Scientists used model to estimate number of Ebola - infected travelers leaving West Africa . But even exit screening , he says , is unlikely to have much effect because of the virus ' long incubation period . Up to 100 people with the deadly virus might travel internationally each month . Majority of people going out of affected countries are going to low- or middle - income nations .
Scientists used model to estimate number of Ebola - infected travelers leaving West Africa . Up to 100 people with the deadly virus might travel internationally each month . Majority of people going out of affected countries are going to low- or middle - income nations .