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Moderna 76% effective against Delta, Pfizer only 42%: Study

IANS
Updated: August 13th, 2021, 07:30 IST
in International, Sci-Tech
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Vaccine

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London: Vaccines against Covid-19 that were developed by US drug makers Pfizer and Moderna may not be as effective against the ‘Delta’ variant compared to as they were against the original strain of the virus, suggests a new study.

Researchers from the Mayo Clinic in Minnesota, US, found that the Pfizer-BioNTech vaccine was only 42 per cent effective against infection in July, while the Moderna vaccine was only 76 per cent effective, the Daily Mail reported.

“Comparing rates of infection between matched individuals fully vaccinated with mRNA-1273 (Moderna Covid vaccine) versus BNT162b2 (Pfizer Covid vaccine) across Mayo Clinic Health System sites in multiple states (Minnesota, Wisconsin, Arizona, Florida, and Iowa), mRNA-1273 conferred a two-fold risk reduction against breakthrough infection compared to BNT162b2,” the researchers wrote in the study, not yet peer reviewed, and published on pre-printer server medRxiv.org.

For the study, the team gathered data on more than 25,000 Minnesotans from January to July.

From January to June, the vaccines as claimed remained effective around 90 per cent, but began dipping in June and largely dropped in July as the variant took hold in the US.

The change in vaccine effectiveness corresponds with a massive surge in the prevalence of the Delta variant in Minnesota, growing from 0.7 per cent prevalence in May to more than 70 per cent in July, the study showed.

Meanwhile, the ‘Alpha’ variant, the previous dominant strain in the US, decreased in prevalence from 85 per cent to 13 per cent over the same time period.

The US is currently seeing a spike in infections and death due to the Delta variant. As of Thursday morning, the overall caseload and death toll in the US stood at 36,185,761 and 618,454, respectively, according to Johns Hopkins University. It is projected to increase in the coming weeks.

However, the vaccines are still effective in preventing hospitalisations and severe cases from the virus, with both having a hospitalisation rate of under 25 per cent, the researchers said.

Last month, Pfizer published data which showed that its vaccine’s efficacy drops to 86 per cent after six months.

But booster shots, expected to be rolled out soon, can help enhance immunity to the virus and protect against more resistant variants.

IANS 

Tags: COVIDDeltaModernaPfizervaccine
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China renews war threats as Taiwan launches its military exercises Beijing: China Thursday renewed its threat to attack Taiwan following almost a week of war games near the island. Taiwan has called Beijing's claims to the self-governing democracy “wishful thinking" and launched its own military exercises. Taiwan's “collusion with external forces to seek independence and provocation will only accelerate their own demise and push Taiwan into the abyss of disaster,” Chinese Foreign Ministry spokesperson Wang Wenbin said at a daily briefing. “Their pursuit of Taiwan independence will never succeed, and any attempt to sell the national interest will be met with a complete failure," Wang told reporters. China's attempt to intimidate the Taiwanese public and advertise its strategy for blockading and potentially invading the island was nominally prompted by a visit to Taipei last week by US House Speaker Nancy Pelosi. The US, Japan and allies have denounced the exercises, with the Group of Seven industrialised nations issuing a statement at a recent meeting expressing its concern. On Wednesday, Britain's government summoned Chinese Ambassador Zheng Zeguang to the Foreign Office to demand an explanation of "Beijing's aggressive and wide-ranging escalation against Taiwan”. Taiwan says Beijing used Pelosi's visit as a pretext to raise the stakes in its feud with Taipei, firing missiles into the Taiwan Strait and over the island into the Pacific Ocean. China also sent planes and ships across the midline in the strait that has long been a buffer between the sides, which separated amid civil war in 1949. In a lengthy policy statement on Taiwan issued Wednesday, China distorted the historical record, including the United Nations' 1972 resolution that transferred the China seat on the Security Council from Beijing to Taipei, Taiwan's Cabinet-level Mainland Affairs Council said. The Chinese statement also discarded a pledge not to send troops or government officials to Taiwan that was contained in previous statements. The UN resolution makes no mention of Taiwan's status, although China regards it as a foundational document proclaiming the Communist Party's right to control over the island. The Taiwanese council's statement said China was orchestrating its moves against Taiwan ahead of the ruling Communist Party's 20th National Congress to be held later this year. President and party leader Xi Jinping is expected to receive a third five-year term at the conclave, after leading a relentless crackdown on political figures accused of corruption, human rights activists and civil society groups. Xi's suppression of free speech and political opposition in Hong Kong was also seen as a factor behind Taiwan's President Tsai Ing-wen winning a second term in 2020. China says it plans to annex Taiwan under the now widely discredited “one country, two systems" format applied in Hong Kong. The concept has been thoroughly rejected in Taiwanese public opinion polls in which respondents have overwhelmingly favoured the status-quo of de-facto independence. The Chinese statement is “full of wishful thinking, and ignores the facts," the Mainland Affairs Council said in its press release. The “crude and clumsy political operations by the Beijing authorities further highlight its arrogant thinking pattern of attempting to use force to invade and destroy the Taiwan Strait and regional peace," the release said. “The authorities in Beijing deceive themselves. We warn the Beijing authorities to immediately stop threatening Taiwan with force and spreading false information," it said. Taiwan placed its military under high alert during the Chinese drills but took no direct countermeasures. It held artillery drills off its southwestern coast facing China that ran through Thursday, illustrating the challenges the People's Liberation Army would face were it to launch an invasion across the strait. AP China, Taiwan

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