A one-time lockdown will not halt the new coronavirus and repeated periods of social distancing may be required into 2022, Harvard scientists have predicted.
Their study came as the United States entered the peak of its Covid-19 caseload this week and worldwide cases approached 2,000,000 on Wednesday.
The Harvard team's computer simulation, published in the journal Science on Tuesday, assumed that Covid-19 will become seasonal, like closely related coronaviruses that cause the common cold, with higher transmission rates in colder months.
But much remains unknown, including the level of immunity in people who had the virus and recovered, and how long it lasts, the authors said.
Social distancing was so effective that virtually no population immunity is built
"We found that one-time social distancing measures are likely to be insufficient to maintain the incidence of Sars-CoV-2 within the limits of critical care capacity in the United States," said lead author Stephen Kissler from Harvard's TH Chan School of Public Health.
Sars-CoV-2 is the scientific name for the 'new coronavirus', which causes Covid-19.
"What seems to be necessary in the absence of other sorts of treatments are intermittent social distancing periods," he said.
Widespread viral testing would be required in order to determine when the thresholds to re-trigger distancing are crossed, said the authors.
The duration and intensity of lockdowns can be relaxed as treatments and vaccines become available. But in their absence, on and then off distancing would give hospitals time to increase critical care capacity to cater for the surge in cases that would occur when the measures are eased.
"By permitting periods of transmission that reach higher prevalence than otherwise would be possible, they allow an accelerated acquisition of herd immunity," said co-author Marc Lipsitch.
Conversely, too much social distancing without respite can be a bad thing. Under one modeled scenario "the social distancing was so effective that virtually no population immunity is built," the paper said, hence the need for an intermittent approach.
The authors acknowledged a major drawback in their model is how little we currently know about how strong a previously infected person's immunity is and how long it lasts.
Virus likely here to stay
At present the best guesses based on closely-related coronaviruses are that it will confer some immunity, for up to about a year. There might also be some cross-protective immunity against Covid-19 if a person is infected by a common cold-causing betacoronavirus.
One thing however is almost certain: the virus is here to stay. The team said it was highly unlikely that immunity will be strong enough and last long enough that Covid-19 will die out after an initial wave, as was the case with the Sars outbreak of 2002-2003.
Antibody tests that have just entered the market and look for whether a person has been previously infected will be crucial in answering these vital questions about immunity, they argued, and a vaccine remains the ultimate weapon.
Outside experts praised the paper even as they emphasised how much remained unknown.
"This is an excellent study that uses mathematical models to explore the dynamics of Covid-19 over a period of several years, in contrast to previously published studies that have focused on the coming weeks or months," Mark Woolhouse, an infectious disease epidemiologist at the University of Edinburgh said.
"It is important to recognise that it is a model; it is consistent with current data but is nonetheless based on a series of assumptions - for example about acquired immunity - that are yet to be confirmed."
Moral education needed in a 'rapidly changing world'
Moral education lessons for young people is needed in a rapidly changing world, the head of the programme said.
Alanood Al Kaabi, head of programmes at the Education Affairs Office of the Crown Price Court - Abu Dhabi, said: "The Crown Price Court is fully behind this initiative and have already seen the curriculum succeed in empowering young people and providing them with the necessary tools to succeed in building the future of the nation at all levels.
"Moral education touches on every aspect and subject that children engage in.
"It is not just limited to science or maths but it is involved in all subjects and it is helping children to adapt to integral moral practises.
"The moral education programme has been designed to develop children holistically in a world being rapidly transformed by technology and globalisation."
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10 tips for entry-level job seekers
- Have an up-to-date, professional LinkedIn profile. If you don’t have a LinkedIn account, set one up today. Avoid poor-quality profile pictures with distracting backgrounds. Include a professional summary and begin to grow your network.
- Keep track of the job trends in your sector through the news. Apply for job alerts at your dream organisations and the types of jobs you want – LinkedIn uses AI to share similar relevant jobs based on your selections.
- Double check that you’ve highlighted relevant skills on your resume and LinkedIn profile.
- For most entry-level jobs, your resume will first be filtered by an applicant tracking system for keywords. Look closely at the description of the job you are applying for and mirror the language as much as possible (while being honest and accurate about your skills and experience).
- Keep your CV professional and in a simple format – make sure you tailor your cover letter and application to the company and role.
- Go online and look for details on job specifications for your target position. Make a list of skills required and set yourself some learning goals to tick off all the necessary skills one by one.
- Don’t be afraid to reach outside your immediate friends and family to other acquaintances and let them know you are looking for new opportunities.
- Make sure you’ve set your LinkedIn profile to signal that you are “open to opportunities”. Also be sure to use LinkedIn to search for people who are still actively hiring by searching for those that have the headline “I’m hiring” or “We’re hiring” in their profile.
- Prepare for online interviews using mock interview tools. Even before landing interviews, it can be useful to start practising.
- Be professional and patient. Always be professional with whoever you are interacting with throughout your search process, this will be remembered. You need to be patient, dedicated and not give up on your search. Candidates need to make sure they are following up appropriately for roles they have applied.
Arda Atalay, head of Mena private sector at LinkedIn Talent Solutions, Rudy Bier, managing partner of Kinetic Business Solutions and Ben Kinerman Daltrey, co-founder of KinFitz
UAE currency: the story behind the money in your pockets
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Why are asylum seekers being housed in hotels?
The number of asylum applications in the UK has reached a new record high, driven by those illegally entering the country in small boats crossing the English Channel.
A total of 111,084 people applied for asylum in the UK in the year to June 2025, the highest number for any 12-month period since current records began in 2001.
Asylum seekers and their families can be housed in temporary accommodation while their claim is assessed.
The Home Office provides the accommodation, meaning asylum seekers cannot choose where they live.
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Cast: Loujain Adada, Zeina Khoury, Farhana Bodi, Ebraheem Al Samadi, Mona Kattan, and couples Safa & Fahad Siddiqui and DJ Bliss & Danya Mohammed
Rating: 1/5
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Sept 15: Bangladesh v Sri Lanka (Dubai)
Sept 16: Pakistan v Qualifier (Dubai)
Sept 17: Sri Lanka v Afghanistan (Abu Dhabi)
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Sept 19: India v Pakistan (Dubai)
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Sept 21: Group B Winner v Group A Runner-up (Abu Dhabi)
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Sept 23: Group B Winner v Group B Runner-up (Abu Dhabi)
Sept 25: Group A Winner v Group B Winner (Dubai)
Sept 26: Group A Runner-up v Group B Runner-up (Abu Dhabi)
Sept 28: Final (Dubai)
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7 — Michael Schumacher (1994, ’95, 2000, ’01 ’02, ’03, ’04)
7 — Lewis Hamilton (2008, ’14,’15, ’17, ’18, ’19, ’20)
5 — Juan Manuel Fangio (1951, ’54, ’55, ’56, ’57)
4 — Alain Prost (1985, ’86, ’89, ’93)
4 — Sebastian Vettel (2010, ’11, ’12, ’13)
