are astrazenca, sinovac and sinopharm effect for the delta variant?

https://www.reuters.com/business/healthcare-pharmaceuticals/antibodies-triggered-by-chinese-covid-19-shots-less-effective-delta-variant-2021-06-25/

"Antibodies triggered by Chinese COVID-19 shots less effective on Delta variant - researcher"

"Antibodies triggered by two Chinese COVID-19 vaccines are less effective against the Delta variant compared with other strains but the shots still offer protection, a Chinese disease control researcher told state media."

"In the Guangdong outbreak ... none of those vaccinated infections became severe cases, and none of the severe cases were vaccinated," Feng said.