Ebola concentrations in West Africa.
The map comes from the December 10 WHO Situation Update. Also from this report is a very troublesome finding, highlighted below.
Effective contact tracing ensures that the reported and registered contacts of confirmed EVD cases are visited daily to monitor the onset of symptoms during the 21-day incubation period of the Ebola virus. Contacts presenting symptoms should be promptly isolated, tested for EVD, and if necessary treated, to prevent further disease transmission.
During the week of 1 December, 95% of all registered contacts were visited on a daily basis in Guinea, 96% in Liberia, and 84% in Sierra Leone (a steady decline since week 44, during which 94% of registered contacts were reached). However, the proportion of contacts reached was lower in many districts. Each district is reported to have at least one contact-tracing team in place.
On average, 17 contacts were listed per new case in Guinea during the week to 1 December, 22 in Liberia, and 6 in Sierra Leone.