Christopher Fenoglio

Contributing Writer

2019 Report: Flu cases increasing as vaccinations drop

The number of diagnosed cases of the flu has risen during the past four years just as the number of vaccinations continues a downward trend, states Andrew Downs, a health data scientist at Perception Health, a healthcare data intelligence company in Nashville, Tennessee.

These two trends place an increasing number of Americans at risk of developing the flu, especially high-risk patients with weakened immune systems like children under the age of two and adults 65 and older.

Andrew Downs, health data scientist

"After analyzing the information in more than 10 million de-identified medical claims, we tracked the number of flu cases over the past four years," says Downs. "The 2016-2017 flu season saw a 33% increase in diagnoses over the previous year, and the 2017-2018 season saw an even higher rate of diagnosed cases with an increase of 45%."

Downs graduated from the University of California - San Diego in three years, majoring in cognitive science with a focus on human computer interaction.

His work during the past few years monitoring the number of flu cases and vaccinations has produced important information for healthcare professionals. For instance, while the volume of flu cases dropped slightly during the 2018-2019 season, the overall number of diagnosed cases continues to trend upward (see below).

This rise in the number of flu cases could be partially explained by the slow, steady decline in the number of vaccinations during the same period (see below).

Reports released last year by the Centers for Disease Control and Prevention stated that fewer than 4 in 10 adults in the U.S. got shots during the 2017-2018 flu season, the lowest rate in seven seasons. This was a contributing factor in why the 2017-2018 season was the deadliest in decades.

The CDC explains that every flu season is different and the flu can affect people differently. Still, the agency reports, “millions of people get the flu every year, hundreds of thousands are hospitalized, and tens of thousands of people die from flu-related causes every year.”

An annual seasonal flu vaccine is still the best way to protect against the flu. Two weeks after vaccination, one’s body develops antibodies that protect against infection from the most common strains of the flu during the upcoming season.

“It’s important to get vaccinated early before the flu season really hits our communities,” says Tod Fetherling, CEO of Perception Health. “Some providers are even offering free vaccinations, so we recommend getting it done as soon as you can,” says Fetherling.

Vaccination counts traditionally peak in October, which is the month that the CDC recommends for getting a flu vaccine. The CDC and other organizations also sponsor National Influenza Vaccination Week the first full week in December.

The timing of this health observance is critical to increasing awareness of the vaccine before cases of the flu reach its zenith, usually in February. As the chart below shows, the peak month for flu cases has been inching earlier in the year, though last year saw a later peak than normal.

By increasing the number of vaccinations every season, especially in September and October, more people will be protected against the disease and won’t be a carrier to others. This task can keep you healthy and help protect your family, neighbors, and co-workers from contracting the disease.

For a list of locations that offer the flu vaccine in your area, go to VaccineFinder.org and enter your zip code.

Be well!