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Sierra Leone

Sierra Leone Weekly Ebola Surveillance Report, 23rd January 2015

Attachments

Country Overview (up to 18th January)

Number of Cases

After a downwards trend during week 47 and 48 the overall number of Ebola cases in Sierra Leone stabilised until week 52. The slight increase in weeks 49 and 50 is likely due to the uptake of active surveillance in the Western area. From week 53 the VHF data is less reliable as weeks 1 to 2 are incomplete due to ongoing data entry in the districts (Fig. 1).

The weekly reports generated from the district line lists during this period may be more reliable for confirmed cases as they are calculated based on laboratory results. Information from this data source confirmed a downward trend in confirmed cases in the time period that correlates to week 53 in the VHF reporting. The decrease is from 337 confirmed cases reported between 22 to 28 December; 185 reported between 29 December to 4 January; 184 reported between 5 to 11 January; 120 between the 12 to 18 January; and 49 cases between the 19 to 23 January (note this is 5 days of data). The highest number of cases continue to be reported from Western Area and Port Loko and this is the same for the VHF data and the laboratory reports (Fig. 2).