PARIS: One in almost 3,000 blood donors in England carry the hepatitis E virus (HEV) which can cause liver disease, said a study on Monday that sparked a call for screening in Europe. Published on World Hepatitis Day, a study in The Lancet medical journal said a systematic analysis of donated blood showed that 79 out of 225,000 donations were infected with a version of the virus, genotype 3, most prevalent in developed countries. Humans can contract it from infected pigs and contaminated blood or drinking water. Transmission of the virus had occurred in 18 of 43 exposed blood recipients, the authors said. One developed mild clinical hepatitis.