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Highly transmissible Omicron has swept across countries, forcing governments to impose fresh measures and scramble to roll out vaccine booster shots.
Immunity against COVID-19 is a complex picture, and while there is evidence of waning antibody levels six months after vaccination, T-cells are also believed to play a vital role in providing protection.
Other signs that could also point to the direction of the virus include a sore throat, fever, unusual muscle pain, and persistent cough and dizziness, the report said.