Abstract
There is presently no vaccine to combat African swine fever (ASF), a viral hemorrhagic fever of domestic pigs that causes up to 100% morbidity and mortality in naive, commercial pig populations. In its endemic setting, ASF virus cycles between asymptomatic warthogs and soft ticks, with persistence in exotic locations being ascribed to the almost global distribution of susceptible soft tick and suid hosts. An understanding of the role played by diverse hosts in the epidemiology of this multi-host disease is crucial for effective disease control. Unlike the intensively studied Ornithodoros tick vector, the role of many wild suids remains obscure, despite growing recognition for suid-exclusive virus cycling, without the agency of the argasid tick, at some localities. Because the four wild suid genera, Phacochoerus, Potamochoerus, Hylochoerus, and Sus differ from each other in taxonomy, distribution, ecology, reservoir host potential, virus shedding, ASF symptomology, and domestic-pig contact potential, their role in disease epidemiology is also varied. This first consolidated summary of ASF epidemiology in relation to wild suids summarizes current knowledge and identifies information gaps and future research priorities crucial for formulating effective disease control strategies.
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References
Alcaraz C, Rodriguez F, Oviedo JM, Eiras A, De Diego M, Alonso C, et al. (1995) Highly specific confirmatory Western blot test for African swine fever virus antibody detection using the recombinant virus protein p54. Journal of Virological Methods 52:111–119
Anderson EC, Hutchings GH, Mukarati N, Wilkinson PJ (1998) African swine fever virus infection of the bushpig (Potamochoerus porcus) and its significance in the epidemiology of the disease. Veterinary Microbiology 62:1–15
Arias ML, Sanchez-Vizcaino JM (2002) African swine fever. In: Trends in Emerging Viral Infections of Swine, Morilla A, Yoon KJ, Zimmermann JF (editors), Ames, IA: Iowa State University Press, pp 119–139
Arnot LF, Du Toit JT, Bastos ADS (2009) Molecular monitoring of African swine fever virus using surveys targeted at adult Ornithodoros ticks: a re-evaluation of Mkuze Game Reserve, South Africa. Onderstepoort Journal of Veterinary Research (in press)
Bastos ADS, Penrith ML, Cruciere C, Edrich J, Hutchings G, Roger F, et al. (2003) Genotyping field strains of African swine fever virus by partial p72 gene characterization. Archives of Virology 148:693–706
Bastos ADS, Arnot LF, Jacquier MD, Maree S (2009) A host-species informative internal control for molecular assessment of African swine fever virus infection rates in the African sylvatic cycle Ornithodoros vector. Medical and Veterinary Entomology. doi:10.1111/j.1365-2915.2009.00828.x
Bech-Nielsen S, Fernandez J, Martinez-Pereda F, Espinosa J, Perez Bonilla Q, Sanchez-Vizcaino JM (1995) A case study of an outbreak of African swine fever in Spain. British Veterinary Journal 151:203–214
Beltran Alcrudo D, Lubroth J, Depner K, De La Rocque S (2008) African swine fever in the Caucasus. Empress Watch 1–8, ftp://ftp.fao.org/docrep/fao/011/aj214e/aj214e00.pdf
Boshoff CI, Bastos ADS, Gerber LJ, Vosloo W (2007) Genetic characterisation of African swine fever viruses from outbreaks in southern Africa (1973–1999). Veterinary Microbiology 121:45–55
Costard S, Wieland B, De Glainville W, Jori F, Rowlands R, Vosloo W, et al. (2009) African swine fever: how can global spread be prevented? Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences (London) 364:2683:2696
Cumming DHM (2005) Superorder Cetartiodactyla, order Suiformes. In: The Mammals of the Southern African Subregion, Skinner J, Chimimba CT (editors), Cambridge, UK: Cambridge University Press, pp 547–555
