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The urban myth: A lack of agreement between definitions of urban environments used in wildlife health research may contribute to inconsistent epidemiological findings. Urban Ecosyst 2022. [DOI: 10.1007/s11252-022-01213-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Smith OM, Snyder WE, Owen JP. Are we overestimating risk of enteric pathogen spillover from wild birds to humans? Biol Rev Camb Philos Soc 2020; 95:652-679. [PMID: 32003106 PMCID: PMC7317827 DOI: 10.1111/brv.12581] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 01/08/2020] [Accepted: 01/13/2020] [Indexed: 01/07/2023]
Abstract
Enteric illnesses remain the second largest source of communicable diseases worldwide, and wild birds are suspected sources for human infection. This has led to efforts to reduce pathogen spillover through deterrence of wildlife and removal of wildlife habitat, particularly within farming systems, which can compromise conservation efforts and the ecosystem services wild birds provide. Further, Salmonella spp. are a significant cause of avian mortality, leading to additional conservation concerns. Despite numerous studies of enteric bacteria in wild birds and policies to discourage birds from food systems, we lack a comprehensive understanding of wild bird involvement in transmission of enteric bacteria to humans. Here, we propose a framework for understanding spillover of enteric pathogens from wild birds to humans, which includes pathogen acquisition, reservoir competence and bacterial shedding, contact with people and food, and pathogen survival in the environment. We place the literature into this framework to identify important knowledge gaps. Second, we conduct a meta‐analysis of prevalence data for three human enteric pathogens, Campylobacter spp., E. coli, and Salmonella spp., in 431 North American breeding bird species. Our literature review revealed that only 3% of studies addressed the complete system of pathogen transmission. In our meta‐analysis, we found a Campylobacter spp. prevalence of 27% across wild birds, while prevalence estimates of pathogenic E. coli (20%) and Salmonella spp. (6.4%) were lower. There was significant bias in which bird species have been tested, with most studies focusing on a small number of taxa that are common near people (e.g. European starlings Sturnus vulgaris and rock pigeons Columba livia) or commonly in contact with human waste (e.g. gulls). No pathogen prevalence data were available for 65% of North American breeding bird species, including many commonly in contact with humans (e.g. black‐billed magpie Pica hudsonia and great blue heron Ardea herodias), and our metadata suggest that some under‐studied species, taxonomic groups, and guilds may represent equivalent or greater risk to human infection than heavily studied species. We conclude that current data do not provide sufficient information to determine the likelihood of enteric pathogen spillover from wild birds to humans and thus preclude management solutions. The primary focus in the literature on pathogen prevalence likely overestimates the probability of enteric pathogen spillover from wild birds to humans because a pathogen must survive long enough at an infectious dose and be a strain that is able to colonize humans to cause infection. We propose that future research should focus on the large number of under‐studied species commonly in contact with people and food production and demonstrate shedding of bacterial strains pathogenic to humans into the environment where people may contact them. Finally, studies assessing the duration and intensity of bacterial shedding and survival of bacteria in the environment in bird faeces will help provide crucial missing information necessary to calculate spillover probability. Addressing these essential knowledge gaps will support policy to reduce enteric pathogen spillover to humans and enhance bird conservation efforts that are currently undermined by unsupported fears of pathogen spillover from wild birds.
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Affiliation(s)
- Olivia M Smith
- School of Biological Sciences, Washington State University, P.O. Box 644236, Pullman, WA, 99164, U.S.A
| | - William E Snyder
- Department of Entomology, Washington State University, 100 Dairy Road, P.O. Box 646382, Pullman, WA, 99164, U.S.A
| | - Jeb P Owen
- Department of Entomology, Washington State University, 100 Dairy Road, P.O. Box 646382, Pullman, WA, 99164, U.S.A
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Beleza AJF, Maciel WC, Lopes EDS, Albuquerque ÁHD, Carreira AS, Nogueira CHG, Bandeira JDM, Vasconcelos RH, Teixeira RSDC. Evidence of the role of free-living birds as disseminators of Salmonella spp. ARQUIVOS DO INSTITUTO BIOLÓGICO 2020. [DOI: 10.1590/1808-1657000462019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
ABSTRACT This study aimed to review aspects of Salmonella spp. in free-living birds and their potential as disseminators for domestic animals, man, and the environment. Isolation of Salmonella spp. have been reported in several species of wild birds from Passeridae and Fringillidae, among other avian families, captured in countries of North America and Europe, where Salmonella ser. Typhimurium is the most frequently reported serotype. The presence of pathogens, including Salmonella, may be influenced by several factors, such as diet, environment, exposure to antibiotics, infection by pathogenic organisms and migration patterns. Researches with wild birds that live in urbanized environment are important, considering that birds may participate in the transmission of zoonotic pathogens, which are more prevalent in cities due to the human activity. Based on the information collected, this article concludes that wild birds are still important disseminators of pathogens in several geographic regions and may affect man, domestic animals, and other birds.
