Antibody responses after a single dose of AstraZeneca Covid-19 vaccine in previously infected individuals were similar or higher compared to antibody responses in SARS-CoV-2 naïve participants who received two doses of Pfizer mRNA vaccine.

Antibody responses after a single dose of ChAdOx1 nCoV-19 vaccine in healthcare workers previously infected with SARS-CoV-2 – EBioMedicine

Commentary (on the preprint): Single dose of Oxford-AstraZeneca vaccine protective in previously infected recipients, suggests study – News Medical

Related: More data showing one dose of Pfizer vaccine may be enough for individuals who’ve had COVID. (studies on the subject)