ATLANTA — It turns out this year's flu shot is doing a startlingly dismal job of protecting older people, the most vulnerable age group.
The vaccine is proving only 9 percent effective in those 65 and older against the harsh strain of the flu that is predominant this season, the Centers for Disease Control and Prevention said Thursday.
Health officials are baffled as to why this is so. But the findings help explain why so many older people have been hospitalized with the flu this year.
Despite the findings, the CDC stood by its recommendation that everyone over 6 months get flu shots, the elderly included, because some protection is better than none, and because those who are vaccinated and still get sick may suffer less severe symptoms.
"Year in and year out, the vaccine is the best protection we have," said CDC flu expert Dr. Joseph Bresee.
Overall, across the age groups studied, the vaccine's effectiveness was found to be a moderate 56 percent, which means those who got a shot have a 56 percent lower chance of winding up at the doctor with the flu. That is somewhat worse than what has been seen in other years.
For those 65 and older, the vaccine was only 27 percent effective against the three strains it is designed to protect against, the worst level in about a decade. It did a particularly poor job against the tough strain that is causing more than three-quarters of the illnesses this year.
It is well-known that flu vaccine tends to protect younger people better than older ones. Elderly people have weaker immune systems that don't respond as well to flu shots, and they are more vulnerable to the illness and its complications, including pneumonia.
But health officials said they don't know why this year's vaccine did so poorly in that age group.
- From 0.3 to 81.1: What percentage of each...
- Oil slick not from missing Malaysian plane;...
- Malaysian plane mystery: Stolen passports, 5...
- Vietnam says it may have found missing jet's...
- Supreme Court sides with Wyoming landowner;...
- Senate Democrats choose election strategy:...
- Jet may have turned; suspicious passengers...
- Vietnam says cannot find object from missing jet
- Obama administration allows 2-year... 28
- Disney ending funding to Boy Scouts in... 22
- Early auditions for 2016 Republican... 22
- Half of millennials more likely to lean... 19
- Rutgers faculty council pushes for... 14
- US announces visa restrictions on Russians 9
- Survey: Uninsured rate drops from 17.1... 9
- Oil slick not from missing Malaysian... 9