1. Wong, DC, et al. Epidemic and endemic hepatitis in India: evidence for a non-A, non-B hepatitis virus aetiology. Lancet 1980; 2: 876–879.
2. Emerson, SU, Purcell, RH. Hepatitis E virus. Reviews in Medical Virology 2003; 13: 145–154.
3. Kumar, A, et al. Hepatitis E in pregnancy. International Journal of Gynaecology and Obstetrics 2004; 85: 240–244.
4. Worm, HC, Van der Poel, WH, Brandstatter, G. Hepatitis E: an overview. Microbes and Infection 2002; 4: 657–666.
5. Tei, S, et al. Zoonotic transmission of hepatitis E virus from deer to human beings. Lancet 2003; 362: 371–373.
6. Yazaki, Y, et al. Sporadic acute or fulminant hepatitis E in Hokkaido, Japan, may be food-borne, as suggested by the presence of hepatitis E virus in pig liver as food. Journal of General Virology 2003; 84: 2351–2357.
7. Takahashi, K, et al. Complete or near-complete nucleotide sequences of hepatitis E virus genome recovered from a wild boar, a deer, and four patients who ate the deer. Virology 2004; 330: 501–505.
8. Zanetti, AR, et al. Identification of a novel variant of hepatitis E virus in Italy. Journal of Medical Virology 1999; 57: 356–360.
9. Widdowson, MA, et al. Cluster of cases of acute hepatitis associated with hepatitis E virus infection acquired in the Netherlands. Clinical Infectious Diseases 2003; 36: 29–33.
10. Buti, M, et al. Sporadic cases of acute autochthonous hepatitis E in Spain. Journal of Hepatology 2004; 41: 126–131.
11. Mansuy, JM, et al. Hepatitis E in the south west of France in individuals who have never visited an endemic area. Journal of Medical Virology 2004; 74: 419–424.
12. Meng, XJ, et al. A novel virus in swine is closely related to the human hepatitis E virus. Proceedings of the National Academy of Sciences USA 1997; 94: 9860–9865.
13. Meng, XJ, et al. Genetic and experimental evidence for cross-species infection by swine hepatitis E virus. Journal of Virology 1998; 72: 9714–9721.
14. Hsieh, SY, et al. Identity of a novel swine hepatitis E virus in Taiwan forming a monophyletic group with Taiwan isolates of human hepatitis E virus. Journal of Clinical Microbiology 1999; 37: 3828–3834.
15. Drobeniuc, J, et al. Hepatitis E virus antibody prevalence among persons who work with swine. Journal of Infectious Diseases 2001; 184: 1594–1597.
16. Meng, XJ, et al. Prevalence of antibodies to hepatitis E virus in veterinarians working with swine and in normal blood donors in the United States and other countries. Journal of Clinical Microbiology 2002; 40: 117–122.
17. Withers, MR, et al. Antibody levels to hepatitis E virus in North Carolina swine workers, non-swine workers, swine, and murids. American Journal of Tropical Medicine and Hygiene 2002; 66: 384–388.
18. Ghabrah, TM, et al. Comparison of tests for antibody to hepatitis E virus. Journal of Medical Virology 1998; 55: 134–137.
19. Mast, EE, et al. Evaluation of assays for antibody to hepatitis E virus by a serum panel. Hepatitis E Virus Antibody Serum Panel Evaluation Group. Hepatology 1998; 27: 857–861.
20. Enoe, C, Georgiadis, MP, Johnson, WO. Estimation of sensitivity and specificity of diagnostic tests and disease prevalence when the true disease state is unknown. Preventive Veterinary Medicine 2000; 45: 61–81.
21. Hui, SL, Walter, SD. Estimating the error rates of diagnostic tests. Biometrics 1980; 36: 167–171.
22. Joseph, L, Gyorkos, TW, Coupal, L. Bayesian estimation of disease prevalence and the parameters of diagnostic tests in the absence of a gold standard. American Journal of Epidemiology 1995; 141: 263–272.
23. Widdowson, MA, et al. Detection of serum antibodies to bovine norovirus in veterinarians and the general population in the Netherlands. Journal of Medical Virology 2005; 76: 119–128.
24. Thrusfield, M. Veterinary Epidemiology, 2nd edn. Oxford: Blackwell Science, 1995, pp. 483.
25. Engel, B, et al. Estimation of sensitivity and specificity of three conditionally dependent diagnostic tests in the absence of a gold standard. Journal of Agricultural, Biological, and Environmental Statistics 2006; 11: 360–380.
27. Olsen, B, et al. Unexpected high prevalence of IgG-antibodies to hepatitis E virus in Swedish pig farmers and controls. Scandinavian Journal of Infectious Diseases 2006; 38: 55–58.
28. Rutjes, SA, et al. Increased hepatitis E virus prevalence on Dutch pig farms from 33 to 55% by using appropriate internal quality controls for RT-PCR. Journal of Virological Methods. Published online: 23 February 2007. doi: 10.1016/j.jviromet.2007.1001.1.030.
29. Mathur, P, et al. Sero-epidemiology of hepatitis E virus (HEV) in urban and rural children of North India. Indian Pediatrics 2001; 38: 461–475.
30. Zaaijer, HL, et al. Hepatitis E in The Netherlands: imported and endemic. Lancet 1993; 341: 826.
31. Herremans, M, et al. Swine-like hepatitis E viruses are a cause of unexplained hepatitis in the Netherlands. Journal of Viral Hepatitis 2007; 14: 140–146.
32. Roitt, IM, Brostoff, J, Male, DK. Immunology, 4th edn. London: Mosby, 1995, pp. 416.