Others at high risk of getting the flu are children under age 5, pregnant women and those with underlying conditions such as lung or heart disease.
The number of flu cases normally peaks here and elsewhere between January and February.
A map showing flu hotspots, including the potentially Aussie flu strain which has arrived in the United Kingdom, has shown Sunderland and Durham are among the areas with the highest cases reported. About 2,500 laboratory-confirmed cases were reported the week of Christmas, bringing the number by the end of 2017 to almost 8,000, according to an Arizona Department of Health Services report.
Decades after approval in various countries, the UK National Health Service (NHS) has approved the adjuvanted flu vaccine Fluad. One was in Maricopa County, according to the report.
The last week in December saw 220 confirmed cases of influenza A across the commonwealth - a 44 percent increase - bringing the flu season total to 502, according to the state Department of Public Health.
"It's just one of those years where the CDC is seeing that this strain of flu is only somewhat covered by the vaccine", Jennifer Radtke, manager for infection prevention at the University of Tennessee Medical Center in Knoxville, told USA Today.
"The antibodies you make in response to vaccine with one type of flu virus can oftentimes provide protection against different but related flu viruses", she said.More news: Liverpool's Mohamed Salah wins incredible individual award
"In Florida, we're seeing more activity across all age groups this year than we've seen in the last two flu seasons".
"Now is still a good time to get a flu shot". It's never too late for people to get their flu shot since flu season typically lasts from October to April.
In all, the CDC says that anywhere between 12,000 to 56,000 people have died from the illness annually since 2010 with another 140,000 to 710,000 hospitalizations.
This includes washing hands regularly, using tissues to cover your mouth while coughing and cleaning surfaces to get rid of germs.
Some of the cases have been severe where the patients required treatment in the intensive care unit, Saunders said.
If sick, Perreault, DeMaria and the federal Centers for Disease Control urge people to stay home from work, social functions and other gathering places to avoid spreading the flu, common cold and other viral illnesses.
Contact Mikayla Mace at 573-4158 and Stephanie Innes at 573-4134.