International COVID 19 Citing the Delta variant, Pfizer pursues booster shots, but scientists are debating...

Citing the Delta variant, Pfizer pursues booster shots, but scientists are debating about it

Pfizer’s coronavirus vaccine may become slightly weaker over time, the company reported. But experts said that most people won’t need boosters anytime soon, reported The New York Times.

- Advertisement -

Biopharmaceutical company Pfizer announced on Wednesday (Jul 28) that a third shot of its Covid-19 vaccine could improve immunity against the virus. However, two doses offer “lasting and robust protection” against serious diseases.

The new data released by Pfizer shows that levels of antibodies that can target the more transmissible Delta variant increases up to fivefold in individuals aged between 18 and 55 years old who receive a third dose of its Pfizer-BioNTech vaccine.

Furthermore, the study showed antibody levels grow 11-fold among those aged 65 to 85.

The findings were based on a test on 23 individuals released by Pfizer. It has not yet been peer-reviewed or published in a journal.

- Advertisement 1-

Pfizer suggested that a third dose of the vaccine could improve immunity, although the need for booster shots is far from settled, reported The New York Times.

The subject of booster shots is being debated among scientists, with health experts questioning its priority when many of the population have not yet received the first dose.

The United States Centers for Disease Control and Prevention notes that the current vaccines protect people against all common Covid-19 variants.

It is also unclear if increased antibody levels directly imply better protection.

“Receiving a third dose more than six months after vaccination, when protection may be beginning to wane, was estimated to potentially boost the neutralizing antibody titers in participants in this study to up to 100 times higher post-dose three compared to pre-dose three,” said Dr Mikael Dolsten.

Dr Dolsten leads worldwide research, development and medical for Pfizer.

- Advertisement 2-

“These preliminary data are very encouraging as Delta continues to spread,” he noted.

Pfizer and BioNTech also released new safety and efficacy data on their vaccine on Wednesday, noting protection holds up for at least six months but could begin to decline towards the end of the stated period.

The pre-print findings were based on a trial involving 44,000 volunteers worldwide.

The vaccine’s efficacy peaked at more than 96 per cent beginning one week to around two months after the second dose. It eventually declined to about 83.7 per cent four to six months later, showing an average decline rate of about six per cent over the last two months.

“We are in ongoing discussions with regulatory agencies regarding a potential third-dose booster of the current vaccine and, assuming positive results, anticipate an emergency use authorization submission as early as August,” said Dr Dolsten.

- Advertisement 3-

A lab study released on Sunday (Jul 25) from Chinese researchers noted that antibodies triggered by the Sinovac vaccine decline below a key threshold from around six months after the second dose. A third shot could be necessary for a strong boosting effect.

Chinese researchers noted that the fully vaccinated participants who had followed the two- or four-week interval between each dose showed a 16.9 per cent and 35.2 per cent level of neutralizing antibodies above the threshold six months after the second dose. /TISG

Read related: Sinovac Covid-19 vaccine’s antibodies fade after 6 months, third shot could boost effect: Chinese study

Sinovac Covid-19 vaccine’s antibodies fade after 6 months, third shot could boost effect: Chinese study

 Follow us on Social Media

Send in your scoops to news@theindependent.sg 

- Advertisement -

Read More

Buy fish if you can’t afford chicken, President Halimah once said: Netizens point to pomfret’s pre-CNY price of $100 per kilo

Singapore -- As the price of premium fish such as pomfret and red grouper soar exponentially ahead of Chinese New Year, several netizens have taken to  quoting what President Halimah Yacob said in 2007 as a Member of Parliament. Back...

‘Proud of my contribution to Singapore law’ — Lim Tean celebrates pub case win

Singapore — Lawyer and opposition leader Lim Tean called a judgment handed down by the High Court on Thursday (Jan 27) as one of...

Man rescues mynah with cable ties on mouth & legs in Pasir Ris

Singapore — A man walking along Pasir Ris Street 71 on Jan 15 spotted a Javan mynah with a cable tie on its mouth...

Healing the Divide’s Iris Koh now in SGH, hit with more serious charge of criminal conspiracy to lie to MOH

Singapore – Iris Koh,  co-founder of controversial anti-vaccine group Healing the Divide, had her the charge against her last Sunday upgraded on Friday (Jan...

Stories you might’ve missed, Jan 28

It’s not just OCBC and Singapore, scammers are ripping off people across Asia Photo: screengrab/ BDO Unibank Inc Singapore —  The phishing scams that burst into...

Buy fish if you can’t afford chicken, President Halimah once said: Netizens point to pomfret’s pre-CNY price of $100 per kilo

Singapore -- As the price of premium fish such as pomfret and red grouper soar exponentially ahead of Chinese...

‘Proud of my contribution to Singapore law’ — Lim Tean celebrates pub case win

Singapore — Lawyer and opposition leader Lim Tean called a judgment handed down by the High Court on Thursday...

Man rescues mynah with cable ties on mouth & legs in Pasir Ris

Singapore — A man walking along Pasir Ris Street 71 on Jan 15 spotted a Javan mynah with a...

Healing the Divide’s Iris Koh now in SGH, hit with more serious charge of criminal conspiracy to lie to MOH

Singapore – Iris Koh,  co-founder of controversial anti-vaccine group Healing the Divide, had her the charge against her last...
Follow us on Social Media

Send in your scoops to news@theindependent.sg