Even those who have had Covid-19 should take precautions to avoid contracting it again, after a patient in the US became more seriously ill the second time, researchers said.
A 25-year-old man from Nevada developed a sore throat, cough, headache, nausea and diarrhoea after catching the virus in late March.
He fully recovered by April 27, but fell ill a second time in late May with similar symptoms that worsened.
All individuals, whether previously diagnosed with Covid-19 or not, should take identical precautions to avoid infection with SARS-CoV-2.
He was given emergency oxygen to treat breathing difficulty.
The patient, who was hospitalised during the second infection, did not have any underlying health conditions which put him at risk of developing more serious disease.
Scientists said his case, and others like it, prove it will not be possible to attain herd immunity through natural infection.
"Not only is this strategy lethal for many but also it is not effective," wrote Akiko Iwasaki, an immunologist at the Yale School of Medicine in The Lancet.
“Herd immunity requires safe and effective vaccines and robust vaccination implementation.”
Researchers at the University of Nevada said the US man’s reinfection was confirmed through analysis, which showed he had contracted two variants of the virus.
"Thus, previous exposure to SARS-CoV-2 might not guarantee total immunity in all cases," they wrote in The Lancet.
“All individuals, whether previously diagnosed with Covid-19 or not, should take identical precautions to avoid infection with SARS-CoV-2. The implications of reinfections could be relevant for vaccine development and application.”
There have now been several documented cases of Covid-19 reinfections around the world.
Of the four reinfections cases studied by researchers, symptoms were worse in two patients, suggesting no clear pattern.
Experts have said it could be because they were exposed to a larger dose of the virus the second time around.
But it could also be that the initial immune response worsened the symptoms during reinfection, in a phenomenon known as antibody dependent enhancement.
It was also seen in SARS, a close cousin of the new virus, in experiments.
It is not clear how often reinfections of Covid-19 occur. The phenomenon appears to be rare.
But some experts caution the number of asymptomatic reinfections are likely to be “severely underestimated”.
“Due to the paucity of broad testing and surveillance, we do not know how frequently reinfection occurs among individuals who recovered from their first infection,” wrote professor Iwasaki.
“Asymptomatic reinfection cases can only be picked up by routine community testing or at an airport, for example, and we are probably severely underestimating the number of asymptomatic reinfections.”
She said there is no evidence to suggest second reinfections are as result of "immune evasion" because of variants in the virus.
Studies have shown asymptomatic infections of Covid-19 tend to produce low, and in some cases, even undetectable antibodies, while those who suffer more symptoms mount a stronger immune response.
Higher antibodies appear to last longer. But it is still not known if the antibodies generated are protective.
Experts have said if SARS-Cov-2, which causes Covid-19, follows the same pattern as other coronaviruses, reinfections will become common.
Research has shown it is possible to catch a cold caused by the same strain months later as immunity fades quickly.
In one study from Kenya in 2018, almost 30 per cent of those who caught one variant of a coronavirus experienced a second reinfection. Around 10 per cent caught it a third time and one person was infected four times.
A number of reinfections occurred only three months after the first bout, and in multiple cases the viral load actually increased, "revealing ineffective protective immune responses after initial exposure".
Experts say vaccines generate immune responses in a different way to natural infections, and are expected to be protective.
Key facilities
- Olympic-size swimming pool with a split bulkhead for multi-use configurations, including water polo and 50m/25m training lanes
- Premier League-standard football pitch
- 400m Olympic running track
- NBA-spec basketball court with auditorium
- 600-seat auditorium
- Spaces for historical and cultural exploration
- An elevated football field that doubles as a helipad
- Specialist robotics and science laboratories
- AR and VR-enabled learning centres
- Disruption Lab and Research Centre for developing entrepreneurial skills
THE BIO: Mohammed Ashiq Ali
Proudest achievement: “I came to a new country and started this shop”
Favourite TV programme: the news
Favourite place in Dubai: Al Fahidi. “They started the metro in 2009 and I didn’t take it yet.”
