October) 4 th (February) 5 th (October) 6 th (February) 7 th (October) 1 st (March) 2 nd (January) 3 rd (September) 4 th (April) 5 th (August) 16
17 AI virus studies and analyses Target AIV: Influenza A virus (H1-H16) Testing flow: 1. Real time PCR (5 birds in 1 pool) 2. LAMP (5 birds in 1 pool) (Loop-mediated Isothermal Amplification) 3. Virus isolation 4. Genetic analysis (DNA Sequencing) 5. Serological studies 6. Others Vietnam Japan Public Database: (1) GenBank/EMBL/DDBJ (2) Hokkaido Univ. Influenza Database System 17
18 Methodology :Sample collection Sample scale Main target species Sample category Surveyed site Others 600 head Duck, Muscovy 2 swabs (Cloacal & tracheal) 15 Backyards (20 head/premise) 15 LBMs (20 head/premise) Apparently healthy poultry Without history of vaccine against H5N1 Total number of poultry surveyed in the South and the North Species South North Duck 2,957 (95.4%) 2,233 (88.4%) Chicken 137 (4.4%) 290 (11.5%) Others 6 (0.2%) 2 (0.1%) Total 3,100 2,525 18
19 Prevalence of AI virus from 4 different angles I. Number of LPAI and HPAI virus isolate II. Number of AIV isolates in backyard and LBM III. Subtype of AIV isolates IV. AIV positive rate of backyard and LBM (at a premise level) Backyard poultry LBM poultry 19
20 (I) LPAI and HPAI virus isolate in the South 88% 12% LPAI Apr. 09 Mar. 10 Oct. 10 Feb. 11 Oct. 11 Feb. 12 Oct. 12 Total 39 (13.0%) 1 (0.3%) 25 (8.3%) HPAI No. of bird 12 ( 3.0%) 1 (0.3%) 53 ( 8.8%) 15 (2.5%) 22 ( 3.7%) 4 (0.7%) 12 (2.0%) 2 (0.3%) 164 ( 5.3%) 22 (0.7%) ,100 20
21 (I) LPAI and HPAI virus isolate in the North 67% 33% Mar. 09 Jan. 10 Sep. 11 Apr. 12 Aug. 12 Total LPAI 0 0 HPAI 0 0 No. of bird 5 (0.8%) 1 (0.2%) 35 (5.8%) 10 (1.7%) 13 (2.2%) 15 (2.5%) 53 ( 2.1%) 26 (1.0%) ,525 21
22 Summary-I (I) LPAI and HPAI virus isolate LPAI viruses were more frequently isolated from poultry in the South than in the North. However, the number of HPAI virus isolate in the North was slightly larger than that in the South. No of bird LPAI HPAI Total South 3, (5.3%) 22 (0.7%) 186 (6.0%) North 2, (2.1%) 26 (1.0%) 79 (3.1%) 22
23 (II) AI virus isolate in backyard and LBM in the South Backyard LBM No. of bird 1,700 1,400 No. of isolate LPAI 24 (1.4%) 140 (10.0%) HPAI 0 22 (1.6%) 23
24 No. isolate (II) AI virus isolate in backyard and LBM in the South 87% 13% Apr. 09 Mar. 10 Oct 11 Feb 11 Oct 11 Feb 12 Oct 12 Total Backyard LBM (1) 65 (15) 21 (4) 9 (2) 162 (22) 24
25 (II) AI virus isolate in backyard and LBM in the North Backyard LBM No. of bird 1,475 1,050 No. of isolate LPAI 13 (0.9%) 41 (3.9%) HPAI 0 26 (2.5%) 25
26 No. isolate (II) AI virus isolate in backyard and LBM in the North 84% 16% Mar. 09 Jan. 10 Sep 11 Apr. 12 Aug. 12 Total Backyard LBM (1) 32 (10) 29 (15) 67 (26) 26
27 Summary-II (II) AI virus isolate in backyard and LBM In both the South and the North: More than 80 % of AIV were isolated from LBM poultry. HPAI viruses were exclusively isolated from LBM poultry. 27
28 (III) Subtype of AIV isolates in the South No. of isolate 1st 2nd 3rd 4th 5th 6th 7 th HPAI H5N1 (1) H5N1 (15) H5N1 (4) H5N1 (2) LPAI 6 sub. 1 sub. 2 sub. 4 sub. 5 sub. 8 sub. 4 sub. H3N2 (1) H9N6 (1) H6N2 (24) H6N2 (7) H3N6 (1) H4N6 (1) H3N8 (4) H3N8 (1) H6N6 (1) H11N5 (3) H3N8 (7) H6N2 (1) H6N2 (4) H4N6 (7) H11N9 (2) H4N6 (4) H7N1 (2) H11N6 (1) H9N2 (26) H6N2 (39) H9N2 (12) H11N9 (3) H11N3 (3) H6N9 (2) H9N8 (2) H11N9 (1) H10N7 (1) H10N8 (1) H11N3 (2) Note: Figure in parenthesis shows the number of isolate. 28
29 Subtype of AIV isolates in Backyard and LBM in the South 1st 2nd 3rd 4th 5th 6th 7th Backyard 2 sub sub. 5 sub. 2 sub. H4N6 H9N H4N6 H7N1 H9N2 H9N8 H10N7 H10N8 H3N8 H11N9 LBM 5 sub. 1 sub. 2 sub. 4 sub. 6 sub. 9 sub. 4 sub. H3N2 H3N8 H9N2 H11N3 H11N9 H9N6 H6N2 H6N6 H5N1 H6N2 H11N5 H11N9 H3N6 H3N8 H4N6 H5N1 H6N2 H6N9 H4N6 H5N1 H6N2 H7N1 H9N2 H9N8 H10N7 H10N8 H11N3 H3N8 H5N1 H6N2 H11N6 29