d'Huart J (1993) The Forest Hog (Hylochoerus meinertzhageni). In: Pigs, Peccaries, and Hippos, Oliver W (editor), Gland, Switzerland: IUCN, pp 84–92
d’Huart JP, Grubb P (2001) Distribution of the common warthog (Phacochoerus africanus) and the desert warthog (Phacochoerus aethiopicus) in the Horn of Africa. African Journal of Zoology 39:29–45
De Tray DE (1959) African swine fever in warthogs (Phacochoerus aethiopicus). Journal of the American Veterinary Medical Association 130:537–540
De Tray DE (1963) African swine fever. Advances in Veterinary Science and Comparative Medicine 19:299–333
Estes RD (2008) The Safari Companion. A Guide to Watching African Mammals. Johannesburg, South Africa: Russell Friedman Books, pp 1–458
Hamblin C, Anderson EC, Jago M, Mlengeya T, Hirji K (1990) Antibodies to some pathogenic agents in free-living wild species in Tanzania. Epidemiology and Infection 105:585–594
Haresnape JM, Lungu SA, Mamu FD (1985) A four year survey of African swine fever in Malawi. Journal of Hygiene (London) 95:309–323
Haresnape JM, Mamu FD (1986) The distribution of ticks of the Ornithodoros moubata complex (Ixodoidea: Argasidae) in Malawi, and its relation to African swine fever epizootiology. Journal of Hygiene (London) 96:535–544
Haresnape JM, Wilkinson PJ, Mellor PS (1988) Isolation of African swine fever virus from ticks of the Ornithodoros moubata complex (Ixodoidea: Argasidae) collected within the African swine fever enzootic area of Malawi. Epidemiology and Infection 101:173–185
Heuschele WP, Coggins L (1969) Epizootiology of African swine fever virus in warthogs. Bulletin of Epizootic Diseases of Africa 17:179–183
Horak IG, Biggs HC, Hanssen TS, Hanssen RE (1983) The prevalence of helminth and arthropod parasites of warthog, Phacochoerus aethiopicus, in south West Africa/Namibia. Onderstepoort Journal of Veterinary Research 50:145–148
Jori F, Vial L, Ravaonamanana J, Le Glaunec G, Etter E, Akakpo J, et al. (2007) The role of wild hosts (wild pigs and ticks) in the epidemiology of African swine fever in West Africa and Madagascar. In: Proceedings of the 12th International Conference of the Association of Institutions of Tropical Veterinary Medicine, Montpellier, France, Camus E, Cardinale E, Dalibard C, Martinez D, Renard JF, Roger F (editors), pp 8–22
Kingdon J (2003) The Kingdon Field Guide to African Mammals. London: A&C Blackwell Publishers
Kleiboeker SB, Scoles GA (2001) Pathogenesis of African swine fever virus in Ornithodoros ticks. Animal Health Research Reviews 2:121–128
Laddomada A, Patta C, Oggiano A, Caccia A, Ruiu A, Cossu P, et al. (1994) Epidemiology of classical swine fever in Sardinia: a serological survey of wild boar and comparison with African swine fever. Veterinary Record 134:183–187
Louza AC, Boinas FS, Caiado JM, Vogario JD, Hess WR (1989) Rôle des vecteurs et des réservoirs animaux dans la persistence de la Peste porcine africaine au Portugal. Epidémiologie et Santé Animale 15:89–102
Lubisi BA, Bastos ADS, Dwarka RM, Vosloo W (2005) Molecular epidemiology of African swine fever in East Africa. Archives of Virology 150:2439–2452
Luther NJ, Majiyagbe KA, Shamaki D, Lombin LH, Antiagbong JF, Bitrus Y, et al. (2007) Detection of African swine fever virus genomic DNA in a Nigerian Red River hog (Potamochoerus porcus). Veterinary Record 160:58–59
Mannelli A, Sotgia S, Patta C, Oggiano A, Carboni A, Cossu P, Laddomada A (1998) Temporal and spatial patterns of African swine fever in Sardinia.Preventive Veterinary Medicine 35:297–306
Mansveld PR (1963) The incidence and control of African swine fever in the Republic of South Africa. Bulletin de l’Office International des Epizooties 60:889–894
Mauget R (1991) Reproductive biology of the wild Suidae. In: Biology of Suidae, Barret RH, Spitz F (editors), Briançon, France: IRGM, pp 49–64
