Health authorities in Britain and the United States are monitoring a renewed rise in Covid-19 cases linked to two newer variants: XFB, known as Stratus, and NB.1.8.1, called Nimbus. While waves of infection are not new, this surge has drawn attention because of how quickly these strains are spreading.
Data show case rates have roughly doubled since late summer, coinciding with the start of the fall and winter respiratory season. In the UK, test positivity has climbed above 8 percent, with hospital admissions rising modestly. In the U.S., wastewater surveillance indicates moderate national spread, with several states reporting very high viral levels.
What makes this wave notable is its symptom profile. Many patients report an unusually sore throat and a hoarse or croaky voice, sometimes described as feeling like “razor blades.” These symptoms often appear alongside headaches, cough, congestion, and extreme fatigue.
Clinicians say the symptoms can feel more intense than those seen with earlier Omicron subvariants, even if overall illness severity has not dramatically increased. Because flu and RSV are circulating at the same time, health officials stress the importance of testing to distinguish between illnesses.
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