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b'PHILADELPHIA\\u2014Vaccinating populations after an outbreak of cholera has already begun could be a powerful way of controlling the growth of an epidemic according to scientists reporting to the American Society of Tropical Medicine and Hygiene here. London School of Hygiene & Tropical Medicine MSc graduate Rita Reyburn \\u2014 who\\u2019s been researching epidemics in Zimbabwe, Zanzibar and Calcutta with the International Vaccine Institute of Korea and working with Lorenz von Seidlein from the Menzies School of Health Research, Casuarina, Australia \\u2014 told Peter Goodwin about their calculations which have validated the later use of vaccination to protect those who haven\\u2019t already been infected.'