The World Health Organization (WHO) has issued a warning about the rise in the number of Ebola cases in Guinea and Sierra Leone in the past weeks.
In the week ending on June 7, 16 new cases of the disease were found in Guinea and 15 in neighboring Sierra Leone.
In Guinea, 13 other cases had been found the previous week and nine cases the week before that.
WHO officials say the numbers indicate a clear rise in the disease cases.
In Sierra Leone, the trend was likewise with 12 new cases found during the last week of May, and three in the previous week.
"This is the second consecutive weekly increase in case incidence," the WHO warned.
In its latest Ebola report, the WHO said the disease outbreak has killed 11,158 of the 27,237 people infected in West Africa.
507 health workers have died since the epidemic broke out in West Africa in December 2013 affecting Sierra Leone, Guinea and Liberia.
Liberia was declared Ebola-free in May, but hopes that Sierra Leone and Guinea would quickly follow suit have been dashed in recent weeks.
The organization has previously warned in May that the Ebola crisis is not yet over and medicine experts must still develop a clinically-tested and universally accepted vaccine or pill that could effectively fight the deadly virus.
XLS/NN/GHN