1
|
Phomsisavath V, Roberts T, Seupsanith A, Robinson MT, Nammanininh P, Chanthavong S, Chansamouth V, Vongsouvath M, Theppangna W, Christensen P, Blacksell SD, Mayxay M, Ashley EA. Investigation of Escherichia coli isolates from pigs and humans for colistin resistance in Lao PDR- a cross-sectional study. One Health 2024; 18:100745. [PMID: 38725959 PMCID: PMC11079391 DOI: 10.1016/j.onehlt.2024.100745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 03/26/2024] [Accepted: 04/29/2024] [Indexed: 05/12/2024] Open
Abstract
Background In Laos, colistin is not currently registered for use in humans. This One Health study aimed to estimate the prevalence of meat-producing pigs carrying colistin-resistant Escherichia coli, and investigate if E. coli causing invasive human infections were colistin-resistant. Methods Between September 2022 and March 2023, rectal swabs were collected from 895 pigs from abattoirs in 9/17 Lao provinces. Pig rectal swabs and stored E. coli isolates from human blood cultures, submitted to Mahosot Hospital Microbiology laboratory between 2005 and 2022, were screened for colistin resistance on selective chromogenic agar with organism identification confirmed using MALDI-TOF MS. Suspected colistin-resistant isolates underwent colistin susceptibility testing by broth microdilution following European Committee on Antimicrobial Susceptibility Testing (EUCAST) guidelines. Isolates with MIC values of ≥2 μg/ml were tested for plasmid-mediated colistin resistance genes (mcr-1, mcr-2, and mcr-3) by multiplex SYBR Green PCR. Results A total of 15/620 (2.41%) invasive human E. coli isolates were phenotypically colistin-resistant by broth microdilution (MIC values 4 to 8 μg/ml). The earliest isolate was from 2015 in a patient from Phongsaly province in Northern Laos. A total of 582/895 (65.02%) pig rectal swab samples contained colistin-resistant E. coli. The detected colistin resistance genes were predominantly mcr-1 (57.8%, 346/598), followed by mcr-3 (20.23%,121/598), and 22.24% (133/598) were found to co-harbour mcr-1 and mcr-3. Among the 15 human isolates with colistin MIC values of ≥4 μg/ml, 12/15 were mcr-1. Conclusions We found that colistin resistant E. coli is causing invasive infection in humans in Laos despite the fact it is not available for human use. Use in animals seems to be widespread, confirmed by high carriage rates of colistin-resistant E. coli in pigs. It is probable that food-producing animals are the source of colistin-resistant E. coli bloodstream infection in Laos, although these have been infrequent to date. This is a serious public health concern in the region that needs to be addressed by appropriate enforceable legislation.
Collapse
Affiliation(s)
- Vilaiphone Phomsisavath
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
| | - Tamalee Roberts
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Centre for Tropical Medicine and Global Health, University of Oxford, United Kingdom
| | - Amphayvanh Seupsanith
- Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
| | - Matthew T. Robinson
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Centre for Tropical Medicine and Global Health, University of Oxford, United Kingdom
| | | | | | - Vilada Chansamouth
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
| | - Manivanh Vongsouvath
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Vientiane, Lao People’s Democratic Republic
| | - Peter Christensen
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Stuart D. Blacksell
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Centre for Tropical Medicine and Global Health, University of Oxford, United Kingdom
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Mayfong Mayxay
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Centre for Tropical Medicine and Global Health, University of Oxford, United Kingdom
- Institute of Research and Education Development (IRED), University of Health Sciences, Vientiane, Lao People’s Democratic Republic
- Lao One Health University Network (LAOHUN), Vientiane, Lao People’s Democratic Republic
| | - Elizabeth A. Ashley
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Centre for Tropical Medicine and Global Health, University of Oxford, United Kingdom
| |
Collapse
|
2
|
Oyuchua M, Siengsanan-Lamont J, Le KK, Kamolsiripichaiporn S, Areerob J, Thongkamkoon P, Theppangna W, Phommachanh P, Tum S, Johnson B, Blacksell SD. The Importance and Challenges of Implementing and Maintaining Biorepositories for High-Consequence Veterinary and One Health Pathogens in South-East Asia. Appl Biosaf 2024; 29:35-44. [PMID: 38434101 PMCID: PMC10902268 DOI: 10.1089/apb.2023.0006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2024]
Abstract
Introduction Emerging infectious diseases pose a threat to public health and the economy, especially in developing countries. Southeast Asian veterinary laboratories handle numerous high-risk pathogens, making pathogen accountability crucial for safe handling and storage. Methods Thirteen veterinary laboratories in Cambodia (n = 1), Lao People's Democratic Republic (n = 1), and Thailand (n = 11) participated in a study conducted between 2019 and 2020. Data were collected using a questionnaire, group discussions, and interviews. Conclusion Significant gaps in biosecurity and biorepository management were recognized and discussed in the context of regional biosafety and biosecurity. Laboratories could use the findings and recommendations of the study to develop or improve their pathogen inventory and biosecurity systems. Governments play a significant role in setting standards and regulations and providing necessary support for laboratories to maintain inventory controls sustainably and have a very important role to play in ensuring biosafety and biosecurity compliance.
Collapse
Affiliation(s)
- Malinee Oyuchua
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Jarunee Siengsanan-Lamont
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Kim Khanh Le
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Somjai Kamolsiripichaiporn
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Jeeranan Areerob
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Pacharee Thongkamkoon
- National Institute of Animal Health, Department of Livestock Development, Bangkok, Thailand
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao PDR
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao PDR
| | - Sothyra Tum
- National Animal Health and Production Research Institute, General Directorate for Animal, Health and Production, Phnom Penh, Cambodia
| | - Barbara Johnson
- Biosafety and Biosecurity International, Merritt Island, Florida, USA
| | - Stuart D. Blacksell
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, Nuffield Department of Medicine Research Building, University of Oxford, Oxford, United Kingdom
| |
Collapse
|
3
|
Matsumoto N, Siengsanan-Lamont J, Halasa T, Young JR, Ward MP, Douangngeun B, Theppangna W, Khounsy S, Toribio JALML, Bush RD, Blacksell SD. Retrospective investigation of the 2019 African swine fever epidemic within smallholder pig farms in Oudomxay province, Lao PDR. Front Vet Sci 2023; 10:1277660. [PMID: 37841473 PMCID: PMC10576527 DOI: 10.3389/fvets.2023.1277660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 09/12/2023] [Indexed: 10/17/2023] Open
Abstract
The 2019 African swine fever (ASF) outbreak in the Lao People's Democratic Republic (Lao PDR or Laos) represented a major epidemiologic event where a transitioning lower-middle income nation (LMIC) experienced a viral epidemic in a naïve pig population. The diversity of pig management styles creates challenges for local and regional policymakers when formulating recommendations to control an ASF outbreak. The aim of this study were to investigate the management of pigs in villages of Oudomxay province that were affected by ASF in 2019, as a case study in a smallholder pig-rasing system in northern Laos. The frequencies of well known risk factors were measured in the affected villages and the timelines and household level stock losses due to the outbreak were investigated. These findings were compared to data available from a similar outbreak in the southern province of Savannakhet. Disease control implications of these findings are discussed. Mean losses were 3.0-23.3 pigs per household, with a mean lost herd value of USD 349, 95% CI (294-415). These pig losses reflect those estimated in Savannakhet (6.7 pigs per household). However, the financial loss estimated per household was higher, USD 349 versus USD 215, possibly due to higher pig values and a higher input/output management approach in Oudomxay. The investigation revealed the presence of numerous ASF risk factors, such as swill-feeding and free-ranging. In addition, poor biosecurity practices - such as inappropriate garbage disposal and slaughtering - that could contaminate the environment were present. ASF cases occurred across all villages between June and December 2019, with outbreak periods ranging from 22-103 days. These values are consistent with the outbreak in Savannakhet; however, notable differences in management styles were observed. These findings demonstrate the need for more disease control resources from the village to the Governmental level. Villages need support in enacting context appropriate biosecurity measures, whilst the ongoing surveillance and investigation of ASF require investment in logistical and veterinary resources at the Governmental level.
