Mattyj
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In so far as breakthrough cases are concerned, the message so far from this data appears to simply lean toward maintaining caution in the form of face masks, among other strategies. Vaccination still makes complete sense.
The CDC report actually said: The findings in this report are subject to at least four limitations. First, data from this report are insufficient to draw conclusions about the effectiveness of COVID-19 vaccines against SARS-CoV-2, including the Delta variant, during this outbreak.
The Associated Press article said:The documents were obtained by The Washington Post. As they note, COVID-19 vaccines are still highly effective against the delta variant at preventing serious illness and death.
The Provincetown outbreak and the documents highlight the enormous challenge the CDC faces in encouraging vaccination while acknowledging that breakthrough cases can occur and can be contagious but are uncommon.