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Martín-Maldonado B, Montoro-Dasi L, Pérez-Gracia MT, Jordá J, Vega S, Marco-Jiménez F, Marin C. Wild Bonelli's eagles (Aquila fasciata) as carrier of antimicrobial resistant Salmonella and Campylobacter in Eastern Spain. Comp Immunol Microbiol Infect Dis 2019; 67:101372. [PMID: 31629291 DOI: 10.1016/j.cimid.2019.101372] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 10/06/2019] [Accepted: 10/08/2019] [Indexed: 12/19/2022]
Abstract
Wild birds have repeatedly been found to be involved in the dissemination of enteric bacterial pathogens in the environment. The aim of this study was to determine the occurrence of Salmonella and Campylobacter as well as the antimicrobial resistance in wild Bonelli's eagles nestlings in Eastern Spain. In addition, we compared the efficiency of two sampling methods (fresh faecal samples from nest and cloacal swabs from nestlings) for detection of both bacteria. A total of 28 nests with 45 nestlings were analysed. In the nest, Salmonella occurrence was 61 ± 9.2%, while Campylobacter occurrence was 11 ± 5.8% (p < 0.05). In the nestlings, Salmonella occurrence was 36 ± 7.1%, while Campylobacter occurrence was 11 ± 4.7% (p < 0.05). Eight Salmonella serovars were identified, and the most frequently isolated were S. Enteritidis, S. Typhimurium, S. Houston, and S. Cerro. Only one Campylobacter species was identified (C. jejuni). Regarding antimicrobial resistance, the Salmonella strains isolated were found to be most frequently resistant to ampicillin and to tigecycline; however, the sole Campylobacter strain recovered was multidrug resistant. In conclusion, this study demonstrated that wild Bonelli's eagles nestlings are greater carriers of Salmonella than of Campylobacter. Both Salmonella and Campylobacter isolates exhibited antimicrobial resistance. In addition, faecal samples from nests were most reliable for Salmonella detection, while cloacal swab from nestlings were most reliable for Campylobacter detection.
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Affiliation(s)
- Bárbara Martín-Maldonado
- GEMAS (Study Group on Wildlife Medicine and Conservation), Spain; Hospital Veterinario de Fauna Silvestre de GREFA. Majadahonda, Madrid, Spain
| | - Laura Montoro-Dasi
- Instituto de Ciencias Biomédicas. Universidad Cardenal Herrera-CEU, CEU Universities, C/Tirant Lo Blanc 7, 46115, Alfara del Patriarca, Valencia, Spain; Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de València, 46022, Valencia, Spain
| | - Maria Teresa Pérez-Gracia
- Instituto de Ciencias Biomédicas. Universidad Cardenal Herrera-CEU, CEU Universities, C/Tirant Lo Blanc 7, 46115, Alfara del Patriarca, Valencia, Spain
| | - Jaume Jordá
- Instituto de Ciencias Biomédicas. Universidad Cardenal Herrera-CEU, CEU Universities, C/Tirant Lo Blanc 7, 46115, Alfara del Patriarca, Valencia, Spain
| | - Santiago Vega
- GEMAS (Study Group on Wildlife Medicine and Conservation), Spain; Instituto de Ciencias Biomédicas. Universidad Cardenal Herrera-CEU, CEU Universities, C/Tirant Lo Blanc 7, 46115, Alfara del Patriarca, Valencia, Spain
| | - Francisco Marco-Jiménez
- Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de València, 46022, Valencia, Spain
| | - Clara Marin
- GEMAS (Study Group on Wildlife Medicine and Conservation), Spain; Instituto de Ciencias Biomédicas. Universidad Cardenal Herrera-CEU, CEU Universities, C/Tirant Lo Blanc 7, 46115, Alfara del Patriarca, Valencia, Spain.
