Moderna may be superior to Pfizer against Delta variant — breakthrough odds rise with time.

Moderna may be superior to Pfizer against delta variant — breakthrough odds rise with time – CNBC

Original Study 1 (preprint): Comparison of two highly-effective mRNA vaccines for COVID-19 during periods of Alpha and Delta variant prevalence – medRxiv

Original Study 2 (preprint): Neutralizing antibody responses to SARS-CoV-2 variants in vaccinated Ontario long-term care home residents and workers – medRxiv

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Study shows AstraZeneca and Pfizer vaccines are effective against Delta variant, but both doses are needed.