Model-based evaluation of the impact of prophylactic vaccination applied to Ebola epidemics in Sierra Leone and Democratic Republic of Congo.

eekly cases, during which a ring vaccination program was initiated on August 8, 2018 [ 31 ]; (ii) Days 120 to 217, during which 30 to 50 cases of EVD were reported weekly during a downturn in the vaccination drive, as indicated by the reduction in daily vaccination rate; (iii) Days 218 to 273, when an increasing trend in weekly EVD cases was witnessed amidst a revival of the vaccination drive, as demonstrated by an increase in the rate of vaccination; (iv) Days 274 to 385, when weekly cases began to decline as the vaccination rate reached its peak (> 1200 vaccinations daily); and (v) Days 386 to 546, a period characterized by a sharp decline in weekly cases (Fig. 3 ).

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