seems fine:
"Pfizer and BioNTech have decided to halt a large US trial of their updated COVID-19 vaccine in healthy adults aged 50 to 64, after failing to find enough people willing to take part in it"
seems fine:
"Pfizer and BioNTech have decided to halt a large US trial of their updated COVID-19 vaccine in healthy adults aged 50 to 64, after failing to find enough people willing to take part in it"
Same. And I would love to have been offered the chance...