It's not hard to find figures backed by lab tested data and 'm sure there will be more high quality research forthcoming. bwww1.racgp.org.au/newsgp/clinical/delta-raises-covid-reinfection-risk-by-46-study
In an analysis of cases recorded from 12 April to 27 June this year, there were a total 83,197 people who tested positive for COVID-19 in the 11-week period covered by the study. Of those, 980 were possible reinfections.
According to the briefing, the data suggests the risk of reinfection does not increase until 180 days after the first infection.
The authors write that ‘preliminary analysis of national surveillance data finds an increased risk of reinfection with Delta, compared to Alpha’, with the overall chances around 46% higher compared to the Alpha variant.
The analysis of positive cases within the general population appears to be reinforced by a study monitoring positive cases across 35,684 National Health Service workers in England, with a rising number of reinfections in the most recent months as Delta increasingly dominated in the area.
The authors also suggest that the emergence of a new strain will likely further increase the chances of reinfection....
Dr Roeske suggests there is a level of reassurance given the low number of possible reinfection cases, which was calculated at 1.2% of the total number of cases analysed for the PHE study.
...Associate Professor Ian Mackay, a virologist from the University of Queensland, told newsGP at the time that it was not a surprise and that he believed the true number was likely to be much higher than officially recorded.
‘I suspect reinfection is happening a lot more often than we have bothered to find yet. It’ll be happening more frequently in areas where there’s lots of transmission,’ he said.