Family: six sons in Dubai and a daughter in Faisalabad
Panipat
Director Ashutosh Gowariker
Produced Ashutosh Gowariker, Rohit Shelatkar, Reliance Entertainment
Cast Arjun Kapoor, Sanjay Dutt, Kriti Sanon, Mohnish Behl, Padmini Kolhapure, Zeenat Aman
Rating 3 /5 stars
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%3Cp%3E%3Cstrong%3EGold%3C%2Fstrong%3E%0D%3Cbr%3EMagomedomar%20Magomedomarov%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20%2B100kg%0D%3Cbr%3EKhaled%20Al%20Shehi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-62kg%0D%3Cbr%3EFaisal%20Al%20Ketbi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-85kg%0D%3Cbr%3EAsma%20Al%20Hosani%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-52kg%0D%3Cbr%3EShamma%20Al%20Kalbani%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-63kg%0D%3Cbr%3E%3Cstrong%3ESilver%3C%2Fstrong%3E%0D%3Cbr%3EOmar%20Al%20Marzooqi%20%E2%80%93%20Equestrian%20%E2%80%93%20Individual%20showjumping%0D%3Cbr%3EBishrelt%20Khorloodoi%20%E2%80%93%20Judo%20%E2%80%93%20Women%E2%80%99s%20-52kg%0D%3Cbr%3EKhalid%20Al%20Blooshi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-62kg%0D%3Cbr%3EMohamed%20Al%20Suwaidi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-69kg%0D%3Cbr%3EBalqees%20Abdulla%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-48kg%0D%3Cbr%3E%3Cstrong%3EBronze%3C%2Fstrong%3E%0D%3Cbr%3EHawraa%20Alajmi%20%E2%80%93%20Karate%20%E2%80%93%20Women%E2%80%99s%20kumite%20-50kg%0D%3Cbr%3EAhmed%20Al%20Mansoori%20%E2%80%93%20Cycling%20%E2%80%93%20Men%E2%80%99s%20omnium%0D%3Cbr%3EAbdullah%20Al%20Marri%20%E2%80%93%20Equestrian%20%E2%80%93%20Individual%20showjumping%0D%3Cbr%3ETeam%20UAE%20%E2%80%93%20Equestrian%20%E2%80%93%20Team%20showjumping%0D%3Cbr%3EDzhafar%20Kostoev%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20-100kg%0D%3Cbr%3ENarmandakh%20Bayanmunkh%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20-66kg%0D%3Cbr%3EGrigorian%20Aram%20%E2%80%93%20Judo%20%E2%80%93%20Men%E2%80%99s%20-90kg%0D%3Cbr%3EMahdi%20Al%20Awlaqi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-77kg%0D%3Cbr%3ESaeed%20Al%20Kubaisi%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Men%E2%80%99s%20-85kg%0D%3Cbr%3EShamsa%20Al%20Ameri%20%E2%80%93%20Jiu-jitsu%20%E2%80%93%20Women%E2%80%99s%20-57kg%0D%3C%2Fp%3E%0A
Company%20profile
%3Cp%3E%3Cstrong%3ECompany%20name%3A%3C%2Fstrong%3E%20Fasset%0D%3Cbr%3E%3Cstrong%3EStarted%3A%20%3C%2Fstrong%3E2019%0D%3Cbr%3E%3Cstrong%3EFounders%3A%3C%2Fstrong%3E%20Mohammad%20Raafi%20Hossain%2C%20Daniel%20Ahmed%0D%3Cbr%3E%3Cstrong%3EBased%3A%3C%2Fstrong%3E%20Dubai%0D%3Cbr%3E%3Cstrong%3ESector%3A%20%3C%2Fstrong%3EFinTech%0D%3Cbr%3E%3Cstrong%3EInitial%20investment%3A%3C%2Fstrong%3E%20%242.45%20million%0D%3Cbr%3E%3Cstrong%3ECurrent%20number%20of%20staff%3A%3C%2Fstrong%3E%2086%0D%3Cbr%3E%3Cstrong%3EInvestment%20stage%3A%3C%2Fstrong%3E%20Pre-series%20B%0D%3Cbr%3E%3Cstrong%3EInvestors%3A%3C%2Fstrong%3E%20Investcorp%2C%20Liberty%20City%20Ventures%2C%20Fatima%20Gobi%20Ventures%2C%20Primal%20Capital%2C%20Wealthwell%20Ventures%2C%20FHS%20Capital%2C%20VN2%20Capital%2C%20local%20family%20offices%3C%2Fp%3E%0A
Cricket World Cup League Two
Teams
Oman, UAE, Namibia
Al Amerat, Muscat
Results
Oman beat UAE by five wickets
UAE beat Namibia by eight runs
Namibia beat Oman by 52 runs
UAE beat Namibia by eight wickets
Fixtures
Saturday January 11 - UAE v Oman
Sunday January 12 – Oman v Namibia
Emiratisation at work
Emiratisation was introduced in the UAE more than 10 years ago
It aims to boost the number of citizens in the workforce particularly in the private sector.
Growing the number of Emiratis in the workplace will help the UAE reduce dependence on overseas workers
The Cabinet in December last year, approved a national fund for Emirati jobseekers and guaranteed citizens working in the private sector a comparable pension
President Sheikh Khalifa has described Emiratisation as “a true measure for success”.
