Epidemiology of herpes simplex virus types 2 and 1 amongst men who have sex with men attending sexual health clinics in England and Wales: implications for HIV prevention and management Hill, C and McKinney, E and Lowndes, C M and Munro, H and Murphy, G and Parry, J V and Gill, O N and the GUM Anon Network, Collective, Eurosurveillance, 14, 19418 (2009), https://doi.org/10.2807/ese.14.47.19418-en