Severe infections caused by group A streptococcus bacteria are on the rise in countries around the world, including the United States, according to new data from the Centers for Disease Control and Prevention.
Group A strep bacteria usually cause mild illnesses like strep throat and scarlet fever. But they can also cause more severe diseases, like the flesh-eating disease necrotizing fasciitis and streptococcal toxic shock syndrome, known as invasive group A strep infections.
These infections fell by 25% during the COVID-19 pandemic and were especially low in children. The number of milder infections also dropped. But in 2022, severe infections came roaring back, particularly in children.
such as Colorado and Minnesota.
Now in 2023, invasive infections are high in children in some parts of the country, even after respiratory viruses like the flu and respiratory syncytial virus (RSV) decreased in those areas. Some parts of the country also saw high rates of invasive infections in older adults.
Less severe strep A infections in children have returned to levels similar to or higher than those seen in prepandemic years.
A similar postpandemic resurgence in invasive infections has also been seen in other countries, including Canada, the United Kingdom, France, and Denmark.
Strep A is a very common bacteria that causes only mild or no symptoms in most people, and severe infections are usually quite rare. They tend to affect the most vulnerable people: those who have another virus, multiple chronic conditions, or an open wound.
People should watch for fever, headaches, or confusion during a strep infection, which all might signal a more severe illness.
A version of this article first appeared on Medscape.com.