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As the summer travel season reaches its peak, the United States is facing a new surge of Covid-19 infections, with the Centers for Disease Control and Prevention (CDC) confirming significant case increases in 25 states, from Florida to Texas and California. This uptick marks the onset of a 2025 “summer wave”, driven by waning immunity in the population and the emergence of highly transmissible new variants.
What’s Driving the Summer Surge?
Public health experts point to a combination of virological, behavioral, and environmental factors:
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Fading immunity from previous vaccinations or infections.
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Emergence of new Omicron sub-variants—notably NB.1.8.1 (“Nimbus”) and XFG (“Stratus”)—which are spreading rapidly and are capable of evading immune protection.
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Human behaviors associated with summer, such as increased indoor gatherings due to air-conditioning, more frequent travel, and celebrations that bring people together in close quarters.
Details on the New Variants
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NB.1.8.1 (Nimbus): This Omicron sub-variant is now responsible for about 37% of recent U.S. cases (as of early June 2025). Most infections involve mild to moderate upper-respiratory symptoms, but reports highlight a distinctively severe “razor blade throat” said to be extremely painful. While highly transmissible, it does not cause severe illness in most cases.
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XFG (Stratus): Classified as a “Variant Under Monitoring” by the WHO, Stratus is rapidly expanding and is projected to become one of the dominant strains globally. Like other Omicron descendants, it mostly causes familiar symptoms such as congestion, mild cough, fever, and fatigue, with some patients also experiencing a hoarse or raspy voice. Severe illness remains uncommon according to current assessments.
Regional Impact
The South and West—including states like Florida, Texas, California, and Alabama—are seeing some of the largest spikes. No state is currently reporting a decline in cases; 21 other states have stable but elevated case numbers.
Expert Perspective
Historically, the U.S. has experienced Covid surges twice a year: a smaller one in summer and a larger wave in winter. Rising cases in July are consistent with this pattern. Health officials emphasize that immunity has waned, and with new variants on the rise, millions of Americans remain vulnerable to infection this summer. However, the risk of severe illness for most healthy adults remains low.
Common Symptoms
Alongside the sore throat uniquely associated with NB.1.8.1, current variants may cause:
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Nasal congestion
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Fatigue
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Cough (mild)
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Fever
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Loss of taste and smell
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Runny nose
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Muscle aches
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Loss of appetite
Less commonly, symptoms can also include diarrhea and nausea.
Disclaimer: This article is for informational purposes only and does not substitute for professional medical advice. For a full assessment or treatment regarding Covid-19 or related symptoms, please consult a qualified healthcare provider. NDTV and this report do not claim responsibility for individual health decisions based on the information provided here.
