A new coronavirus variant named Omicron is triggering global alarm. Vaccine manufactures, including Pfizer and AstraZeneca, are testing their doses against Omicron, but how likely is it that the world's current vaccines, and anti-virus pills, will be effective? Professor Mike Toole, an epidemiologist with the Burnet Institute in Australia, says it is easier to modify mRNA vaccines than others when targeting new variants and that antivirals should work against new variant.