Research Interpretation: Breakthrough Delta variant infections are associated with high viral loads, prolonged PCR positivity, and low levels of vaccine-induced neutralizing antibodies, explaining the transmission between the vaccinated people. Physical distancing measures remain critical to reduce SARS-CoV-2 Delta variant transmission
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3897733
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“This is consistent with the observations in the U.S. from Farinholt and colleagues, and congruent with comments by the director of the Centers for Disease Control and Prevention conceding COVID-19 vaccines have failed to stop transmission of SARS-CoV-2.”
https://www.johndayblog.com/2021/08/vaccine-diamond-princess.html?m=1