Public Health Agency of Canada recommendations on travel to Mexico and southern U. S.
Only a warning has been issued.
"If traveling to affected areas, do the same things that you would normally do to protect yourself and others during normal flu season. Wash your hands, cover coughs and sneezes, stay in if you are sick and get an annual influenza immunization (flu shot).
"Even though the annual flu shot may not protect against the human swine influenza, there is still seasonal influenza circulating in Mexico and the flu shot will help protect you from contracting the seasonal human flu."

The agency has posted answers to 25 frequently asked questions about human swine influenza:
human swine flu