The US dollar edged lower on Wednesday and the Japanese yen and the Swiss franc slipped amid muted demand for safe haven units as updates from China about the spread of a new flu-like coronavirus raised hopes the outbreak would be contained.

The dollar index, which measures the greenback against six other major currencies, was down 0.03% at 97.506.

Deaths from China's new flu-like virus rose to nine on Wednesday, with more than 470 confirmed cases, heightening global fears of contagion from an infection suspected to have come from animals.

But China's response and candor - in contrast to how it handled the 2002-03 Severe Acute Respiratory Syndrome (SARS) epidemic - helped reassure investors concerned about the possible global fallout.

"The virus concern is settling down a bit overnight as the market is getting a little more transparency around the issue from China and other nations than they did with SARS for example," Brad Bechtel, managing director, Jefferies in New York, said in a note.

Against the safe-haven yen and the Swiss franc, which tend to draw investors during times of geopolitical or financial stress, the dollar was moderately stronger on the day.

The dollar was 0.04% higher against the Japanese currency, and up 0.08% against the franc.

The Canadian dollar was down 0.4% against the greenback after the Bank of Canada maintained its key overnight interest rate at 1.75% as expected on Wednesday, but opened the door to a possible cut should a slowdown in growth drag on.