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Micrograph of Methicillin-Resistant Staphylococcus aureus (MRSA) (Photo: NIAID)

New CDC Report Raises Alarm About Growing Threat of 'Nightmare Bacteria'

U.S. public health officials found bacteria with "unusual" resistance to antibiotics in 27 states last year

Jessica Corbett

Adding to mounting concerns about widespread antibiotic resistance, U.S. public health officials detected more than 220 cases of what they described as "nightmare bacteria" across more than half the country last year, according to a new government report.

In just nine months of surveillance during 2017, the Centers for Disease Control and Prevention (CDC) found "nightmare bacteria" with "unusual" resistance in 27 states, fueling the agency's warnings that "antibiotic-resistant germs can spread like wildfire."

The CDC considers antibiotic-resistant germs "unusual" if they are: resistant to all or most antibiotics; uncommon in a geographic area or the U.S.; or have genes that allow them to spread their resistance to other germs.

These "dangerous pathogens, hiding in plain sight...can cause infections that are difficult or impossible to treat," explained CDC principal deputy director Dr. Anne Schuchat. "Taking a terrible human toll, two million Americans get infections from antibiotic resistance and 23,000 die from those infections each year."

In response to this growing threat to public health, the CDC has launched a containment strategy that includes a nationwide lab network for identifying new and "unusual" antibiotic-resistant germs. 

Last year, as the CDC's new Vital Sign report outlines, the agency's nationwide network of labs tested 5,776 samples for "genes that were highly resistant or rare with special resistance that could spread."

"Of the 5,776, about one in four of the bacteria had a gene that helps it spread its resistance. And there were 221 instances of an especially rare resistance gene," Schuchat told reporters in a press briefing.

Patients who had contracted the "nightmare bateria" were at hospitals as well as healthcare facilities such as nursing homes. They were battling pneumonia, urinary tract infections, blood stream infections, and other types of infections. Although the report did not detail how many cases were fatal, Schuchat noted past research suggests "up to 50 percent can result in death."

While Schuchat admitted that the number of "nightmare bacteria" cases was higher than she expected, she added, "We hope though that this won't be an inevitable march upward, but that by finding them early when there's only one in the facility we can stop this from becoming very, very common."

The CDC containment strategy calls for a coordinated effort among healthcare facilities, labs, health departments, and CDC's lab network to rapidly identify resistance; implement infection control assessments; test patients who are not showing symptoms but may carry and spread the germ; and continue infection control assessments until the spread of that particular germ has stopped.

"Health departments using the approach have conducted infection control assessments and colonization screenings within 48 hours of finding unusual resistance and have reported no further transmission during follow-up over several weeks," the agency said in a statement. For the superbug CRE, "estimates show that the containment strategy would prevent as many as 1,600 new infections in three years in a single state—a 76 percent reduction."


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