Collapse
Affiliation(s)
- Nina Matsumoto
- Sydney School of Veterinary Science, The University of Sydney, Camden, NSW, Australia
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Jarunee Siengsanan-Lamont
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Tariq Halasa
- Section of Animal Welfare and Disease Control, Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - James R. Young
- Sydney School of Veterinary Science, The University of Sydney, Camden, NSW, Australia
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Michael P. Ward
- Sydney School of Veterinary Science, The University of Sydney, Camden, NSW, Australia
| | - Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Laos
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Laos
| | - Syseng Khounsy
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Laos
| | | | - Russell D. Bush
- Sydney School of Veterinary Science, The University of Sydney, Camden, NSW, Australia
| | - Stuart D. Blacksell
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Nuffield Department of Medicine, Centre for Tropical Medicine & Global Health, University of Oxford, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Laos
| |
Collapse
|
4
|
Pruvot M, Denstedt E, Latinne A, Porco A, Montecino-Latorre D, Khammavong K, Milavong P, Phouangsouvanh S, Sisavanh M, Nga NTT, Ngoc PTB, Thanh VD, Chea S, Sours S, Phommachanh P, Theppangna W, Phiphakhavong S, Vanna C, Masphal K, Sothyra T, San S, Chamnan H, Long PT, Diep NT, Duoc VT, Zimmer P, Brown K, Olson SH, Fine AE. WildHealthNet: Supporting the development of sustainable wildlife health surveillance networks in Southeast Asia. Sci Total Environ 2023; 863:160748. [PMID: 36513230 DOI: 10.1016/j.scitotenv.2022.160748] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 11/29/2022] [Accepted: 12/03/2022] [Indexed: 06/17/2023]
Abstract
Wildlife and wildlife interfaces with people and livestock are essential surveillance targets to monitor emergent or endemic pathogens or new threats affecting wildlife, livestock, and human health. However, limitations of previous investments in scope and duration have resulted in a neglect of wildlife health surveillance (WHS) systems at national and global scales, particularly in lower and middle income countries (LMICs). Building on decades of wildlife health activities in LMICs, we demonstrate the implementation of a locally-driven multi-pronged One Health approach to establishing WHS in Cambodia, Lao PDR and Viet Nam under the WildHealthNet initiative. WildHealthNet utilizes existing local capacity in the animal, public health, and environmental sectors for event based or targeted surveillance and disease detection. To scale up surveillance systems to the national level, WildHealthNet relies on iterative field implementation and policy development, capacity bridging, improving data collection and management systems, and implementing context specific responses to wildlife health intelligence. National WHS systems piloted in Cambodia, Lao PDR, and Viet Nam engaged protected area rangers, wildlife rescue centers, community members, and livestock and human health sector staff and laboratories. Surveillance activities detected outbreaks of H5N1 highly pathogenic avian influenza in wild birds, African swine fever in wild boar (Sus scrofa), Lumpy skin disease in banteng (Bos javanicus), and other endemic zoonotic pathogens identified as surveillance priorities by local stakeholders. In Cambodia and Lao PDR, national plans for wildlife disease surveillance are being signed into legislation. Cross-sectoral and trans-disciplinary approaches are needed to implement effective WHS systems. Long-term commitment, and paralleled implementation and policy development are key to sustainable WHS networks. WildHealthNet offers a roadmap to aid in the development of locally-relevant and locally-led WHS systems that support the global objectives of the World Organization for Animal Health's Wildlife Health Framework and other international agendas.
Collapse
Affiliation(s)
- Mathieu Pruvot
- Wildlife Conservation Society, Health Program, Bronx, NY, USA; University of Calgary, Faculty of Veterinary Medicine, Calgary, AB, Canada.
| | - Emily Denstedt
- Wildlife Conservation Society, Lao PDR Country Program, Vientiane, Laos
| | - Alice Latinne
- Wildlife Conservation Society, Viet Nam Country Program, Hanoi, Viet Nam
| | - Alice Porco
- Wildlife Conservation Society, Cambodia Country Program, Phnom Penh, Cambodia
| | | | - Kongsy Khammavong
- Wildlife Conservation Society, Lao PDR Country Program, Vientiane, Laos
| | | | | | - Manoly Sisavanh
- Wildlife Conservation Society, Lao PDR Country Program, Vientiane, Laos
| | | | - Pham Thi Bich Ngoc
- Wildlife Conservation Society, Viet Nam Country Program, Hanoi, Viet Nam
| | - Vo Duy Thanh
- Wildlife Conservation Society, Viet Nam Country Program, Hanoi, Viet Nam
| | - Sokha Chea
- Wildlife Conservation Society, Cambodia Country Program, Phnom Penh, Cambodia
| | - Sreyem Sours
- Wildlife Conservation Society, Cambodia Country Program, Phnom Penh, Cambodia
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Vientiane, Laos
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Vientiane, Laos
| | - Sithong Phiphakhavong
- National Animal Health Laboratory, Department of Livestock and Fisheries, Vientiane, Laos
| | - Chhuon Vanna
- Department of Wildlife and Biodiversity, Forestry Administration, Phnom Penh, Cambodia
| | - Kry Masphal
- Department of Wildlife and Biodiversity, Forestry Administration, Phnom Penh, Cambodia
| | - Tum Sothyra
- National Animal Health and Production Research Institute, Phnom Penh, Cambodia
| | - Sorn San
- General Directorate of Animal Health and Production, Phnom Penh, Cambodia
| | - Hong Chamnan
- General Directorate of Natural Protected Areas, Phnom Penh, Cambodia
| | - Pham Thanh Long
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Viet Nam
| | - Nguyen Thi Diep
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Viet Nam
| | - Vu Trong Duoc
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
| | - Patrick Zimmer
- Canadian Wildlife Health Cooperative, Saskatoon, SK, Canada
| | - Kevin Brown
- Canadian Wildlife Health Cooperative, Saskatoon, SK, Canada
| | - Sarah H Olson
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Amanda E Fine
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| |
Collapse
|
5
|
Matsumoto N, Douangngeun B, Theppangna W, Khounsy S, Phommachanh P, Toribio JA, Bush RD, Selleck PW, Gleeson LJ, Siengsanan-Lamont J, Blacksell SD. Utilising abattoir sero-surveillance for high-impact and zoonotic pig diseases in Lao PDR. Epidemiol Infect 2023; 151:e40. [PMID: 36750223 PMCID: PMC10028928 DOI: 10.1017/s095026882300016x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 01/17/2023] [Accepted: 01/29/2023] [Indexed: 02/09/2023] Open
Abstract
National disease surveillance systems are essential to a healthy pig industry but can be costly and logistically complex. In 2019, Lao People's Democratic Republic (Lao PDR) piloted an abattoir disease surveillance system to assess for the presence of high impact pig diseases (HIPDs) using serological methods. The Lao Department of Livestock and Fisheries (DLF) identified Classical Swine Fever (CSF), Porcine Respiratory and Reproductive Syndrome (PRRS) and Brucella suis as HIPDs of interest for sero-surveillance purposes. Porcine serum samples (n = 597) were collected from six Lao abattoirs in March to December of 2019. Serological enzyme-linked immunosorbent assay (ELISA) methods were chosen for their high-throughput and relatively low-costs. The true seroprevalence for CSF and PRRS seropositivity were 68.7%, 95% CI (64.8-72.3) and 39.5%, 95% CI (35.7-43.5), respectively. The results demonstrated no evidence of Brucella spp. seroconversion. Lao breed pigs were less likely to be CSF seropositive (P < 0.05), whilst pigs slaughtered at <1 year of age were less likely to be PRRS seropositive (P < 0.01). The testing methods could not differentiate between seropositivity gained from vaccine or natural infection, and investigators were unable to obtain the vaccine status of the slaughtered pigs from the abattoirs. These results demonstrate that adequate sample sizes are possible from abattoir sero-surveillance and lifetime health traceability is necessary to understand HIPDs in Lao PDR.
