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タイトルにもろにワクチン接種を受けた医療従事者って書いてあるじゃん…
メゾットのとこにもしっかりワクチン接種歴とあるし…

一番最後にあるInterpretationに書いてあるのが答えかと。

Interpretation
Breakthrough Delta variant infections are associated with high viral loads, prolonged PCR positivity, and low levels of VACCINE-INDUSE neutralizing antibodies, explaining the transmission between the vaccinated people. Physical distancing measures remain critical to reduce SARS-CoV-2 Delta variant transmission.