The Center for Disease Control announced on April 3 that bacteria is showing a unusual antibiotic resistance across the United States.

According to the CDC press release, health departments in connection with the CDC Antibiotic Resistance lab discovered over 220 cases where germs have a “unusual” resistance to antibiotics in the past year.

“CDC’s study found several dangerous pathogens, hiding in plain sight, that can cause infections that are difficult or impossible to treat,” said CDC Principal Deputy Director Anne Schuchat in the press release. “It’s reassuring to see that state and local experts, using our containment strategy, identified and stopped these resistant bacteria before they had the opportunity to spread.”

The CDC classifies germs with unusual resistance those unable to be killed by most or all types of antibiotics. It also includes bacteria uncommon to the United States or those who have specific genes enabling them to spread their resistance to other bacteria.

According to the CDC vital signs report where the information was first published, scientists said antibiotic-resistant germs can spread rapidly and pose a large threat to the population without proper preventive measures.

The report also said, “lab tests uncovered unusual resistance more than 200 times in 2017 in ‘nightmare bacteria’ alone. With new resources nationwide, early and aggressive action—when even a single case is found—can keep germs with unusual resistance from spreading in health care facilities and causing hard-to-treat or even untreatable infections.”

The CDC press release introduced the new strategy to prevent a large outbreak of these antibiotic-resistant germs. It first calls for rapid identification of the bacteria by using infection control assessments, testing in persons who may contain the germ but not show symptoms and continued infection control assessments. These processes are said to have been proven effective before.

Several federal agencies are also involved in this “aggressive” approach of containing and combating unusual resistant bacteria. In addition to federal agencies, local health departments and local clinics are also joining in the fight.