Collapse
Affiliation(s)
- Nina Matsumoto
- Sydney School of Veterinary Science, The University of Sydney, 425 Werombi Road, Camden, NSW, Australia
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd, Bangkok 10400, Thailand
| | - Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao People's Democratic Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao People's Democratic Republic
| | - Syseng Khounsy
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao People's Democratic Republic
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao People's Democratic Republic
| | - Jenny-Ann Toribio
- Sydney School of Veterinary Science, The University of Sydney, 425 Werombi Road, Camden, NSW, Australia
| | - Russell D. Bush
- Sydney School of Veterinary Science, The University of Sydney, 425 Werombi Road, Camden, NSW, Australia
| | - Paul W. Selleck
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd, Bangkok 10400, Thailand
| | - Laurence J. Gleeson
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd, Bangkok 10400, Thailand
| | - Jarunee Siengsanan-Lamont
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd, Bangkok 10400, Thailand
| | - Stuart D. Blacksell
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd, Bangkok 10400, Thailand
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People's Democratic Republic
| |
Collapse
|
6
|
Siengsanan-Lamont J, Theppangna W, Phommachanh P, Khounsy S, Selleck PW, Matsumoto N, Gleeson LJ, Blacksell SD. Abattoir-Based Serological Surveillance and Spatial Risk Analysis of Foot-and-Mouth Disease, Brucellosis, and Q Fever in Lao PDR Large Ruminants. Trop Med Infect Dis 2022; 7:78. [PMID: 35622705 PMCID: PMC9145528 DOI: 10.3390/tropicalmed7050078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 04/15/2022] [Accepted: 04/22/2022] [Indexed: 11/16/2022] Open
Abstract
A national animal disease surveillance network initiated by the Lao PDR government is adopted and reinforced by a joint research project between the National Animal Health Laboratory (NAHL), the Department of Livestock and Fisheries (DLF), and the Mahidol Oxford Tropical Medicine Research Unit (MORU). The network is strengthened by staff training and practical exercises and is utilised to provide zoonotic or high-impact disease information on a national scale. Between January and December 2020, large ruminant samples are collected monthly from 18 abattoirs, one in each province, by provincial and district agriculture and forestry officers. The surveillance network collected a total of 4247 serum samples (1316 buffaloes and 2931 cattle) over this period. Samples are tested for antibodies against Brucella spp., Coxiella burnetii (Q fever) and Foot-and-Mouth Disease Non-Structural Protein (FMD NSP) using commercial ELISA kits and the Rose Bengal test. Seroprevalences of Q fever and brucellosis in large ruminants are low at 1.7% (95% CI: 1.3, 2.1) and 0.7% (95% CI: 0.5, 1.0) respectively, while for FMD NSP it is 50.5% (95% CI: 49.0, 52.0). Univariate analyses show differences in seroprevalences of Q fever between destination (abattoir) province (p-value = 0.005), province of origin (p-value = 0.005), animal type (buffalo or cattle) (p-value = 0.0008), and collection month (p-value = 3.4 × 10−6). Similar to Q fever, seroprevalences of brucellosis were significantly different for destination province (p-value < 0.00001), province of origin (p-value < 0.00001), animal type (p-value = 9.9 × 10−5) and collection month (p-value < 0.00001), plus body condition score (p-value = 0.003), and age (p-value = 0.007). Additionally, risk factors of the FMD NSP dataset include the destination province (p-value < 0.00001), province of origin (p-value < 0.00001), sex (p-value = 7.97 × 10−8), age (p-value = 0.009), collection date (p-value < 0.00001), and collection month (p-value < 0.00001). Spatial analyses revealed that there is no spatial correlation of FMD NSP seropositive animals. High-risk areas for Q fever and brucellosis are identified by spatial analyses. Further investigation of the higher risk areas would provide a better epidemiological understanding of both diseases in Lao PDR. In conclusion, the abattoir serological survey provides useful information about disease exposure and potential risk factors. The network is a good base for field and laboratory staff training in practical technical skills. However, the sustainability of such a surveillance activity is relatively low without an external source of funding, given the operational costs and insufficient government budget. The cost-effectiveness of the abattoir survey could be increased by targeting hotspot areas, reducing fixed costs, and extending the focus to cover more diseases.
Collapse
Affiliation(s)
- Jarunee Siengsanan-Lamont
- Maihdol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.S.-L.); (P.W.S.); (L.J.G.)
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane 01001, Laos; (W.T.); (P.P.)
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane 01001, Laos; (W.T.); (P.P.)
| | - Syseng Khounsy
- Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane 01001, Laos;
| | - Paul W. Selleck
- Maihdol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.S.-L.); (P.W.S.); (L.J.G.)
| | - Nina Matsumoto
- Sydney School of Veterinary Science, University of Sydney, Camden, NSW 2570, Australia;
| | - Laurence J. Gleeson
- Maihdol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.S.-L.); (P.W.S.); (L.J.G.)
| | - Stuart D. Blacksell
- Maihdol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand; (J.S.-L.); (P.W.S.); (L.J.G.)
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7LG, UK
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Mahosot Hospital, Vientiane 01000, Laos
| |
Collapse
|
7
|
Nawtaisong P, Robinson MT, Khammavong K, Milavong P, Rachlin A, Dittrich S, Dubot-Pérès A, Vongsouvath M, Horwood PF, Dussart P, Theppangna W, Douangngeum B, Fine AE, Pruvot M, Newton PN. Zoonotic Pathogens in Wildlife Traded in Markets for Human Consumption, Laos. Emerg Infect Dis 2022; 28:860-864. [PMID: 35318932 PMCID: PMC8962878 DOI: 10.3201/eid2804.210249] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We tested animals from wildlife trade sites in Laos for the presence of zoonotic pathogens. Leptospira spp. were the most frequently detected infectious agents, found in 20.1% of animals. Rickettsia typhi and R. felis were also detected. These findings suggest a substantial risk for exposure through handling and consumption of wild animal meat.
