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A sub-variant of the Omicron strain of coronavirus has been classified as a "variant of interest" by the World Health Organization, because of "its rapidly increasing spread". JN.1 has been found in many countries around the world, including India, China, UK and the United States, reports BBC.
The risk to the public is currently low and current vaccines continue to offer protection, the WHO says.
But it warns Covid and other infections could rise this winter.
Respiratory viruses such as flu, respiratory syncytial virus (RSV) and childhood pneumonia are also on the rise in the northern hemisphere.
The virus which causes Covid is constantly changing over time and sometimes this leads to new variants developing.
Omicron has been the globally dominant variant for some time.
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