Image courtesy of Kim Lenhardt.
Elizabeth Weise, USA TODAY
Though the flu is beginning to wane nationally, it is sickening and killing seniors at rates "higher than we've ever seen," a CDC flu expert said Friday.
Last week, the number of people older than 65 who died from a laboratory-confirmed case of influenza was 116 per 100,000. "We've kept rates since 2005 and we have never seen a rate this high," said Michael Jhung, an epidemiologist at the Centers for Disease Control and Prevention. "The highest we've ever seen in was 90 per 100,000."
He expects those numbers to go higher still. Hospitalization - and, in some cases, death - follows several weeks after a person first gets sick.
"We've still got several weeks of the season yet, so it's going to be much worse" before it's over, he said. "The deaths are still accumulating."
Each year, between 3,000 and 49,000 Americans die from influenza-related causes, the CDC estimates. So far this season, 45 children have died as a result of the flu. Numbers for adults won't be available until the flu season ends. The virus is surging in the West but, is waning nationally:
9.4% of deaths reported in CDC's 122 Cities Mortality Reporting System were due to pneumonia and influenza as of Jan. 26. That's well above the epidemic threshold of 7.2%, but down from 9.8% a week earlier.
The proportion of people visiting the doctor for influenza-like illness was 4.2% down from 4.3%the week before, CDC's FluView report showed. The baseline number for the year is 2.2%.
Flu remains "elevated" nationwide, with 42 states reporting widespread geographic influenza activity and seven reporting regional activity, CDC said. The previous week, 47 states had widespread activity.
Influenza is always more dangerous to people 65 and older, but it is worse this year because the prevalent flu strain - H3N2 - is especially dangerous to older people. H3N2 has not circulated much since 2005, so the people have little immunity to it unless they were vaccinated this year.
"It has come out from under a rock and it's now dominant because there is a larger population of susceptible people," said William Schaffner, a professor of preventive Medicine at Vanderbilt University in Nashville.
For that reason, Jhung said it's not too late to get vaccinated. If people, especially the elderly, start to feel ill, they should contact their doctor quickly. Antiviral drugs, taken within 48 hours of the onset of the flu, are helpful in preventing complications and keeping people out of the hospital, he said.
This year's flu season got off to an early start, hitting the East Coast especially hard in late December and early January. Several cities, including Boston and New York, declared flu emergencies.
"The wave this year went from the entire eastern part of the country and then moved west," Jhung said. Despite the downward tick, the flu continues to hit hard, especially in the West.
California, Oregon and Washington are still showing increases, said Jhung. While nationally 4.2% of visits to doctors offices are for flulike illnesses, in that part of the country it the figure it 5.9%, up from 4.6% the week before.
Flu rates are at the highest levels seen in the past four years in Los Angeles, according to the Los Angeles County Public Health Department. In Los Angeles, seven adults have died of flu, six of them over the age of 65. All had H3N2, the Public Health Department reported Thursday.
In San Diego, 19 people had died as of Tuesday, the majority of whom had underlying illnesses, according to the city's Health and Human Services Agency.
In Oregon, rates of flulike illnesses are high, though so far this season no children have died from flu.