Collapse
|
8
|
Matsumoto N, Siengsanan-Lamont J, Halasa T, Young JR, Ward MP, Douangngeun B, Theppangna W, Khounsy S, Toribio JALML, Bush RD, Blacksell SD. The impact of African swine fever virus on smallholder village pig production: An outbreak investigation in Lao PDR. Transbound Emerg Dis 2021; 68:2897-2908. [PMID: 34146447 PMCID: PMC9292446 DOI: 10.1111/tbed.14193] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 11/30/2022]
Abstract
African swine fever virus (ASFV) causes a deadly disease of pigs which spread through southeast Asia in 2019. We investigated one of the first outbreaks of ASFV in Lao People's Democratic Republic amongst smallholder villages of Thapangtong District, Savannakhet Province. In this study, two ASFV affected villages were compared to two unaffected villages. Evidence of ASFV‐like clinical signs appeared in pig herds as early as May 2019, with median epidemic days on 1 and 18 June in the two villages, respectively. Using participatory epidemiology mapping techniques, we found statistically significant spatial clustering in both outbreaks (p < 0.001). Villagers reported known risk factors for ASFV transmission – such as free‐ranging management systems and wild boar access – in all four villages. The villagers reported increased pig trader activity from Vietnam before the outbreaks; however, the survey did not determine a single outbreak source. The outbreak caused substantial household financial losses with an average of nine pigs lost to the disease, and Monte Carlo analysis estimated this to be USD 215 per household. ASFV poses a significant threat to food and financial security in smallholder communities such as Thapangtong, where 40.6% of the district's population are affected by poverty. This study shows ASFV management in the region will require increased local government resources, knowledge of informal trader activity and wild boar monitoring alongside education and support to address intra‐village risk factors such as free‐ranging, incorrect waste disposal and swill feeding.
Collapse
Affiliation(s)
- Nina Matsumoto
- Sydney School of Veterinary Science, The University of Sydney, Camden, New South Wales, Australia.,Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Jarunee Siengsanan-Lamont
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Tariq Halasa
- Section of Animal welfare and Disease Control, Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - James R Young
- Sydney School of Veterinary Science, The University of Sydney, Camden, New South Wales, Australia
| | - Michael P Ward
- Sydney School of Veterinary Science, The University of Sydney, Camden, New South Wales, Australia
| | - Bounlom Douangngeun
- Sydney School of Veterinary Science, The University of Sydney, Camden, New South Wales, Australia
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Syseng Khounsy
- Section of Animal welfare and Disease Control, Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - Jenny-Ann L M L Toribio
- Sydney School of Veterinary Science, The University of Sydney, Camden, New South Wales, Australia
| | - Russell D Bush
- Sydney School of Veterinary Science, The University of Sydney, Camden, New South Wales, Australia
| | - Stuart D Blacksell
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.,Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People's Democratic Republic
| |
Collapse
|
9
|
Siengsanan-Lamont J, Douangngeun B, Theppangna W, Khounsy S, Phommachanh P, Kamolsiripichaiporn S, Udon R, Seeyo KB, Selleck PW, Matsumoto N, Gleeson LJ, Blacksell SD. Seroepidemiology of Foot and Mouth Disease using passive surveillance techniques in selected provinces of Lao PDR. Trop Anim Health Prod 2021; 53:303. [PMID: 33934210 PMCID: PMC8088427 DOI: 10.1007/s11250-021-02734-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 04/18/2021] [Indexed: 11/25/2022]
Abstract
Foot and Mouth Disease (FMD) is a high-impact, contagious transboundary animal disease that is endemic in Southeast Asia. Abattoir samples were routinely collected in six selected provinces between March and December 2019. A total of 1280 samples of abattoir animals were tested for FMD Non-Structural Protein (NSP) antibodies to indicate natural infections. Overall, 22.8% were seropositive for FMD NSP antibodies while seroprevalence of cattle (n = 469), buffalo (n = 214), and pigs (n = 597) were 44.6%, 35.0%, and 1.3%, respectively. The highest seroprevalence destination province was Xiengkhouang (35.3% of 272 samples), followed by Savannakhet (27.0% of 244 samples). Risk factors for evidence of natural infection identified by a multivariate logistic regression model included age groups (p-value = 0.02) and origin provinces (p-value = 2.8 × 10−5) of the animals. There were significant differences of FMD NSP seroprevalence between age groups and origin provinces of the animals. The odds ratio of a seropositive result in the less than 1 year old group was 2.5 (95% CI; 1.4, 4.4) when compared to the 3–4 years old group, while the odds ratios for animals that originated from Khammouane and Xiengkhouang provinces were 4.5 (95% CI; 1.1, 18.7) and 2.4 (95% CI; 1.4, 4.1), respectively, when compared to Champasak province. Serotype-specific antibody ELISA for 44 NSP antibody–positive samples revealed evidence of FMD serotypes O and A virus circulation in some provinces. Despite the passive abattoir survey providing useful information on FMD virus previous exposure and geographic locations of the animals, timely information on FMD virus circulation and distribution is also crucial to an effective control program. Alternative approaches to increase the cost-effectiveness of the surveillance network are also discussed.
Collapse
Affiliation(s)
- Jarunee Siengsanan-Lamont
- Maidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Syseng Khounsy
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Somjai Kamolsiripichaiporn
- Maidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Romphruke Udon
- Regional Reference Laboratory for Foot and Mouth Disease in South East Asia, Department of Livestock Development, Nakhon Ratchasima, Thailand
| | - Kingkarn Boonsuya Seeyo
- Regional Reference Laboratory for Foot and Mouth Disease in South East Asia, Department of Livestock Development, Nakhon Ratchasima, Thailand
| | - Paul W Selleck
- Maidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Nina Matsumoto
- Sydney School of Veterinary Science, University of Sydney, Camden, Australia
| | - Laurence J Gleeson
- Maidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Stuart D Blacksell
- Maidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Mahosot Hospital, Vientiane, Lao People's Democratic Republic.
| |
Collapse
|
10
|
Matsumoto N, Siengsanan-Lamont J, Gleeson LJ, Douangngeun B, Theppangna W, Khounsy S, Phommachanh P, Halasa T, Bush RD, Blacksell SD. Evaluation of the diagnostic accuracy of an affordable rapid diagnostic test for African Swine Fever antigen detection in Lao People's Democratic Republic. J Virol Methods 2020; 286:113975. [PMID: 32956709 PMCID: PMC7646196 DOI: 10.1016/j.jviromet.2020.113975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 09/14/2020] [Accepted: 09/15/2020] [Indexed: 12/05/2022]
Abstract
African Swine Fever (ASF) is a transboundary animal disease of pigs and wild suids that appeared in Lao People's Democratic Republic (Lao PDR) in mid-2019, having spread across China and Vietnam in the months prior. Despite the scale of the Asian ASF pandemic and the availability of pen-side rapid diagnostic tests (RDT) on the market, few locally produced and easily available ASF RDTs have been evaluated for diagnostic accuracy. In this study, an ASF antigen detection RDT from Shenzhen Lvshiyuan Biotechnology Co. Ltd was evaluated using clinical field samples submitted to the National Animal Health Laboratory (NAHL) from ASF suspect cases between June and December 2019 in Lao PDR. Positive (n = 57) and negative (n = 50) samples of whole blood, serum and haemolysed serum were assessed by RDT and PCR, with the latter used as the gold standard reference comparator. Overall the RDT had a diagnostic sensitivity (DSe) of 65 %, 95 % CI [51–77] and diagnostic specificity (DSp) of 76 %, 95 % CI [62–87]. The RDT demonstrated improved performance on samples with lower PCR cycle threshold (ct) values with each additional cycle reducing the odds of the RDT returning a positive by 17 % relative to the previous cycle, 95 % CI [8 %–28 %] (P < 0.01). While this test shows promise for field application, complete validation of diagnostic accuracy requires a larger sample size.