Mayer JM, Brisbin IL (1997) Distinguishing feral hogs from introduced wild boar and their hybrids: a review of past and present efforts. Proceedings of the Feral Pig Symposium, Orlando, FL. Available: http://texnat.tamu.edu/symposia/feral/feral-7.htm [accessed February 1, 2009]
McVicar JW, Mebus CA, Becker HN, Belden RC, Gibbs EP (1981) Induced African swine fever in feral pigs. Journal of the American Veterinary Medical Association 179:441–446
Montgomery RE (1921) On a form of swine fever occurring in British East Africa (Kenya Colony). Journal of Comparative Pathology 34:243–262
Oliver WLB, Brisbin L, Takahashi S (1993) The Eurasian wild pig. In: Pigs, Peccaries and Hippos Status Survey and Action Plan, Oliver WLB (editor), Gland, Switzerland: IUCN, pp 107–191
Oura CA, Powell PP, Anderson E, Parkhouse RM (1998) The pathogenesis of African swine fever in the resistant bushpig. Journal of General Virology 79:1439–1443
Penrith ML, Thomson GR, Bastos ADS (2004a) African swine fever. In: Infectious Diseases of Livestock with Special Reference to Southern Africa, Coetzer JAW, Tustin RC (editors), Cape Town, South Africa: Oxford University Press, pp 1088–1119
Penrith ML, Thomson GR, Bastos AD, Phiri OC, Lubisi BA, Du Plessis EC, et al. (2004b) An investigation into natural resistance to African swine fever in domestic pigs from an endemic area in southern Africa. Revue Scientifique et Technique 23:965–977
Penrith ML, Lopes Pereira C, Lopes da Silva MM, Quembo C, Nhamusso A, Banze J (2007) African swine fever in Mozambique: review, risk factors and considerations for control. Onderstepoort Journal of Veterinary Research 74:149–160
Perez J, Fernandez AI, Sierra MA, Herraez P, de las Mulas JM (1998) Serological and immunohistochemical study of African swine fever in wild boar in Spain. Veterinary Record 143:136–139
Perez-Filgueira DM, Gonzalez-Camacho F, Gallardo C, Resino-Talavan P, Blanco E, Gomez-Casado E, et al. (2006) Optimization and validation of recombinant serological tests for African swine fever diagnosis based on detection of the p30 protein produced in Trichoplusia ni larvae. Journal of Clinical Microbiology 44:3114–3121
Pierce MA (1974) Distribution and ecology of Ornithodoros moubata porcinus Walton (Acarina) in animal burrows. Bulletin of Entomological Research 64:605–609
Pini A, Hurter LR (1975) African swine fever: an epizootiological review with special reference to the South African situation. Journal of South African Veterinary Medical Association 46:227–232.
Plowright W (1977) Vector transmission of African swine fever virus. In: Commission of the European Communities Seminar on Hog Cholera/Classical Swine Fever and African Swine Fever. Report EUR 5903 EN, pp 575–587
Plowright W (1981) African swine fever. In: Infectious Diseases of Wild Mammals, Davis JW, Karstad LH, Trainer DO (editors), Ames, IA: Iowa State University Press, pp 178–190
Plowright W, Parker J, Pierce MA (1969) African swine fever virus in ticks (Ornithodoros moubata, Murray) from Tanzania. Nature 221:1071–1073
Plowright W, Perry CT, Pierce MA, Parker J (1970) Experimental infection of the argasid tick, Ornithodoros moubata porcinus, with African swine fever virus. Archiv für die gesamte Virusforschung 31:33–50
Plowright W, Thomson GR, Neser JA (1994) African swine fever. In: Infectious Diseases of Livestock with Special Reference to Southern Africa, Coetzer JAW, Thomson GR, Tustin RC (editors), Cape Town, South Africa: Oxford University Press, pp 567–599
Roger F, Ratovonjato J, Vola P, Uilenber G (2001) Ornithodoros porcinus ticks, bushpigs, and African swine fever in Madagascar. Experimental and Applied Acarology 25:263–269
Rowlands RJ, Michaud V, Heath L, Hutchings G, Oura C, Vosloo W, et al. (2008) African swine fever virus isolate, Georgia, 2007. Emerging Infectious Diseases 14:1870–1874
