Nita Bharti, associate professor of biology at Penn State, studies Ebola and says the death toll is probably much higher than we currently believe because it took longer to identify the outbreak and that allowed it to spread faster.

The Ebola outbreak in the Democratic Republic of Congo (DR Congo) has claimed at least 87 lives.

The virus behind the latest Ebola outbreak is the Bundibugyo virus, which is less common and there is no vaccine or treatment.

And how public health workers are trying to contain it