Collapse
Affiliation(s)
- Nina Matsumoto
- Sydney School of Veterinary Science, University of Sydney, Private Bag 4003, Narellan, NSW, 2567, Australia; Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd., Bangkok, 10400, Thailand
| | - Jarunee Siengsanan-Lamont
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd., Bangkok, 10400, Thailand
| | - Laurence J Gleeson
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd., Bangkok, 10400, Thailand
| | - Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao Democratic People's Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao Democratic People's Republic
| | - Syseng Khounsy
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao Democratic People's Republic
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Souphanouvong Avenue, Sikhottabong District, PO. Box 6644, Vientiane, Lao Democratic People's Republic
| | - Tariq Halasa
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, 1870, Frederiksberg C, Denmark
| | - Russell D Bush
- Sydney School of Veterinary Science, University of Sydney, Private Bag 4003, Narellan, NSW, 2567, Australia
| | - Stuart D Blacksell
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, 420/6 Rajvithi Rd., Bangkok, 10400, Thailand; Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom; Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao Democratic People's Republic.
| |
Collapse
|
11
|
Philavong C, Pruvot M, Reinharz D, Mayxay M, Khammavong K, Milavong P, Rattanavong S, Horwood PF, Dussart P, Douangngeun B, Theppangna W, Fine AE, Robinson MT, Newton PN. Perception of health risks in Lao market vendors. Zoonoses Public Health 2020; 67:796-804. [PMID: 32812389 PMCID: PMC7461205 DOI: 10.1111/zph.12759] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 05/21/2020] [Accepted: 07/15/2020] [Indexed: 01/20/2023]
Abstract
Wet markets are a critical part of South‐East Asian culture and economy. However, their role in circulation and transmission of both endemic and emerging disease is a source of concern in a region considered a hotspot of disease emergence. In the Lao People's Democratic Republic (Lao PDR, Laos), live and dead wild animals are frequently found in wet markets, despite legislation against the bushmeat trade. This is generally considered to increase the risk of disease transmission and emergence, although whether or not wildlife vendors themselves have indeed increased incidence of zoonotic disease has rarely been assessed. In preparation for a future longitudinal study of market vendors investigating vendors’ exposure to zoonotic pathogens, we conducted a pilot survey of Lao market vendors of wildlife meat, livestock meat and vegetables, to identify demographic characteristics and potential control groups within markets. We also investigated baseline risk perception for infectious diseases among market vendors and assessed the association between risk perception and risk mitigation behaviours. The surveys conducted with 177 vendors revealed similar age, sex, ethnic background and geographical origin between vendor types, but differences in professional background and work history for livestock meat vendors. The perception of disease risk was very low across all vendors, as was the reported use of personal protective equipment, and the two appeared unrelated. Personal risk discounting and assumptions about transmission routes may explain this lack of association. This information will help inform the development of future research, risk communication and risk mitigation policy, especially in the light of the COVID‐19 pandemic.
Collapse
Affiliation(s)
- Chanfong Philavong
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Ministry of Health, Vientiane, Lao PDR.,Institut de la Francophonie pour la Médecine Tropicale, Vientiane, Lao PDR
| | - Mathieu Pruvot
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Daniel Reinharz
- Institut de la Francophonie pour la Médecine Tropicale, Vientiane, Lao PDR.,Département de Médecine Sociale et Préventive, Université Laval, Québec City, QC, Canada
| | - Mayfong Mayxay
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK.,Institute of Research and Education Development, University of Health Sciences, Vientiane, Lao PDR
| | | | | | - Sayapeth Rattanavong
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR
| | - Paul F Horwood
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Australia.,Virology Unit, Institut Pasteur du Cambodge, Institut Pasteur International Network, Phnom Penh, Cambodia
| | - Philippe Dussart
- Virology Unit, Institut Pasteur du Cambodge, Institut Pasteur International Network, Phnom Penh, Cambodia
| | - Bounlom Douangngeun
- Department of Livestock and Fisheries, National Animal Health Laboratory, Ministry of Agriculture, Vientiane, Lao PDR
| | - Watthana Theppangna
- Department of Livestock and Fisheries, National Animal Health Laboratory, Ministry of Agriculture, Vientiane, Lao PDR
| | - Amanda E Fine
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Matthew T Robinson
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Paul N Newton
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Lao PDR.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| |
Collapse
|
12
|
McIver DJ, Silithammavong S, Theppangna W, Gillis A, Douangngeun B, Khammavong K, Singhalath S, Duong V, Buchy P, Olson SH, Keatts L, Fine AE, Greatorex Z, Gilbert M, LeBreton M, Saylors K, Joly DO, Rubin EM, Lange CE. Coronavirus surveillance of wildlife in the Lao People's Democratic Republic detects viral RNA in rodents. Arch Virol 2020; 165:1869-1875. [PMID: 32488616 PMCID: PMC7265875 DOI: 10.1007/s00705-020-04683-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/27/2020] [Indexed: 12/16/2022]
Abstract
Coronaviruses can become zoonotic, as in the case of COVID-19, and hunting, sale, and consumption of wild animals in Southeast Asia increases the risk for such incidents. We sampled and tested rodents (851) and other mammals and found betacoronavirus RNA in 12 rodents. The sequences belong to two separate genetic clusters and are closely related to those of known rodent coronaviruses detected in the region and distantly related to those of human coronaviruses OC43 and HKU1. Considering the close human-wildlife contact with many species in and beyond the region, a better understanding of virus diversity is urgently needed for the mitigation of future risks.
Collapse
Affiliation(s)
| | - Soubanh Silithammavong
- Wildlife Conservation Society, Laos Program, Vientiane, Lao PDR.,Metabiota Inc., San Francisco, CA, USA
| | - Watthana Theppangna
- Department of Livestock and Fisheries, National Animal Health Laboratory, Vientiane, Lao PDR
| | - Amethyst Gillis
- Metabiota Inc., San Francisco, CA, USA.,Development Alternatives, Inc., Washington, DC, USA
| | - Bounlom Douangngeun
- Department of Livestock and Fisheries, National Animal Health Laboratory, Vientiane, Lao PDR
| | | | | | - Veasna Duong
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia
| | - Philippe Buchy
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia.,GlaxoSmithKline Vaccines R&D, Greater China and Intercontinental, Shanghai, China
| | - Sarah H Olson
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Lucy Keatts
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Amanda E Fine
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Zoe Greatorex
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | - Martin Gilbert
- Wildlife Conservation Society, Health Program, Bronx, NY, USA
| | | | - Karen Saylors
- Metabiota Inc., San Francisco, CA, USA.,Labyrinth Global Health, Inc., St. Petersburg, FL, USA
| | - Damien O Joly
- Metabiota Inc., Nanaimo, BC, Canada.,Wildlife Conservation Society, Laos Program, Vientiane, Lao PDR.,British Columbia Ministry of Environment and Climate Change Strategy, Victoria, BC, Canada
| | | | | |
Collapse
|
13
|
Park YR, Lee YN, Lee DH, Baek YG, Si YJ, Meeduangchanh P, Theppangna W, Douangngeun B, Kye SJ, Lee MH, Park CK, Lee YJ. Genetic and pathogenic characteristics of clade 2.3.2.1c H5N1 highly pathogenic avian influenza viruses isolated from poultry outbreaks in Laos during 2015-2018. Transbound Emerg Dis 2019; 67:947-955. [PMID: 31769586 DOI: 10.1111/tbed.13430] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 10/25/2019] [Accepted: 11/18/2019] [Indexed: 12/17/2022]
Abstract
Since 2004, there have been multiple outbreaks of H5 highly pathogenic avian influenza (HPAI) viruses in Laos. Here, we isolated H5N1 HPAI viruses from poultry outbreaks in Laos during 2015-2018 and investigated their genetic characteristics and pathogenicity in chickens. Phylogenetic analysis revealed that the isolates belonged to clade 2.3.2.1c and that they differed from previous Laos viruses with respect to genetic composition. In particular, the isolates were divided into two genotypes, each of which had a different NS segments. The results of possible migration analysis suggested a high likelihood that the Laos isolates were introduced from neighbouring countries, particularly Vietnam. The recent Laos isolate, A/Duck/Laos/NL-1504599/2018, had an intravenous pathogenicity index score of 3.0 and showed a 50% chicken lethal dose of 102.5 EID50 /0.1 ml, indicating high pathogenicity. The isolated viruses exhibited no critical substitution in the markers associated with mammalian adaptation, but possess markers related to neuraminidase inhibitor resistance. These results emphasize the need for ongoing surveillance of circulating influenza virus in South-East Asia, including Laos, to better prepare for and mitigate global spread of H5 HPAI.
