Dallas mayor: I want to deal with facts not fear

A second health worker in the US state of Texas has tested positive for Ebola, health officials say.

Both health workers treated Liberian man Thomas Duncan, who died last week after becoming the first person diagnosed with Ebola in the US.

Dallas Mayor Mike Rawlings admitted that anxiety had increased but said "we are not fearful."

He said he wanted to "minimise rumours and maximise facts".