A health care worker in the US who looked after an Ebola patient who later died has now tested positive in a preliminary test.<br /><br /> That announcement from Texas health officials, who say further testing is needed to confirm the diagnosis.<br /><br /> They say the worker had looked after Liberian man Thomas Duncan, who became the US’s first Ebola fatality.<br /><br /> The worker reported a slight fever on Friday night and was isolated and referred for testing.<br /><br /> Health officials say they were prepared for the possibility of another case and possible contacts with the new patient are now being traced.<br /><br /> This as JFK airport in New York began stepping up the screening of travellers, with the US vowing to do more to prevent an Ebola outbreak.<br /><br /> “It is worth it,” said a Nigerian man at JFK. “Whatever you can do to prevent something drastic is worth it. Any inconvenience we go through, it will be worth it, for safety.”<br /><br /> A man returning from Cambodia said: “I don’t see why there would be any issues at all with that