Collapse
Affiliation(s)
- Yu-Ri Park
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea.,College of Veterinary Medicine, Animal Disease Intervention Center, Kyungpook National University, Daegu, Korea
| | - Yu-Na Lee
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea
| | - Dong-Hun Lee
- Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, CT, USA
| | - Yoon-Gi Baek
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea
| | - Young-Jae Si
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea
| | | | | | | | - Soo-Jeong Kye
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea
| | - Myoung-Heon Lee
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea
| | - Choi-Kyu Park
- College of Veterinary Medicine, Animal Disease Intervention Center, Kyungpook National University, Daegu, Korea
| | - Youn-Jeong Lee
- Avian Influenza Research Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon, Korea
| |
Collapse
|
14
|
Pruvot M, Khammavong K, Milavong P, Philavong C, Reinharz D, Mayxay M, Rattanavong S, Horwood P, Dussart P, Douangngeun B, Theppangna W, Fine AE, Olson SH, Robinson M, Newton P. Toward a quantification of risks at the nexus of conservation and health: The case of bushmeat markets in Lao PDR. Sci Total Environ 2019; 676:732-745. [PMID: 31054417 PMCID: PMC7112076 DOI: 10.1016/j.scitotenv.2019.04.266] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/16/2019] [Accepted: 04/17/2019] [Indexed: 04/14/2023]
Abstract
Trade of bushmeat and other wildlife for human consumption presents a unique set of challenges to policy-makers who are confronted with multiple trade-offs between conservation, food security, food safety, culture and tradition. In the face of these complex issues, risk assessments supported by quantitative information would facilitate evidence-based decision making. We propose a conceptual model for disease transmission risk analysis, inclusive of these multiple other facets. To quantify several processes included in this conceptual model we conducted questionnaire surveys with wildlife consumers and vendors in semi-urban centers in Lao People's Democratic Republic (Lao PDR, Laos) and direct observations of consumer behaviors. Direct observation of market stalls indicated an estimated average of 10 kg bushmeat biomass per stall per hour. The socio-demographic data suggested that consumption of bushmeat in urban areas was not for subsistence but rather driven by dietary preference and tradition. Consumer behavioral observations indicated that each animal receives an average of 7 contacts per hour. We provide other key parameters to estimate the risk of disease transmission from bushmeat consumption and illustrate their use in assessing the total public health and socio-economic impact of bushmeat consumption. Pursuing integrative approaches to the study of bushmeat consumption is essential to develop effective and balanced policies that support conservation, public health, and rural development goals.
Collapse
Affiliation(s)
- Mathieu Pruvot
- Wildlife Conservation Society, Wildlife Health Program, 2300 Southern Blvd, Bronx, NY 10460, USA.
| | - Kongsy Khammavong
- Wildlife Conservation Society, Lao PDR Program, Vientiane, Lao Democratic People's Republic
| | - Phonesavanh Milavong
- Wildlife Conservation Society, Lao PDR Program, Vientiane, Lao Democratic People's Republic
| | | | - Daniel Reinharz
- Institut de la Francophonie pour la Médecine Tropicale, Vientiane, Lao Democratic People's Republic; Département de Médecine sociale et préventive, Université Laval, Québec, Canada
| | - Mayfong Mayxay
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Vientiane, Lao Democratic People's Republic; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Sayapeth Rattanavong
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Vientiane, Lao Democratic People's Republic
| | - Paul Horwood
- Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Australia; Institut Pasteur du Cambodge, Phnom Penh, Cambodia
| | | | - Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao Democratic People's Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao Democratic People's Republic
| | - Amanda E Fine
- Wildlife Conservation Society, Wildlife Health Program, 2300 Southern Blvd, Bronx, NY 10460, USA
| | - Sarah H Olson
- Wildlife Conservation Society, Wildlife Health Program, 2300 Southern Blvd, Bronx, NY 10460, USA
| | - Matthew Robinson
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Vientiane, Lao Democratic People's Republic; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Paul Newton
- Lao-Oxford-Mahosot Hospital Wellcome Trust Research Unit, Vientiane, Lao Democratic People's Republic; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| |
Collapse
|
15
|
Burns RJL, Douangngeun B, Theppangna W, Mukaka M, Wegner MD, Windsor PA, Blacksell SD. Peste des Petits Ruminants (PPR) virus serological surveillance in goats in Lao PDR: Issues for disease eradication in a low-resource disease-free setting. Transbound Emerg Dis 2019; 66:939-947. [PMID: 30578618 PMCID: PMC6850323 DOI: 10.1111/tbed.13109] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 11/18/2018] [Accepted: 11/30/2018] [Indexed: 12/26/2022]
Abstract
Peste des Petits ruminants (PPR) is an economically important transboundary viral disease of goats. This study aimed to determine a baseline of serological evidence for Peste des petits ruminants virus (PPRV) in Lao goats. A total of 1,072 serum samples were collected by convenience sampling across five provinces in Laos and tested for antibody response to PPRV using a commercially available competitive ELISA. Positive antibody responses were found in 2.2% (95% CI 1.4, 3.2) of the samples. True prevalence calculations indicated a total overall sample prevalence of 1.7% (95% CI 0.9, 2.8). The highest provincial seroprevalences were Xiangkhouang (3.5%, 95% CI 1.6, 6.9) and Xayaboury (2.9% (95% CI 1.3, 5.7). There was no association between antibody response and each of the following factors: location, breed, gender or age. Considering the apparent absence of disease manifestation of PPR in Laos, likely explanations for the antibody positivity could include cross reaction to other Morbilliviruses such as Measles or Canine Distemper, importation of pre-vaccinated goats, need for test cut-off re-evaluation to be region specific, or a subclinical and a less virulent circulating virus. This study highlights that the sampled Lao goat population is highly likely to be naïve to PPRV and therefore at risk of an outbreak, possibly by transboundary incursion of livestock from PPR endemic China. Further work is required in the testing of small ruminants in Laos that may eventually provide evidence for a status of freedom from disease, particularly in support of programs aimed at global PPR eradication.
