“Americans are battling a severe bout of flu that has arrived earlier than expected, leaving many pharmacy shelves and clinics lacking flu vaccines.
The Centers for Disease Control each year monitor flu strains around the world to determine which will circulate in the United States. This year’s vaccine targets three strains: two strains of Influenza A (H1N1 and H3N2), one of Influenza B, according to the CDC.”
Source:Flu seems curiously cagey this season | The Tennessean | tennessean.com
