Fractional or lower dosing has been used around the world for years as a means to overcome vaccine shortages.
Max Horberry is a freelance journalist based in London.
MORE FROM AUTHOR
Recent study finds a link between cardiac arrests and COVID-19, which could help to map the pandemic’s past and future.
Lockdown strain, overwhelmed health services and mistaken symptoms are leaving pregnant women at risk.
Scammers have so far stolen more than two million pounds sterling in coronavirus-related scams, say police.