30 No. of isolate 1st 2nd 3rd 4th 5th HPAI 0 0 LPAI (III) Subtype of AIV isolates in the North H5N1 (1) H5N1 (10) H5N1 (14) H5N2 (1) subtypes 6 subtypes 3 subtypes - - H3N8 (1) H4N2 (1) H6N6 (3) H3N2 (11) H3N6 (9) H4N6 (4) H6N6 (6) H9N2 (4) H11N9 (1) H3N8 (7) H9N2 (5) H9N8 (1) Note: Figure in parenthesis shows the number of isolate. 30
31 (III) Subtype of AIV isolates in Backyard and LBM in the North 1st 2nd 3rd 4th 5th Backyard subtypes 0 1 subtype - - H3N2 H3N6 H4N6 H6N6 H11N9 - H4N6 LBM subtypes 5 subtypes 5 subtypes - - H3N8 H4N2 H5N1 H6N6 H3N2 H3N6 H5N1 H6N6 H9N2 H5N1 H5N2 H9N2 H3N8 H9N8 31
32 Summary-III (III) Number of AI virus isolate in backyard and LBM Different subtypes of AIV were detected from LBM poultry. H9N2 and H6N2 viruses were more frequently isolated in the South. 32
33 (IV) AIV positive rate of backyard and LBM in the South % Real time RT-PCR in Vietnam 33
34 (IV) AIV positive rate of backyard and LBM in the South % LAMP in Japan 34
35 (IV) AIV positive rate of backyard and LBM in the South Virus isolation in Japan % 35
36 Summary-IV (IV) AIV positive rate of backyard and LBM AIV positive rate of LBM was higher than that of backyard farm in every round of the surveillance. 36
37 Overall summaries of the results Percentage of LBM infected with AIV was higher than that of backyard farm. Thus, LBM is more likely to be infected with AIVs than backyard farms. AIVs were more frequently isolated from LBM poultry than backyard poultry. Thus, LBM poultry is more likely to be infected with AIVs than backyard poultry. Different subtypes of AIV were isolated from LBMs than backyard farms. Thus, LBM poultry are more likely to be infected with different subtypes than backyard poultry. No H5N1 virus was isolated from backyard farms, while 48 HPAI viruses were isolated from LBMs in the past 2 years. Thus, LBM is more likely to be infected with HPAI virus than backyard farms. 37
38 Observations LBM can act as the key amplifier of AI virus including H5N1 and maintain the virus in the environment. LBM can promote, more than backyard farms, the amplification, circulation and dissemination of AI virus in the environment. If we reduce the level of amplification of H5N1 virus in LBM, we can decrease the amount of the virus in the environment. If we can decrease the virus load in the environment, the chance of virus transmission from LBMs to farms will also be reduced. 38
39 Conclusion LBMs should be the primarily target for the H5N1 control in endemically/sporadically infected countries through the combination of various measures including; (1) Regulating the introduction of poultry into LBMs, (2) Improving the hygiene practice (cleaning and disinfection), (3) Regulating the overnight poultry practice (4) Not allowing people to take poultry live, etc. Surveillance systems should be incorporated into these control measures to monitor and check the virus level in the environment, which enable us to confirm the progress of the H5N1 control. Involvement of local communities and people is of paramount importance to lead the efforts to be successful ones. 39
40 H5N1 HPAI situation in Asia Tip of the iceberg Outbreaks Passive surveillance Reported Unreported Surface of the water farms Subclinical Infection Active surveillance Virus circulation Markets Duck population IIlegally introduced animals, etc.
41 Acknowledgements Department of Animal Health of Vietnam (DAH) National Centre for Veterinary Diagnostics of Vietnam (NCVD) Regional Animal Health Office No. 7 of Vietnam (RAHO-7) Hokkaido University (OIE Reference Lab for HPAI in Japan) Yamashina Institute for Ornithology in Japan National Diagnostic Centre of Animal Quarantine Service of Ministry of Agriculture, Forestry and Fisheries of Japan (MAFF) MAFF-Japan (Donor of the Project)
42 Thank you for your attention.
in Vietnam Under the OIE/Japan Trust Fund Project (JTF) for Strengthening HPAI Control Hanoi, 2-3 October 2012
Influenza A virus Prevalence Studies in Poultry in Vietnam Under the OIE/Japan Trust Fund Project (JTF) for Strengthening HPAI Control in Asia, 2008-2012 Kenji Sakurai OIE Asia Pacific Kenji Sakurai, OIE
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