WHO designates new coronavirus strain as ‘variant of concern’, names it ‘Omicron’

The variant, which was announced by scientists in South Africa on Thursday, was detected in two more countries, Israel and Belgium. Botswana and Hong Kong are the other countries where the variant has been found.

The WHO said about 100 genome sequences of the variant have been reported so far.

Fears that a new, fast-spreading coronavirus variant could potentially be more dangerous than even the Delta variant prompted several countries to impose restrictions on travel from affected regions, and caused stock markets across the globe to crash.

By evening, the World Health Organisation (WHO) had designated this variant, B.1.1.529, as a “variant of concern (VOC)”, and given it the name Omicron.

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The variant, which was announced by scientists in South Africa on Thursday, was detected in two more countries, Israel and Belgium. Botswana and Hong Kong are the other countries where the variant has been found.

The WHO said about 100 genome sequences of the variant have been reported so far. Many of the infected people were fully vaccinated, with at least one person in Israel having also received a third, booster, dose of vaccine.

India, which on Friday announced resumption of routine international air services from December 15, said it would step up screening of flyers, especially those from affected countries.

In an urgent note to state governments on Thursday, Health Secretary Rajesh Bhushan had said the emergence of the new variant had “serious public health implications”, and asked them to increase vigilance.

The scientific analysis till now suggests that the new variant has been spreading at a rate faster than any other variant, including Delta. The fact that several of the infected people were fully vaccinated, including one with a booster dose, is an indication that this variant also has considerable capability to evade the immune response.

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This means that this variant is a cause of worry on at least two of the three criteria that are used to assess how dangerous any new variant is. As of now, there is no information on its ability to cause severe disease, the third crucial criteria.

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“This variant has a number of mutations, some of which are concerning. Preliminary evidence suggests an increased risk of reinfection with this variant, as compared to other VOCs,” the WHO said in a statement.

“The number of cases of this variant appears to be increasing in almost all provinces in South Africa… This variant has been detected at faster rates than previous surges in infection, suggesting that this variant may have a growth advantage,” it said.

“Based on the evidence presented indicative of a detrimental change in Covid19 epidemiology…the WHO has designated B.1.1.529 as a VOC, named Omicron,” it said.

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The Delta variant, first discovered in India late last year, has been the deadliest variant of SARS-CoV2 on all these three counts till now. It is the dominant variant now in most regions, and is the reason behind the deadly second wave in India, and the ongoing surge in Europe and a few other regions.

Scientists The Indian Express spoke to, said it was too early to say whether the new variant was more lethal than Delta, but called for stricter surveillance.

“Not everything is known about this variant yet. Data is still coming in. As of now, we know that it has over 30 mutations, of which 10 are in the spike protein. Whether this variant turns out to be a faster spreading one, or one that has greater ability to evade immune response is still to be seen. But we need to be very alert,” virologist Shahid Jameel said.

Vineeta Bal, an immunologist associated with the Indian Institute of Science Education and Research (IISER), Pune, said the emergence of the variant was not an unexpected development, but authorities needed to respond with increased surveillance to ensure early detection and effective isolation.

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“Viruses mutate all the time. That is something to be expected. But we should be able to ensure that it does not gain a foothold in many people,” Dr Bal said.

She also emphasised on the need for making adequate supplies of vaccines available to South Africa, where the new variant is the most widespread. “This should be done on high priority so that future events like this one can be curtailed with better vaccine coverage,” she said.

Virologist Gagandeep Kang said the next two to three weeks were a crucial period for India, during which the genomic surveillance – the analysis of gene sequences – of the virus also needed to be stepped up significantly.

Anuradha Mascarenhas

Anuradha Mascarenhas is a Senior Editor at The Indian Express, based in Pune. With a career spanning three decades, she is one of the most respected voices in Indian journalism regarding healthcare, science and environment and research developments. She also takes a keen interest in covering women's issues . Professional Background Education: A gold medalist in Communication and Journalism from Savitribai Phule Pune University and a Master’s degree in Literature. Author: She authored the biography At The Wheel Of Research, which chronicles the life and work of Dr. Soumya Swaminathan, the former Chief Scientist at the WHO. Key Focus: She combines scientific accuracy with storytelling, translating complex medical research into compelling public and human-interest narratives. Awards and Recognition Anuradha has won several awards including the Press Council of India's national award for excellence in journalism under the gender based reporting category in 2019 and the Laadli Media award (gender sensitivity -2024). A recipient of the Lokmat journalism award (gender category-2022), she was also shortlisted for the RedInk awards for excellence in journalism-2021. Her debut book At The Wheel Of Research, an exclusive biography of Dr Soumya Swaminathan the inaugural chief scientist of World Health Organisation was also nominated in the Popular Choice Category of JK Paper AUTHER awards. She has also secured competitive fellowships including the Laadli Media Fellowship (2022), the Survivors Against TB – New Research in TB Media Fellowship (2023) and is part of the prestigious 2025 India Cohort of the WomenLift Health Leadership Journey.” Recent Notable Articles (Late 2025) 1. Cancer & Specialized Medical Care "Tata Memorial finds way to kill drug-resistant cancer cells" (Nov 26, 2025): Reporting on a breakthrough for triple-negative breast cancer, one of the most aggressive forms of the disease. Discipline, diet and purpose; How a 97-year-old professor defies ageing'' (Nov 15, 2025) Report about Prof Gururaj Mutalik, the first Head of Department at Pune's B J Government Medical College who at 97 credits his longevity to healthy habits and a strong sense of purpose. 2. Environmental Health (The "Breathless Pune" Series) Long-term exposure even to 'moderate' air leads to chronic heart, lung, kidney issues" (Nov 26, 2025): Part of an investigative series highlighting that even "safe" pollution levels are damaging to vital organs. "For every 10 µg/m3 increase in PM2.5 level, there was 6-8% jump in medicine sales" (Nov 23, 2025): Using commercial data to prove the direct link between air quality and respiratory illnesses in Pune. 3. Lifestyle & Wellness News "They didn't let cancer, diabetes and heart disease stop them from travelling" (Dec 22, 2025): A collaborative piece featuring survivors who share practical tips for traveling with chronic conditions. At 17, his BP shot up to 200/120 mmHG; Lancet study flags why child and teen hypertension doubled between 2000 and 2020'' (Nov 12,2025)--A report that focusses on 17-year-old-boy's hypertensive crisis and reflects the rising global trend of high blood pressure among children and adolescents. 4. Scientific Recognition & Infrastructure For promoting sci-comm, gender diversity: IUCAA woman prof highlighted in Nature" (Nov 25, 2025): Covering the global recognition of Indian women scientists in gender studies and physics. Pune researchers find a spiral galaxy like the Milky Way from early universe'' (December 3, 2025)- A report on how Indian researchers discovered a massive galaxy that existed when the universe was just 1.5 billion years old , one of the earliest to have been observed so far. Signature Beat: Health, Science & Women in Leadership Anuradha is known for her COVID-19 reportage, where she was one of the first journalists to provide detailed insights into the Covishield and Covaxin trials. She has a dedicated interest in gender diversity in health and science, often profiling women researchers who are breaking the "leaky pipeline" in STEM fields. Her writing style is scrupulous, often featuring interviews with top-tier scientists and health experts from various institutions. ... Read More

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