Collapse
Affiliation(s)
| | - Bounlom Douangngeun
- National Animal Health LaboratoryDepartment of Livestock and FisheriesMinistry of AgricultureVientianeLao People's Democratic Republic
| | - Watthana Theppangna
- National Animal Health LaboratoryDepartment of Livestock and FisheriesMinistry of AgricultureVientianeLao People's Democratic Republic
| | - Mavuto Mukaka
- Mahidol‐Oxford Tropical Medicine Research UnitFaculty of Tropical MedicineMahidol UniversityBangkokThailand
- Centre for Tropical Medicine & Global HealthNuffield Department of MedicineUniversity of OxfordOxfordUK
| | - Matthew D. Wegner
- United States Army Medical Directorate ‐ Armed Forces Research Institute of Medical SciencesBangkokThailand
| | - Peter A. Windsor
- Sydney School of Veterinary ScienceUniversity of SydneyCamdenAustralia
| | - Stuart D. Blacksell
- Mahidol‐Oxford Tropical Medicine Research UnitFaculty of Tropical MedicineMahidol UniversityBangkokThailand
- Centre for Tropical Medicine & Global HealthNuffield Department of MedicineUniversity of OxfordOxfordUK
- Lao‐Oxford‐Mahosot Hospital‐Wellcome Trust Research Unit (LOMWRU)Mahosot HospitalVientianeLao People's Democratic Republic
| |
Collapse
|
16
|
Douangngeun B, Theppangna W, Phommachanh P, Chomdara K, Phiphakhavong S, Khounsy S, Mukaka M, Dance DAB, Blacksell SD. Rabies surveillance in dogs in Lao PDR from 2010-2016. PLoS Negl Trop Dis 2017; 11:e0005609. [PMID: 28570561 PMCID: PMC5469496 DOI: 10.1371/journal.pntd.0005609] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 06/13/2017] [Accepted: 04/28/2017] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Rabies is a fatal viral disease that continues to threaten both human and animal health in endemic countries. The Lao People's Democratic Republic (Lao PDR) is a rabies-endemic country in which dogs are the main reservoir and continue to present health risks for both human and animals throughout the country. METHODS Passive, laboratory-based rabies surveillance was performed for suspected cases of dog rabies in Vientiane Capital during 2010-2016 and eight additional provinces between 2015-2016 using the Direct Fluorescent Antibody Test (DFAT). RESULTS There were 284 rabies positive cases from 415 dog samples submitted for diagnosis. 257 cases were from Vientiane Capital (2010-2016) and the remaining 27 cases were submitted during 2015-2016 from Champassak (16 cases), Vientiane Province (4 cases), Xieng Kuang (3 cases), Luang Prabang (2 cases), Saravan (1 case), Saisomboun (1 case) and Bokeo (1 case). There was a significant increase in rabies cases during the dry season (p = 0.004) (November to April; i.e., <100mm of rainfall per month). No significant differences were noted between age, sex, locality of rabies cases. CONCLUSION The use of laboratory-based rabies surveillance is a useful method of monitoring rabies in Lao PDR and should be expanded to other provincial centers, particularly where there are active rabies control programs.
Collapse
Affiliation(s)
- Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao People’s Democratic Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao People’s Democratic Republic
| | - Phouvong Phommachanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao People’s Democratic Republic
| | - Keo Chomdara
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao People’s Democratic Republic
| | - Sithong Phiphakhavong
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao People’s Democratic Republic
| | - Syseng Khounsy
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Ban Khunta, Vientiane, Lao People’s Democratic Republic
| | - Mavuto Mukaka
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Old Road Campus, Oxford, United Kingdom
| | - David A. B. Dance
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Old Road Campus, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Stuart D. Blacksell
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Old Road Campus, Oxford, United Kingdom
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Mahosot Hospital, Vientiane, Lao People’s Democratic Republic
| |
Collapse
|
17
|
Lacroix A, Duong V, Hul V, San S, Davun H, Omaliss K, Chea S, Hassanin A, Theppangna W, Silithammavong S, Khammavong K, Singhalath S, Afelt A, Greatorex Z, Fine AE, Goldstein T, Olson S, Joly DO, Keatts L, Dussart P, Frutos R, Buchy P. Diversity of bat astroviruses in Lao PDR and Cambodia. Infect Genet Evol 2016; 47:41-50. [PMID: 27871796 PMCID: PMC7106329 DOI: 10.1016/j.meegid.2016.11.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/12/2016] [Accepted: 11/14/2016] [Indexed: 12/24/2022]
Abstract
Astroviruses are known to infect humans and a wide range of animal species, and can cause gastroenteritis in their hosts. Recent studies have reported astroviruses in bats in Europe and in several locations in China. We sampled 1876 bats from 17 genera at 45 sites from 14 and 13 provinces in Cambodia and Lao PDR respectively, and tested them for astroviruses. Our study revealed a high diversity of astroviruses among various Yangochiroptera and Yinpterochiroptera bats. Evidence for varying degrees of host restriction for astroviruses in bats was found. Furthermore, additional Pteropodid hosts were detected. The astroviruses formed distinct phylogenetic clusters within the genus Mamastrovirus, most closely related to other known bat astroviruses. The astrovirus sequences were found to be highly saturated indicating that phylogenetic relationships should be interpreted carefully. An astrovirus clustering in a group with other viruses from diverse hosts, including from ungulates and porcupines, was found in a Rousettus bat. These findings suggest that diverse astroviruses can be found in many species of mammals, including bats. Diverse astroviruses detected in bats in Lao PDR and Cambodia High polymorphism of astroviruses found in insectivorous and frugivorous bats High level of genome saturation and hypermutation potential evidenced in astrovirus Detection of additional astrovirus bat hosts, i.e. nectar bats from the genus Eonycteris Discovery of a new species of astrovirus in fruit bats (Rousettus sp.)
Collapse
Affiliation(s)
- Audrey Lacroix
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia
| | - Veasna Duong
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia
| | - Vibol Hul
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia
| | - Sorn San
- National Veterinary Research Institute, Department of Animal Health and Production, Ministry of Agriculture Forestry and Fisheries, Cambodia
| | - Holl Davun
- National Veterinary Research Institute, Department of Animal Health and Production, Ministry of Agriculture Forestry and Fisheries, Cambodia
| | - Keo Omaliss
- Forest Administration, Ministry of Agriculture Forestry and Fisheries, Cambodia
| | | | - Alexandre Hassanin
- Institut de Systématique, Evolution, Biodiversité (ISYEB), UMR 7205 MNHN CNRS UPMC, EPHE, Muséum national d'Histoire naturelle, Paris, France; Muséum national d'Histoire naturelle, Institut de Systématique, Evolution, Biodiversité (ISYEB), UMR 7205 MNHN CNRS UPMC, France
| | - Watthana Theppangna
- National Animal Health Laboratory, Ministry of Agriculture Forestry and Fisheries, Laos
| | | | | | | | - Aneta Afelt
- Institute of Physical Geography, Faculty of Geography and Regional Studies, University of Warsaw, Warsaw, Poland
| | | | - Amanda E Fine
- Wildlife Conservation Society, Wildlife Health Program, Bronx, N.Y., USA
| | - Tracey Goldstein
- One Health Institute, School of Veterinary Medicine, University of California, Davis, USA
| | - Sarah Olson
- Wildlife Conservation Society, Wildlife Health Program, Bronx, N.Y., USA
| | - Damien O Joly
- Wildlife Conservation Society, Wildlife Health Program, Bronx, N.Y., USA; Metabiota Inc., Nanaimo, British Columbia, Canada
| | | | - Philippe Dussart
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia
| | - Roger Frutos
- Cirad, UMR 17, Cirad-Ird, TA-A17/G, Montpellier, France; Université de Montpellier, IES, UMR 5214, CNRS-UM, Montpellier, France.
| | - Philippe Buchy
- Institut Pasteur du Cambodge, Virology Unit, Phnom Penh, Cambodia; GSK Vaccines R&D, 150 Beach road, # 22-00, 189720, Singapore.
| |
Collapse
|
18
|
Douangngeun B, Theppangna W, Soukvilay V, Senaphanh C, Phithacthep K, Phomhaksa S, Yingst S, Lombardini E, Hansson E, Selleck PW, Blacksell SD. Seroprevalence of Q Fever, Brucellosis, and Bluetongue in Selected Provinces in Lao People's Democratic Republic. Am J Trop Med Hyg 2016; 95:558-561. [PMID: 27430548 PMCID: PMC5014259 DOI: 10.4269/ajtmh.15-0913] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 06/07/2016] [Indexed: 11/07/2022] Open
Abstract
This study has determined the proportional seropositivity of two zoonotic diseases, Q fever and brucellosis, and bluetongue virus (BTV) which is nonzoonotic, in five provinces of Lao People's Democratic Republic (PDR) (Loungphabang, Luangnumtha, Xayaboury, Xiengkhouang, and Champasak, and Vientiane Province and Vientiane capital). A total of 1,089 samples from buffalo, cattle, pigs, and goats were tested, with seropositivity of BTV (96.7%), Q fever (1.2%), and brucellosis (0.3%). The results of this survey indicated that Q fever seropositivity is not widely distributed in Lao PDR; however, Xayaboury Province had a cluster of seropositive cattle in seven villages in four districts (Botan, Kenthao, Paklaiy, and Phiang) that share a border with Thailand. Further studies are required to determine if Xayaboury Province is indeed an epidemiological hot spot of Q fever activity. There is an urgent need to determine the levels of economic loss and human health-related issues caused by Q fever, brucellosis, and BTV in Lao PDR.