Seydack AHW (1990) The ecology of the bushpig (Potamochoerus porcus Linn. 1758) in the Cape Province, South Africa. PhD thesis, University of Stellenbosch, Stellenbosch, South Africa
Siméon-Negrin RE, Frias-Lepoureau MT (2002) Eradication of African swine fever in Cuba (1971 and 1980). In: Trends in Emerging Viral Infections of Swine, Morilla A, Yoon KJ, Zimmermann JF (editors), Iowa State University Press, pp 125–131
Taylor WP, Best JR, Colquhoun IR (1977) Absence of African swine fever from Nigerian warthogs. Bulletin of Animal Health Production in Africa 25:196–203
Thomson GR (1985) The epidemiology of African swine fever: the role of free-living hosts in Africa. Onderstepoort Journal of Veterinary Research 52:201–209
Thomson GR, Gainaru MD, Van Dellen AF (1980) Experimental infection of warthog (Phacochoerus aethiopicus) with African swine fever virus. Onderstepoort Journal of Veterinary Research 46:149–154
Thomson G, Gainaru MD, Lewis A, Biggs H, Nevill E, van der Pypekamp H, et al. (1983) The relationship between African swine fever virus, the warthog and Ornithodoros species in southern Africa. In: African Swine Fever, Wilkinson PJ (editor), Commission of the European Communities. Report EUR 2466 EN, pp 85–100
Tulman ER, Delhon GA, Ku BK, Rock DL (2009) African swine fever virus. Current Topics in Microbiology and Immunology 328:43–87
Vercammen P, Seydack AHW, Oliver WLB (1993) The bush pigs (Potamochoerus porcus and P. larvatus. In: Pigs, Peccaries and Hippos Status Survey and Action Plan, Oliver WLB (editor), Gland, Switzerland: IUCN
Vial L, Diatta G, Tall A, Ba el H, Bouganali H, Durand P, et al. (2006) Incidence of tick-borne relapsing fever in West Africa: longitudinal study. Lancet 368(9529):37–43
Vial L, Wieland B, Jori F, Etter E, Dixon L, Roger F (2007) African swine fever virus DNA in soft ticks, Senegal. Emerging Infectious Diseases 13:1928–1931
Viñuela E (1985) African swine fever virus. Current Topics in Microbiology and Immunology 116:151–170
Walton GA (1962) The Ornithodorus moubata superspecies problem in relation to human relapsing fever epidemiology. Symposia of the Zoological Society of London 6:83–156
Walton GA (1979) A taxonomic review of the Ornithodoros moubata (Murray) 1877 (Sensu Walton, 1962) species group in Africa. Recent Advances in Acarology 2:491–500
White LJT (1994) Biomass of rain forest mammals in the Lopé Reserve, Gabon. The Journal of Animal Ecology 63:499–512
Wilkinson PJ (1984) The persistence of African swine fever in Africa and the Mediterranean. Preventive Veterinary Medicine 2:71–82
Wilkinson PJ (1988) The distribution of African swine fever virus isolated from Ornithodoros moubata in Zambia. Epidemiology and Infection 101:547–564
Wilkinson PJ (1989) African swine fever virus. In: Virus Infections of Vetebrates, Vol. 2: Virus Infections of Porcines, Penjaert MB (editor), Amsterdam: Elsevier, pp 17–35
Acknowledgments
This review was initiated within the framework of a project funded by the European Food Safety Agency (CFP/EFSA/AHAW/2007/02) in order to review the literature of African swine fever. We are grateful to Dr. William Oliver, Chair of the IUCN Pigs, Peccaries, and Hippos Specialist Group, for allowing us to use IUCN maps as a template for those prepared for this review. We are grateful to the Wellcome Trust Foundation for funding some of the results reported in this article in Senegal, Democratic Republic of Congo, and Madagascar.
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Jori, F., Bastos, A.D.S. Role of Wild Suids in the Epidemiology of African Swine Fever. EcoHealth 6, 296–310 (2009). https://doi.org/10.1007/s10393-009-0248-7
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DOI: https://doi.org/10.1007/s10393-009-0248-7