Yes indeed the kids from Queens were in Mexico:
http://www.freerepublic.com/focus/f-news/2237386/posts
18 cases in Canada?
“WHO further said Canadian labs had confirmed 18 cases as swine flu, 12 of which were genetically identical to ones in the United States.”
http://blogs.sciencemag.org/scienceinsider/2009/04/dizzying-deluge.html