COVID reinfection rate low: UK study

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The rate of Covid-19 reinfections "remains low", according to new analysis in the UK.

When people do get infected for a second time, the virus is much less likely to cause serious illness, according to Britain's Office for National Statistics (ONS).

Reinfections become more likely as time goes on, the analysis suggested. It also highlighted how some people are more likely to be reinfected than others.

Kara Steel, senior statistician for the Covid-19 Infection Survey, said: "The analysis shows that the estimated number of Covid-19 reinfections in the UK remains low.

"It's also encouraging to see that when reinfections do occur, generally they are less likely to cause serious illness.

"This is likely due to high levels of antibodies as a result of natural immunity and vaccination, giving protection against the virus."

The ONS examined data on people taking part in its Covid-19 study.

Researchers looked at information on 20,262 participants who were deemed to be "at risk of reinfection" - participants were deemed as such if 120 days had lapsed since their original infection or those who had four negative tests following original infection.

A total of 296 cases of reinfection were identified.

Of these, around 137 people were deemed to have a higher viral load.

"The number of reinfections is low overall, and reinfections with a high viral load (which are more likely to cause illness) are even lower," the ONS report stated.

The researchers also concluded that "reinfections become more likely the longer participants are 'at risk' for reinfection".

Reinfections were more common after the Delta variant became the dominant strain, the ONS found.

People who had a lower viral load during their original infection - possibly because they generated a weaker immune response when they had a milder infection - appeared to have a higher risk of reinfection.

The data also pinpoint some characteristics linked to a higher or lower risk of reinfection, these include:

- Women are slightly more likely to get reinfected than men.

- Frontline healthcare workers have a slightly lower risk of reinfection than those who do not work in this sector.

- People who experienced symptoms at the time of their original infection were less likely to be reinfected.

- Those living with long-term health conditions appeared to have a slightly higher risk of reinfection.

- People who had received two doses of vaccine were less likely to be reinfected.

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