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Brobey B, Kucknoor A, Armacost J. Prevalence of Trichomonas, Salmonella, and Listeria in Wild Birds from Southeast Texas. Avian Dis 2018; 61:347-352. [PMID: 28957011 DOI: 10.1637/11607-020617-regr] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Infectious diseases can be a major threat to wildlife populations, especially in human-modified habitats, but infection rates in populations of wild animals are often poorly studied. Trichomonas, Salmonella, and Listeria are all pathogens known to infect birds, but their infection rates in wild bird populations are not well documented. This study documents infection rates of the three pathogens in wild bird populations inhabiting a suburban to rural gradient in Southeast Texas. Various species of wild birds were sampled at five sites in Southeastern Texas representing rural (<1 house per ha), exurban (approximately 1 house per ha), and suburban (approximately 10 houses per ha) habitat types. Birds were captured in mist nets and samples were taken from the oral cavity, crop, and vent to detect the presence of pathogens. Samples were screened for Trichomonas by examining wet mounts under a light microscope, whereas samples were screened for Salmonella and Listeria by examining colonies grown on agar plates. Pathogens detected during the initial screening were further confirmed by PCR and DNA sequencing. Infection rates for Trichomonas, Salmonella, and Listeria were 9%, 17%, and 5%, respectively. The distributions of infection rates across habitats (i.e., rural, exurban, rural) did not differ significantly from the expected null distributions for any of the three pathogens; however, the data suggested some interesting patterns that should be confirmed with a larger dataset. Infection rates for Trichomonas and Salmonella were highest at the suburban sites, whereas the infection rate for Listeria was highest at the rural site. Feeder birds were more likely to be infected by all three pathogens than non-feeder birds. Small sample sizes prevent definitive conclusions regarding variation in infection rates along the suburban to rural gradient, but the results suggest that pathogens followed the predicted patterns. For many of the bird species sampled, this study presents the first report of infection rates by these three pathogens in wild populations.
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Affiliation(s)
- Britni Brobey
- A Department of Biology, Lamar University, Beaumont, TX 77710
| | | | - Jim Armacost
- A Department of Biology, Lamar University, Beaumont, TX 77710
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Rouffaer LO, Strubbe D, Teyssier A, Salleh Hudin N, Van den Abeele AM, Cox I, Haesendonck R, Delmée M, Haesebrouck F, Pasmans F, Lens L, Martel A. Effects of urbanization on host-pathogen interactions, using Yersinia in house sparrows as a model. PLoS One 2017; 12:e0189509. [PMID: 29281672 PMCID: PMC5744950 DOI: 10.1371/journal.pone.0189509] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 11/28/2017] [Indexed: 12/01/2022] Open
Abstract
Urbanization strongly affects biodiversity, altering natural communities and often leading to a reduced species richness. Yet, despite its increasingly recognized importance, how urbanization impacts on the health of individual animals, wildlife populations and on disease ecology remains poorly understood. To test whether, and how, urbanization-driven ecosystem alterations influence pathogen dynamics and avian health, we use house sparrows (Passer domesticus) and Yersinia spp. (pathogenic for passerines) as a case study. Sparrows are granivorous urban exploiters, whose western European populations have declined over the past decades, especially in highly urbanized areas. We sampled 329 house sparrows originating from 36 populations along an urbanization gradient across Flanders (Belgium), and used isolation combined with 'matrix-assisted laser desorption ionization- time of flight mass spectrometry' (MALDI-TOF MS) and PCR methods for detecting the presence of different Yersinia species. Yersinia spp. were recovered from 57.43% of the sampled house sparrows, of which 4.06%, 53.30% and 69.54% were identified as Y. pseudotuberculosis, Y. enterocolitica and other Yersinia species, respectively. Presence of Yersinia was related to the degree of urbanization, average daily temperatures and the community of granivorous birds present at sparrow capture locations. Body condition of suburban house sparrows was found to be higher compared to urban and rural house sparrows, but no relationships between sparrows' body condition and presence of Yersinia spp. were found. We conclude that two determinants of pathogen infection dynamics, body condition and pathogen occurrence, vary along an urbanization gradient, potentially mediating the impact of urbanization on avian health.
