Recent increase in S. Paratyphi A phage type 1 and S. Typhi Vi-phage type E1 in England and Wales, associated with travel to the Indian subcontinent
Lewis, H. C. and Lawrence, J, Weekly releases (1997–2007), 11, 2921 (2006), https://doi.org/10.2807/esw.11.10.02921-en