Sue Carroll, head of the microbiology section in the laboratory at Advocate BroMenn Regional Medical Center, drops a sample of patient fluids into a test tube before assessing the presence of flu virus. Seasonal flu is making an earlier appearance this year, and the most dominant strain seen in lab results is one that causes more severe illness.
Sue Carroll, head of the microbiology section in the laboratory at Advocate BroMenn Regional Medical Center, drops a sample of patient fluids into a test tube before assessing the presence of flu virus. Seasonal flu is making an earlier appearance this year, and the most dominant strain seen in lab results is one that causes more severe illness. David Proeber File photo
Sue Carroll, head of the microbiology section in the laboratory at Advocate BroMenn Regional Medical Center, drops a sample of patient fluids into a test tube before assessing the presence of flu virus. Seasonal flu is making an earlier appearance this year, and the most dominant strain seen in lab results is one that causes more severe illness. David Proeber File photo

Flu hits epidemic threshold

December 31, 2014 10:57 PM