With new versions forcing vaccine makers to re-test jabs, the virus that causes Covid-19 has proven highly unpredictable. But latest variant to sweep globe has persuaded some experts that long hoped-for collective immunity is in sight, and that virus may be evolving into a relatively benign seasonal illness.
Omicron has proven particularly contagious, infecting people thought to have immunity conferred by vaccines or a bout with disease itself. But while Omicron is driving a record number of cases in countries around the world, the illness is generally less severe, compared to previous variants. More people getting Omicron and recovering, combined with more vaccinations, could be key to boosting collective defences against almost any form of Covid, some experts have said.
Lower rates of hospitalisation due to Omicron also suggests Covid-19 might evolve into a weaker form, similar to coronaviruses long circulating in general population. "Perhaps we are witnessing the beginning of an evolution towards a more banal virus like others we know," said Alain Fischer, who coordinates France's pandemic vaccine response.
Clinical virologist Julian Tang reacting to a UK study on Omicron's lesser severity, said he imagined one day repeat vaccination and other measures would only be necessary for most vulnerable.
"I am still hopeful that virus will eventually become more like other common cold coronaviruses -- perhaps over next one to two years," he said.These conjectures have been embraced by public health officials. Speaking before legislature this week, French health minister Olivier Veran said "maybe this will be wave that allows us to acquire a kind of immunity".
