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This year's flu vaccine was just 25 percent effective against H3N2, according to the CDC.

The most common strain of flu now affecting people in Arizona, known as H3N2, is linked to a strain kids were exposed to in 1968, according to Michael Worobey, the head of the ecology and evolutionary biology department at the UA.

The most recent statewide data show intensive care unit admissions and outpatient visits for influenza have decreased, according to an Illinois Department of Public Health report.

Despite the declines in the CDC's latest data and reports that this year's vaccine is only about 36 percent effective in preventing the flu, US health officials are still urging people to get one. It can also reduce your contagiousness to others, so if you live with somebody who would really get sick with the flu, get vaccinated. Although adapting circulating virus strains for manufacture can lead to differences between the circulating strain and the one used for manufacturing that could affect effectiveness, so far the data we have suggests that the viruses provided by reference laboratories to manufacturers to make this year's vaccines do reasonably match the circulating flu strains that are causing most of the illnesses, including H3N2.

Next: Too many strains to cover in one vaccine. By comparison it is 42 percent effective against influenza Type B viruses in Europe. The estimates of overall flu vaccine effectiveness for children are higher with an estimated 59 percent effectiveness against all types of Influenza in children 6 months to 8 years of age. It's resulted in 97 pediatric deaths and a record number of hospitalizations.

So why did this season's vaccines not deliver higher protection against H3N2?

By comparison, at this time previous year, TRMC was sitting at approximately 150 confirmed cases.

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Clean the sick room and the bathroom once a day with household disinfectant.

Dr. Ashley Peko, assistant medical director of the emergency department at Parker Adventist Hospital, said getting a flu shot is still an important option for those who haven't already. "Proportionately it's been those without a vaccine, but those who have received the vaccine are also at risk", said Peko.

Most adults start to be contagious with the flu about one day before their symptoms start and remain contagious for 5 to 7 days after, according to the CDC.

Peko said recognizing true flu symptoms is vital in combating the spread of influenza. "It's highly contagious, and anyone with the flu should wait until at least 24 hours without a fever, without using ibuprofen or Tylenol, before returning to work or school".

In some cases, you get sick, but not with the flu.

Despite a possible nationwide peak in the reported cases, the next few months of the flu season are still unsafe.

"The knowledge we gain through such scientific research will allow us to determine if we need to change recommendations to vaccine manufacturers for how future seasons' vaccines should be produced", Gottlieb said.