The US CDC starts more gears turning.

US CDC asked local healthcare providers to keep an eye out for "signs of H7N9 flu". 

Rather than watch for feathers, this will entail being on the lookout for cases with influenza-like illness (ILI) among those who have themselves, or are in contact with someone who, recently traveled China who are influenzavirus-negative by standard laboratory testing methods. Rapid prescription of Tamiflu is recommended (within 48h). 

All commercially available influenzavirus tests on these cases should be disregarded because their ability to detect the new H7N9 is untested so the risk of false negatives is high.