Much has been said about how quickly Omicron can spread, but another question is its ability to reinfect.
Omicron has been the main Covid strain in the UK for about a month, leading to a tremendous surge in cases around the world.
At this point, hundreds of thousands of Brits have already come down with Omicron, but regrettably, scientists report people can get infected again.
US epidemiologist Eric Feigl-Ding is one of the experts who have explained how that can happen.
Getting reinfected with Omicron is 'certainly possible' down to a few reasons, said the senior fellow at the Federation of American Scientists in Washington DC.
Can you get reinfected with Omicron - and what are the chances?
Dr Feigl-Ding tweeted: "There are lots of recent anecdotes about new #Omicron reinfections after a recent Omicron infection."
He continued: "It's certainly possible if your first Omicron infection was a low-dose one that didn't stimulate your immune system enough or if you’re immunocompromised. Be careful folks."
His tweet was in response to an article that quoted experts including Dr Stanley Weiss, professor of epidemiology at Rutgers University in the US.
"Yes, you can get Omicron twice," said Dr Weiss.
He cited a lecture he attended by a virologist in South Africa who said doctors in the country had seen cases of reinfections.
Dr Weiss said: "Omicron is highly contagious and it would appear to not induce fantastic protective immunity."
The remarks echo findings from Imperial College London in December that estimated the risk of reinfection from Omicron to be 5.4 times greater than the Delta variant.
Imperial researchers also found "no evidence" of Omicron being less severe than Delta.
The rate of reinfection from Omicron is not yet known, but vaccines have been shown to be less effective against the new variant.
The World Health Organisation cited early evidence that Omicron can evade immunity from vaccines and previous infection.
However, boosters were shown to prevent symptoms in 75 per cent of Omicron cases, according to the UK Health Security Agency.
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