Sinovac, Sinopharm shots prevent severe illness from Delta variant - study

China-developed vaccines based on inactivated virus particles had succeeded in preventing all cases of severe or critical illness during an outbreak involving the Delta Covid-19 variant in Guangdong, researchers reported.

The researchers also found that two doses of the vaccines were 69.5 percent effective in preventing pneumonia (ie moderate disease), though a single dose had negligible effect.

The study...