THE Omicron variant of the coronavirus has sparked fears that existing COVID-19 vaccines and treatment could be less effective against it. South Africa's National Institute for Communicable Diseases said early epidemiological data suggested Omicron was able to evade some immunity, but existing vaccines should still protect against severe disease and death. Here's what companies that make COVID-19 vaccines and drugs have said: MODERNA CEO Stéphane Bancel has warned that COVID-19 vaccines are unlikely to be as effective against the Omicron variant. The company has said a new vaccine tailored for Omicron should be available as soon as March. PFIZER-BIONTECH "We…