The number of categorized states jumped from just 12 the week before.
McGeer says winter viral illnesses are divided into two categories, influenza and "everything else", which includes "the sniffles".
Patients in the central San Joaquin Valley have tested positive for influenza A and B. Influenza A is the more common strain, but the Valley is seeing more of influenza B than in other regions of the country, Bergen said. "Last year, we had a flu season that peaked in the first week of January so there was a lot of disease over Christmas".
Experts say it's still going to get worse.
The CDC advises everyone older than six months of age get the flu shot if they aren't allergic. Many health plans cover the cost of the vaccine with no copay.
Can I still get a flu shot?
The flu doesn't discriminate as to who it will infect, which is why it's important to make sure your workforce is prepared for flu season - which is now in full force.
There's no better time than now to start preparing for flu season. It takes about two weeks for the body to create the antibodies for the virus, so those getting the vaccine should plan to do so as early as possible. The effectiveness of the vaccine varies each season as the strain of the virus adapts and adjusts to its environment, but generally the vaccine is about 40 to 60 percent effective in protecting the population from the flu.
Sometimes different strains of the flu virus begin spreading simultaneously.
Fact: Simply put, a flu shot is the best protection you can get.
Flu shots are available on the ground floor of Hamilton Health Centre between 8.30am and 11.30am and on Wednesdays only between 2pm and 4pm. A recent report published in the open access publishing platform F1000Research, however, indicates that the flu vaccine may end up being more effective for the Northern Hemisphere's 2017-2018 flu season than it was in Australia, where the vaccine's effectiveness was only 10% for the season.
The virus can live on surfaces for a long time - Use the wipes provided at grocery stores to clean your cart before shopping, and wash your hands frequently.
The good news is that it is not too late to get the vaccination.