Two new Covid variants, Stratus (XFV) and Nimbus (NB.1.81), are rapidly spreading across the US. Doctors report unusual symptoms and warn of long-lasting effects, even in mild cases.
Two new Covid variants, named Stratus (XFV) and Nimbus (NB.1.81), are sweeping across the United States, causing a surge in infections. While the variants share some familiar symptoms with previous strains, doctors are warning of unusual and more severe symptoms that could have lasting effects, even for those with mild cases.
The surge in cases has been most notable in the northeastern region, beginning in late August and peaking in mid-September. The Centers for Disease Control and Prevention (CDC) reports that national Covid wastewater levels, a key indicator of community spread, are at ‘moderate’ levels. However, four US states—Nevada, Connecticut, Utah, and Delaware—are currently experiencing ‘very high’ levels of infection.
These variants are particularly dangerous for vulnerable groups, including older adults and individuals with underlying health conditions or weakened immune systems. While some patients experience typical Covid symptoms like headaches, fatigue, and a runny nose, experts are raising alarms about the unusual symptoms caused by these new strains.
Dr. Aaron Glatt, an infectious disease expert at Mount Sinai Hospital in New York, shared that a common complaint among patients is ‘severe pain,’ particularly in the throat. Some patients describe the pain as feeling as though their throat is “covered with razor blades.” Although this sensation is not unique to Covid-19, Dr. Glatt noted that it has been reported more frequently in patients infected with the latest variants.
Additionally, some experts point to declining Covid vaccination rates as a possible contributor to the increase in cases. A recent CDC panel vote declined to recommend the Covid vaccine for ‘individual decision-making,’ which has led to concern that fewer people are getting vaccinated and more people are becoming susceptible to infection.
Dr. Tyler Evans, a former chief medical officer for New York City during the first wave of the pandemic, emphasized that while the current strains of Covid are not more severe than previous variants, the virus is “clearly on the rise again.” He warned that rising transmission rates could still pose significant risks for those with chronic conditions or limited access to healthcare.
“The dominant strain in the US right now is an Omicron subvariant called Nimbus (NB.1.81),” Dr. Evans explained. “It spreads quickly but is not more severe than earlier forms. However, it can still be dangerous for older adults and people with weakened immune systems.”
Dr. Laura Malone, the director of the Pediatric Post-Covid-19 Rehabilitation Clinic at Kennedy Krieger Institute, also expressed concern about the long-term effects of Covid. Even mild infections can lead to lingering symptoms, such as long Covid. “Just because you didn’t develop long Covid after your first infection, it doesn’t mean you’re out of the woods,” Dr. Malone said.
Despite these concerns, there is some positive news. Covid wastewater levels have begun to decline, showing signs of a slowing in community spread during the week of September 13. However, the ongoing high levels in states like Nevada, Connecticut, Utah, and Delaware continue to be a major concern.
The warning from experts is clear: while the situation is improving, continued vigilance is necessary, especially for vulnerable populations. Rising cases should lead to increased preparedness, but panic is not required.
