WASHINGTON, United States (AFP) — Half of all US adults have now received full Covid-19 vaccines, the White House said Tuesday, marking another huge milestone in the fight against the pandemic. “Now 50% of all American adults are fully vaccinated,” tweeted Cyrus Shahpar, Covid-19 data director for the White House. That means half the adult population has received either two doses of the Moderna or Pfizer/BioNTech vaccines, or one of the single-dose Johnson & Johnson. […]