"The symptoms of all PCR-positive infections were typically “negligible”, the researchers report, and in many cases the infections “would not have been tested or reported, without the active surveillance”. Yet they had relatively high viral loads (Ct around 25), so were presumably infectious. Thus, with a quarter of triple-vaccinated and a fifth of quadruple-vaccinated healthcare workers becoming infected and apparently infectious during the wave, the researchers conclude the vaccine programme is a failure as it is not preventing the spread of Covid: “The major objective for vaccinating [healthcare workers] was not achieved.” However, the apparent efficacy against severe disease and death means older and vulnerable people may benefit from a fourth vaccine dose, they say."
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