COVID wave looms in Europe as booster campaign makes slow start | Reuters
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines | The Scientist Magazine®
Safety and immunogenicity of the protein-based PHH-1V compared to BNT162b2 as a heterologous SARS-CoV-2 booster vaccine in adults vaccinated against COVID-19: a multicentre, randomised, double-blind, non-inferiority phase IIb trial - The Lancet