Author on West Africa Tim Butcher has written a sobering piece on the spread of Ebola for the Telegraph.
"Never before has Ebola spread through a significant urban population yet this is what is happening in Freetown, capital of Sierra Leone; Monrovia, capital of Liberia and Conakry, capital of Guinea."
"The most worrying aspect is the longer the virus continues spreading in these communities, the greater the likelihood of a mutation that will create an even more pathogenic virus, one that might even be transferred through the air. This is not the stuff of a fiction writers, this is the sort of thing currently being talked about by virologists. "
Tim spoke to John Maytham earlier.