Changing to a weekly view on this as it appears all of North America is in sustained community transmission mode. If this follows typical seasonal patterns it should start to trail off soon...otherwise, the peak new cases in the USA should occur around the end of June if the start was in the beginning of March (based on R0 of 1.6 and a world of other assumptions)
Hence the weekly view - here's hoping all the scoffers are correct - for this wave and in the Fall.
Image updated for Canada 06 May 2009 number (PHAC)
Adding link to unedited transcript of CDC presser today: http://tickerforum.org/cgi-ticker/akcs-www?post=94020
Adding link: WHO updated guidance on pandemic preparedness and response http://www.who.int/csr/disease/influenza/PIPGuidance09.pdf