Collapse
Affiliation(s)
- Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Vilayvahn Soukvilay
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Chanthana Senaphanh
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Kamphok Phithacthep
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Souk Phomhaksa
- National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture and Forestry, Vientiane, Lao People's Democratic Republic
| | - Samuel Yingst
- Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Eric Lombardini
- Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Eric Hansson
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Paul W Selleck
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Stuart D Blacksell
- Microbiology Laboratory, Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Mahosot Hospital, Vientiane, Lao People's Democratic Republic.,Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine, Nuffield Department of Clinical Medicine, Churchill Hospital, Oxford, United Kingdom
| |
Collapse
|
19
|
Greatorex ZF, Olson SH, Singhalath S, Silithammavong S, Khammavong K, Fine AE, Weisman W, Douangngeun B, Theppangna W, Keatts L, Gilbert M, Karesh WB, Hansel T, Zimicki S, O’Rourke K, Joly DO, Mazet JAK. Wildlife Trade and Human Health in Lao PDR: An Assessment of the Zoonotic Disease Risk in Markets. PLoS One 2016; 11:e0150666. [PMID: 27008628 PMCID: PMC4805265 DOI: 10.1371/journal.pone.0150666] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 02/16/2016] [Indexed: 01/30/2023] Open
Abstract
Although the majority of emerging infectious diseases can be linked to wildlife sources, most pathogen spillover events to people could likely be avoided if transmission was better understood and practices adjusted to mitigate risk. Wildlife trade can facilitate zoonotic disease transmission and represents a threat to human health and economies in Asia, highlighted by the 2003 SARS coronavirus outbreak, where a Chinese wildlife market facilitated pathogen transmission. Additionally, wildlife trade poses a serious threat to biodiversity. Therefore, the combined impacts of Asian wildlife trade, sometimes termed bush meat trade, on public health and biodiversity need assessing. From 2010 to 2013, observational data were collected in Lao PDR from markets selling wildlife, including information on volume, form, species and price of wildlife; market biosafety and visitor origin. The potential for traded wildlife to host zoonotic diseases that pose a serious threat to human health was then evaluated at seven markets identified as having high volumes of trade. At the seven markets, during 21 observational surveys, 1,937 alive or fresh dead mammals (approximately 1,009 kg) were observed for sale, including mammals from 12 taxonomic families previously documented to be capable of hosting 36 zoonotic pathogens. In these seven markets, the combination of high wildlife volumes, high risk taxa for zoonoses and poor biosafety increases the potential for pathogen presence and transmission. To examine the potential conservation impact of trade in markets, we assessed the status of 33,752 animals observed during 375 visits to 93 markets, under the Lao PDR Wildlife and Aquatic Law. We observed 6,452 animals listed by Lao PDR as near extinct or threatened with extinction. The combined risks of wildlife trade in Lao PDR to human health and biodiversity highlight the need for a multi-sector approach to effectively protect public health, economic interests and biodiversity.
Collapse
Affiliation(s)
- Zoe F. Greatorex
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
- * E-mail: (ZFG); (SHO)
| | - Sarah H. Olson
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
- University of Wisconsin Madison, Center for Sustainability and the Global Environment, Madison, Wisconsin, United States of America
- * E-mail: (ZFG); (SHO)
| | - Sinpakone Singhalath
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Soubanh Silithammavong
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Kongsy Khammavong
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Amanda E. Fine
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Wendy Weisman
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Bounlom Douangngeun
- National Animal Health Laboratory, Department of Livestock and Fisheries, Vientiane, Lao PDR
| | - Watthana Theppangna
- National Animal Health Laboratory, Department of Livestock and Fisheries, Vientiane, Lao PDR
| | - Lucy Keatts
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Martin Gilbert
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - William B. Karesh
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Troy Hansel
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Susan Zimicki
- FHI360, Washington, District of Colombia, United States of America
| | | | - Damien O. Joly
- Wildlife Conservation Society, Wildlife Health & Health Policy Program, Bronx, New York, United States of America
| | - Jonna A. K. Mazet
- One Health Institute, School of Veterinary Medicine, University of California, Davis, California, United States of America
| |
Collapse
|
20
|
Kamsing A, Nasipaseuth P, Archkhawong S, Southalack K, Theppangna W, Khamphaphongphane B, Phounphenghaek K, Kounnavong B, Phengxay M, Dusan F. A review of rabies surveillance and response activities in Lao PDR to 2011. Int J Infect Dis 2012. [DOI: 10.1016/j.ijid.2012.05.649] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
|
21
|
Theppangna W, Otsuki K, Murase T. Inhibitory effects of Enterococcus strains obtained from a probiotic product on in vitro growth of Salmonella enterica serovar enteritidis strain IFO3313. J Food Prot 2006; 69:2258-62. [PMID: 16995534 DOI: 10.4315/0362-028x-69.9.2258] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Enterococcus faecium and Enterococcus gallinarum strains were isolated from a commercial probiotic product and the effects of these strains on the growth of Salmonella enterica serovar Enteritidis strain IFO3313 were investigated. Viable cell counts of Salmonella Enteritidis in mixed cultures with the probiotic product isolate of E. faecium were significantly (P < 0.05) lower than those in pure cultures after 6, 8, and 24 h when the cultures were incubated in heart infusion broth at 37 and 41 degrees C. Significant differences in viable cell counts of Salmonella Enteritidis in mixed cultures with the probiotic product isolate of E. gallinarum and those in pure cultures were also observed after 8 and 24 h at 37 and 41degrees C. Similar observations were shown in mixed cultures of Salmonella Enteritidis with the reference strains of E. faecium GIFU8355 and E. gallinarum ATCC 49573. Significant differences in viable cell counts of these enterococcal strains were not shown among pure and mixed cultures with Salmonella Enteritidis. The pH values in pure and mixed cultures were 7.0 or 7.5 throughout the experiments. E. faecium strains were found to harbor the genes encoding enterocins A and B and showed inhibitory zones with a diameter of 4 to 6 mm against growth of Salmonella Enteritidis in the enterocin production assays. However, the E. gallinarum strains possessed neither of the enterocin genes tested and exhibited no inhibition zone in the enterocin production assays. These results indicated that enterococcal strains exhibit inhibitory effects on the growth of Salmonella Enteritidis and these effects were due to both enterocin and nonenterocin factors.
Collapse
Affiliation(s)
- Watthana Theppangna
- Laboratory of Veterinary Microbiology, Faculty of Agriculture, Tottori University, 4-101 Koyama, Tottori 680-8553, Japan
| | | | | |
Collapse
|