US CDC director Dr Thomas Frieden at hearing on health officials' response to Ebola outbreak
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US health officials quizzed on Ebola response

American health officials have faced some tough questioning after a nurse in Texas was allowed to travel after treating an Ebola victim who later died.

President Obama says he will consider appointing a so-called Ebola 'Czar' to coordinate the US response.

Alistair Leithead reports.

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