How to tell if you have new 'Nimbus' Covid variant NB.1.8.1 or summer cold https://www.telegraph.co.uk/health-fitness/conditions/cold-flu/summer-cold-or-new-covid-strain/ Covid variant NB.1.8.1 ⟿ e.g. a severe sore throat known as a "razor blade sensation". This is a sharp, stabbing pain when you swallow, often at the back of the throat