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Affiliation(s)
- Lieze Oscar Rouffaer
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Diederik Strubbe
- Department of Biology (Terrestrial Ecology Unit), Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Aimeric Teyssier
- Department of Biology (Terrestrial Ecology Unit), Faculty of Sciences, Ghent University, Ghent, Belgium
- Department of Biology, Faculty of Science, Antwerp University, Antwerp, Belgium
| | - Noraine Salleh Hudin
- Department of Biology (Terrestrial Ecology Unit), Faculty of Sciences, Ghent University, Ghent, Belgium
- Department of Biological Sciences, Faculty of Science & Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, Perak, Malaysia
| | | | - Ivo Cox
- Microbiology Laboratory, AZ Sint Lucas Ghent, Ghent, Belgium
| | - Roel Haesendonck
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Michel Delmée
- Institute of Experimental and Clinical Research, Université Catholique de Louvain, Brussels, Belgium
| | - Freddy Haesebrouck
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Frank Pasmans
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Luc Lens
- Department of Biology (Terrestrial Ecology Unit), Faculty of Sciences, Ghent University, Ghent, Belgium
| | - An Martel
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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Boonyarittichaikij R, Verbrugghe E, Dekeukeleire D, De Beelde R, Rouffaer LO, Haesendonck R, Strubbe D, Mattheus W, Bertrand S, Pasmans F, Bonte D, Verheyen K, Lens L, Martel A. Salmonella Typhimurium DT193 and DT99 are present in great and blue tits in Flanders, Belgium. PLoS One 2017; 12:e0187640. [PMID: 29112955 PMCID: PMC5675436 DOI: 10.1371/journal.pone.0187640] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 10/23/2017] [Indexed: 11/29/2022] Open
Abstract
Endemic infections with the common avian pathogen Salmonella enterica subspecies enterica serovar Typhimurium (Salmonella Typhimurium) may incur a significant cost on the host population. In this study, we determined the potential of endemic Salmonella infections to reduce the reproductive success of blue (Cyanistes caeruleus) and great (Parus major) tits by correlating eggshell infection with reproductive parameters. The fifth egg of each clutch was collected from nest boxes in 19 deciduous forest fragments. Out of the 101 sampled eggs, 7 Salmonella Typhimurium isolates were recovered. The low bacterial prevalence was reflected by a similarly low serological prevalence in the fledglings. In this study with a relatively small sample size, presence of Salmonella did not affect reproductive parameters (egg volume, clutch size, number of nestlings and number of fledglings), nor the health status of the fledglings. However, in order to clarify the impact on health and reproduction a larger number of samples have to be analyzed. Phage typing showed that the isolates belonged to the definitive phage types (DT) 193 and 99, and multi-locus variable number tandem repeat analysis (MLVA) demonstrated a high similarity among the tit isolates, but distinction to human isolates. These findings suggest the presence of passerine-adapted Salmonella strains in free-ranging tit populations with host pathogen co-existence.
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Affiliation(s)
- R. Boonyarittichaikij
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
- Department of Clinical Sciences and Public Health, Faculty of Veterinary Science, Mahidol University, Phuttamonthon, Nakhon Pathom, Thailand
| | - E. Verbrugghe
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
| | - D. Dekeukeleire
- Terrestrial Ecology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, Gent, Belgium
| | - R. De Beelde
- Terrestrial Ecology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, Gent, Belgium
- Forest & Nature Laboratory, Department Forest and Water Management, Ghent University, Gontrode, Belgium
| | - L. O. Rouffaer
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
| | - R. Haesendonck
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
| | - D. Strubbe
- Terrestrial Ecology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, Gent, Belgium
- Center for Macroecology, Evolution and Climate, Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark
| | - W. Mattheus
- NRC Salmonella and Shigella Bacterial Diseases Division, Scientific Institute of Public Health, Juliette Wytsmanstraat 14, Brussels, Belgium
| | - S. Bertrand
- NRC Salmonella and Shigella Bacterial Diseases Division, Scientific Institute of Public Health, Juliette Wytsmanstraat 14, Brussels, Belgium
| | - F. Pasmans
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
| | - D. Bonte
- Terrestrial Ecology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, Gent, Belgium
| | - K. Verheyen
- Forest & Nature Laboratory, Department Forest and Water Management, Ghent University, Gontrode, Belgium
| | - L. Lens
- Terrestrial Ecology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, Gent, Belgium
| | - A. Martel
- Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
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