This does not mean that it kept 36 percent of the people who got it from getting sick at all.
The vaccine provided good protection - 67 percent effective - against another common kind of flu virus, Type A H1N1, which has not been seen much this winter. The numbers were worse for H3N2.
"There may be spot shortages of certain types of flu vaccine", said Root, who encouraged everyone over the age of six months to get a flu shot.
If you do get sick with flu symptoms, in most cases, you should stay home and avoid contact with other people except to get medical care. Children may also have nausea, vomiting and diarrhea.
Health officials on Friday said about 1 of every 13 visits to the doctor last week was for fever, cough and other symptoms of the flu.
She said the doses of vaccine she still had on hand don't expire until May 31.
Nearly 70 percent of flu this year has been cause by the influenza A H3N2 strain, and that's where the vaccine was weakest, with estimated effectiveness of only 25 percent.
And, as Schuchat noted, the vaccine was 51 percent effective against this strain in young children. Everybody else got no statistically significant benefit.
The CDC also reported 10 more influenza-associated pediatric deaths, 7 of which were associated with influenza A viruses and 3 of which were associated with influenza B viruses. The illness tracker gave Warrenton a 4.5 out of 10 ranking in level of severity for influenza, and Manassas a 5. Typically the very old, very young, and immuno-compromised are hit hardest by the flu.
"We're urging everybody who hasn't been vaccinated, to rush out and get vaccinated", he said.
And that has many people asking, "Why is it so deadly?"
Markey's idea is to provide $200 million to the National Institutes of Health from fiscal 2019 through fiscal 2023 and give the agency the assignment to "conduct or support comprehensive research for the creation of a universal influenza vaccine that could be administered once or twice and provide a lifetime of protection", the senator's office said. Flu strains mutate every year. Each year, they're prepared for when flu season rolls around. Canadian researchers estimated a 17% effectiveness rate.
Flu seasons span from the 40th week of one year to the 39th week of the following year. Officials say the this bad flu season will likely continue.
Of those who did have influenza, 43 percent had been vaccinated. Nationwide, there have been at least 63 pediatric flu-related deaths since October 1.
Recognizing flu warning signs is critical too. However, new evidence shows another flu spike could be in the near future.
Shelby County experienced a peak of flu activity around mid-December.