The effective reproduction number, R t , of Ebola virus disease was estimated using country-specific data reported from Guinea, Liberia and Sierra Leone to the World Health Organization from March to August, 2014. R t for the three countries lies consistently above 1.0 since June 2014. Country-specific R t for Liberia and Sierra Leone have lied between 1.0 and 2.0. R t <2 indicate that control could be attained by preventing over half of the secondary transmissions per primary case.
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Nishiura et al. (2014) studied this question.
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