Absence of evidence is not evidence of absence. Welcome to the end of the third week.

Three weeks since the WHO was notified of the newly emerged avian influenza A(H7N9) virus.

Today the case tally sits at 97 confirmation including 18 deaths, an asymptomatic case, three family clusters, no proven or sustained human-to-human transmission, no clear host in poultry or wild birds or pigs (all things that history or H7N9 genetic sequences indicate should be hosting infection).