https://www.bbc.com/news/world-asia-china-57817591
อาจต่ำลงถึงระดับ 20% แต่ก็ยังป้องกันการป่วยระดับเข้า รพ และตายได้ดีพอควร
Prof Ben Cowling, head of epidemiology and biostatics at University of Hong Kong, said despite having a "modest efficacy" against symptomatic Covid, both Sinovac and Sinopharm give "very high level of protection" against severe disease.
"That means that these inactivated vaccines would have already saved a lot of lives," he told the BBC.
Based on studies trying to model immune protection from the virus, Prof Cowling estimates the protection offered by inactivated virus vaccines against the Delta variant could be as much as 20% lower compared to the original strain.
His calculations suggest an even larger reduction against the Beta variant first found in South Africa, which is the one that most differs from the original virus.
Professor Jin Dong-yan, a virologist also from the University of Hong Kong, told the BBC it's "expected" that the efficacy of the Chinese vaccines will go down against the variants, including Delta.
But he said "Sinovac and Sinopharm are good vaccines" and people who do not have access to vaccines with higher efficacy should still receive their injections.
รายงานจาก BBC เสนอ Sinovac, Sinopharm vaccines ป้องกันการติดเชื้อต่อสายพันธ์ใหม่ได้น้อยมาก
อาจต่ำลงถึงระดับ 20% แต่ก็ยังป้องกันการป่วยระดับเข้า รพ และตายได้ดีพอควร
Prof Ben Cowling, head of epidemiology and biostatics at University of Hong Kong, said despite having a "modest efficacy" against symptomatic Covid, both Sinovac and Sinopharm give "very high level of protection" against severe disease.
"That means that these inactivated vaccines would have already saved a lot of lives," he told the BBC.
Based on studies trying to model immune protection from the virus, Prof Cowling estimates the protection offered by inactivated virus vaccines against the Delta variant could be as much as 20% lower compared to the original strain.
His calculations suggest an even larger reduction against the Beta variant first found in South Africa, which is the one that most differs from the original virus.
Professor Jin Dong-yan, a virologist also from the University of Hong Kong, told the BBC it's "expected" that the efficacy of the Chinese vaccines will go down against the variants, including Delta.
But he said "Sinovac and Sinopharm are good vaccines" and people who do not have access to vaccines with higher efficacy should still receive their injections.