The flu season hasn't kicked in yet, but infectious disease experts are on the alert for new strains of the virus, including another swine flu that's popped up in parts of the United States and a drug-resistant flu circulating in the Southern Hemisphere.
Since the 2009 swine flu pandemic, public health and infectious disease experts have upped their surveillance of new flu strains, and they're paying close attention to what's happening worldwide in hopes of being better prepared for the type of flu season that will hit here.






