According to the Centers for Disease Control and Prevention (CDC), the number of influenza cases rose during the last week of December 2013 across the country, with 26.7% of tested cases coming back positive for influenza. Arizona was only one of three states with local influenza activity. By Dec. 28, nearly 600 people in Arizona had been confirmed to have influenza, with 167 cases being reported in the last week of December alone, according to the Arizona Department of Health Services (AZDHS). The only counties without any reported flu activity within the previous three weeks were Gila and La Paz.
AZDHS reported there are two main types of influenza, categorized as Type A and Type B, that have been found to cause sickness among humans, with Type A being further broken down into A (H1) and A (H3). According to AZDHS, 79% of all cases reported during the 2013-14 flu season, as of the last week in December, were caused by Type A, while Type B only caused 18%. The remaining cases were caused by unknown types.
The flu season often does not peak until end of January, so employers may want to prepare for more workers taking sick days to get well.