"About 20% of tests for influenza came back as positive in California for the week of Dec. 29 to Jan. 4, according to the California Department of Public Health. That's down 1.9% from the previous week."
"Influenza season typically peaks somewhere between December and February, according to Dr. Dean Blumberg, chief of UC Davis Health's Division of Pediatric Infectious Diseases."
"The flu is highly contagious, with disease spread mainly by droplets made when people with flu cough, sneeze, or talk."
"There are four different strains of influenza viruses: A, B, C and D. Only one flu strain - influenza A - is known to cause global epidemics of disease."
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