Hepatitis E virus in blood components: a prevalence and transmission study in southeast England by Patricia Hewitt, Samreen Ijaz, Su Brailsford, Rachel Brett, Steven Dicks, Becky Haywood, Iain Kennedy, Alan Kitchen, Poorvi Patel, John Poh, Katherine Russel, Kate Tettmar, Joanne Tossell, Ines Ushiro-Lumb, and Richard Tedder