Antibodies triggered by Sinovac Biotech’s COVID-19 vaccine decline below a key threshold from around six months after a second dose for most recipients, although a third shot could have a strong boosting effect, a lab study has revealed.<\/p>\n
Chinese researchers reported the findings from a study of blood samples from healthy adults aged between 18-59 in a paper published on Sunday, which has not been peer-reviewed.<\/p>\n
For participants receiving two doses, two or four weeks apart, only 16.9% and 35.2% respectively still had a level of neutralising antibodies above the threshold six months after the second dose, the paper said.<\/p>\n
Those readings were based on data from two cohorts involving more than 50 participants each, while the study gave third doses to a total of 540 participants.<\/p>\n
When participants in some cohorts were given a third dose, about six months after the second, neutralising antibody levels after a further 28 days had increased around 3-5 fold from the levels seen four weeks after the second dose, the study showed.<\/p>\n
The study was conducted by researchers at disease control authorities in Jiangsu province, Sinovac, and other Chinese institutions.<\/p>\n
Researchers cautioned the study did not test the antibodies’ effect against more transmissible variants, and that further research was needed to assess antibody duration after a third shot.<\/p>\n","protected":false},"excerpt":{"rendered":"
Antibodies triggered by Sinovac Biotech’s COVID-19 vaccine decline below a key threshold from around six months after a second dose for most recipients, although a third shot could have a strong boosting effect, a lab study has revealed. Chinese researchers reported the findings from a study of blood samples from healthy adults aged between 18-59 […]<\/p>\n","protected":false},"author":2,"featured_media":11070,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[],"class_list":{"0":"post-11069","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-health"},"_links":{"self":[{"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/posts\/11069","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/comments?post=11069"}],"version-history":[{"count":1,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/posts\/11069\/revisions"}],"predecessor-version":[{"id":11071,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/posts\/11069\/revisions\/11071"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/media\/11070"}],"wp:attachment":[{"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/media?parent=11069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/categories?post=11069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dailykashmirpost.com\/eng\/wp-json\/wp\/v2\/tags?post=11069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}