The Covid strains, XFB, dubbed Stratus, and NB.1.8.1, known as Nimbus, are fueling a surge in infections, with cases spiking specifically in the northeast last month in the US.
A croaky voice and a sharp, 'razor blade' sore throat are emerging as tell-tale signs of the latest Covid variants now sweeping the US.
The strains, XFB, dubbed Stratus, and NB.1.8.1, known as Nimbus, are fueling a surge in infections, with cases spi... [4960 chars]