Connect with us

Coronavirus (Covid-19)

Low immunity levels in some, despite 2 doses of AstraZeneca, Sinovac



PHOTO: Facebook/ กรุงเทพมหานคร โดยสำนักงานประชาสัมพันธ์ (Bangkok Metropolitan Administration)

A leading medical expert in Thailand has expressed concern that some people who’ve received both doses of either the AstraZeneca or Sinovac vaccine are showing low levels of immunity to Covid-19. According to a Nation Thailand report, Thiravat Hemachudha from the Health Science Centre of Emerging Diseases at Chulalongkorn University says that, 3 or 4 weeks after inoculation, some people show no immunity or low levels of 20 – 30%.

The report goes on to say that in order for a vaccine to be considered effective, the ability to stop a virus must be higher than 20% if immunity is to develop. It’s understood that vaccinated people will normally show an immune response that varies from low, to medium, to high, but that response must continue to increase following inoculation.

Thiravat cites the rabies vaccine as an example. Full inoculation requires injections on day zero, day 3, and day 7. Some patients will start to develop immunity around day 10 and everyone who’s vaccinated will show immunity by day 14.

Low levels of immunity, at less than 20%, are being seen in some people who were vaccinated on the same day and with the same vaccine, leading Thiravat to speculate that there may have been an issue with a particular batch. He adds that some of those showing very low levels of immunity have underlying health conditions, including diabetes, which will have an impact on their immune system.

According to the Nation Thailand report, a number of Covid-19 patients have become infected despite having 2 doses of Sinovac or 1 dose of AstraZeneca. Thiravat says that in vaccinated individuals where immunity does not increase, or where it increases to less than 68%, a third dose could be beneficial.

SOURCE: Nation Thailand


Get more from The Thaiger

Join the conversation and have your say on Thailand news published on The Thaiger.

Thaiger Talk is our new Thaiger Community where you can join the discussion on everything happening in Thailand right now.

Please note that articles are not posted to the forum instantly and can take up to 20 min before being visible. Click for more information and the Thaiger Talk Guidelines.

A seasoned writer, with a degree in Creative Writing. Over ten years' experience in producing blog and magazine articles, news reports and website content.

Follow Thaiger by email:

Destination Guide8 hours ago

Best areas to live in Phuket (2022)

Video8 hours ago

Thailand News Today | Fears of shenanigans in Mountain B Pub fire investigation

Travel8 hours ago

5 vineyards and wineries in Thailand all wine lovers should know

Sponsored18 hours ago

Super luxury villas in Phuket with breathtaking ocean views

Thailand9 hours ago

Thai neitzens angry at SUV driver using a siren just to use toilet

Thailand9 hours ago

New poll says people from Thailand more relaxed about Covid-19

Thailand10 hours ago

Rama 2 Road guilty of being a repeat accident offender

Join the conversation on the Thaiger Talk forums today!
Thailand11 hours ago

Body of one teacher found in double suicide pact in SE Thailand

Thailand12 hours ago

Son who tried to starve mother to death dies of TB in NE Thailand

Crime12 hours ago

Mystery 911 emergency service call turns out to be a monkey

Thailand13 hours ago

Hot gran bowled over by Shane Warne before he died in Thailand

Thailand14 hours ago

Soi Dog Foundation pledges to neuter 1 million animals in 2 years

Thailand14 hours ago

EPL praises Thailand for crackdown on illegal footie sites

Pattaya15 hours ago

Sick German man fails in suicide attempt in Pattaya

Video15 hours ago

Thailand approves all time high electricity price | GMT

Economy15 hours ago

Instant noodles, a staple budget food, fighting to increase prices

Thailand11 months ago

Morning Top Stories Thailand | Police to end protests, Human Trafficking | September 14

Thailand1 year ago

Thailand News Today | Thai Airways in rehab, All go for Songkran | March 4

Tourism1 year ago

Phuket’s nightlife. Yes, bars and clubs are still open | VIDEO

Phuket1 year ago

Thailand News Today | Covid passport talks, Thai Airways heads to court | March 2

Tourism1 year ago

Phuket Thai food treats you need to try | VIDEO

Thailand1 year ago

Thailand News Today | Bars, pubs and restaurants ‘sort of’ back to normal | Feb 23

Tourism1 year ago

In search of Cat & Dog Cafés in Phuket Town | VIDEO

Thailand2 years ago

Thailand News Today | Gambling crackdown, Seafood market to reopen, Vlogger challenge | Jan 21

Thailand2 years ago

Thailand News Today | Covid testing for visas, Business impact, Vaccine approval | January 19

Thailand2 years ago

Thailand News Today | Weekend Bangkok bombs, Thailand fires, Covid update | January 18

Thailand2 years ago

Thailand News Today | Stray car on runway, Indonesian quake, 300 baht tourist fee | January 15

Thailand2 years ago

Thailand News Today | Governor off respirator, sex-trafficking arrest, condo prices falling | January 14

Thailand2 years ago

Thailand News Today | Chinese vaccine, Thailand ‘drug hub’, Covid update | January 13

Thailand2 years ago

Thailand News Today | Bangkok may ease restrictions, Phuket bar curfew, Vaccine roll out | January 12

Thailand2 years ago

Thailand News Today | Covid latest, Cockfights closed down, Bryde’s Whale beached | January 11