During the UAE’s 48th National Day, Sheikh Khalifa named education, entrepreneurship, Emiratisation and space travel among cornerstones of national development
More than 80 per cent of Emiratis work in the federal or local government as per 2017 statistics
The Emiratisation programme includes the creation of 20,000 new jobs for UAE citizens
UAE citizens will be given priority in managerial positions in the government sphere
The purpose is to raise the contribution of UAE nationals in the job market and create a diverse workforce of citizens
The Specs
Engine 3.8-litre, twin-turbo V8
Transmission: eight-speed automatic
Power: 582bhp (542bhp in GTS model)
Torque: 730Nm
Price: Dh649,000 (Dh549,000 for GTS)
UAE currency: the story behind the money in your pockets
More on Quran memorisation:
Company profile
Date started: 2015
Founder: John Tsioris and Ioanna Angelidaki
Based: Dubai
Sector: Online grocery delivery
Staff: 200
Funding: Undisclosed, but investors include the Jabbar Internet Group and Venture Friends
Results
6.30pm: Dubai Millennium Stakes Group Three US$200,000 (Turf) 2,000m; Winner: Ghaiyyath, William Buick (jockey), Charlie Appleby (trainer).
7.05pm: Handicap $135,000 (T) 1,600m; Winner: Cliffs Of Capri, Tadhg O’Shea, Jamie Osborne.
7.40pm: UAE Oaks Group Three $250,000 (Dirt) 1,900m; Winner: Down On Da Bayou, Mickael Barzalona, Salem bin Ghadayer.
8.15pm: Zabeel Mile Group Two $250,000 (T) 1,600m; Winner: Zakouski, James Doyle, Charlie Appleby.
8.50pm: Meydan Sprint Group Two $250,000 (T) 1,000m; Winner: Waady, Jim Crowley, Doug Watson.
Western Region Asia Cup T20 Qualifier
Sun Feb 23 – Thu Feb 27, Al Amerat, Oman
The two finalists advance to the Asia qualifier in Malaysia in August
Group A
Bahrain, Maldives, Oman, Qatar
Group B
UAE, Iran, Kuwait, Saudi Arabia
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%3Cul%3E%0A%3Cli%3ECystic%20fibrosis%20is%20a%20genetic%20disorder%20that%20affects%20the%20lungs%2C%20pancreas%20and%20other%20organs.%3C%2Fli%3E%0A%3Cli%3EIt%20causes%20the%20production%20of%20thick%2C%20sticky%20mucus%20that%20can%20clog%20the%20airways%20and%20lead%20to%20severe%20respiratory%20and%20digestive%20problems.%3C%2Fli%3E%0A%3Cli%3EPatients%20with%20the%20condition%20are%20prone%20to%20lung%20infections%20and%20often%20suffer%20from%20chronic%20coughing%2C%20wheezing%20and%20shortness%20of%20breath.%3C%2Fli%3E%0A%3Cli%3ELife%20expectancy%20for%20sufferers%20of%20cystic%20fibrosis%20is%20now%20around%2050%20years.%3C%2Fli%3E%0A%3C%2Ful%3E%0A
if you go
The flights
Fly to Rome with Etihad (www.etihad.ae) or Emirates (www.emirates.com) from Dh2,480 return including taxes. The flight takes six hours. Fly from Rome to Trapani with Ryanair (www.ryanair.com) from Dh420 return including taxes. The flight takes one hour 10 minutes.
The hotels
The author recommends the following hotels for this itinerary. In Trapani, Ai Lumi (www.ailumi.it); in Marsala, Viacolvento (www.viacolventomarsala.it); and in Marsala Del Vallo, the Meliaresort Dimore Storiche (www.meliaresort.it).
Profile
Company: Justmop.com
Date started: December 2015
Founders: Kerem Kuyucu and Cagatay Ozcan
Sector: Technology and home services
Based: Jumeirah Lake Towers, Dubai
Size: 55 employees and 100,000 cleaning requests a month
Funding: The company’s investors include Collective Spark, Faith Capital Holding, Oak Capital, VentureFriends, and 500 Startups.
Winners
Best Men's Player of the Year: Kylian Mbappe (PSG)
Maradona Award for Best Goal Scorer of the Year: Robert Lewandowski (Bayern Munich)
TikTok Fans’ Player of the Year: Robert Lewandowski
Top Goal Scorer of All Time: Cristiano Ronaldo (Manchester United)
Best Women's Player of the Year: Alexia Putellas (Barcelona)
Best Men's Club of the Year: Chelsea
Best Women's Club of the Year: Barcelona
Best Defender of the Year: Leonardo Bonucci (Juventus/Italy)
Best Goalkeeper of the Year: Gianluigi Donnarumma (PSG/Italy)
Best Coach of the Year: Roberto Mancini (Italy)
Best National Team of the Year: Italy
Best Agent of the Year: Federico Pastorello
Best Sporting Director of the Year: Txiki Begiristain (Manchester City)
Player Career Award: Ronaldinho
The specs
Engine: 3.8-litre V6
Power: 295hp at 6,000rpm
Torque: 355Nm at 5,200rpm
Transmission: 8-speed auto
Fuel consumption: 10.7L/100km
Price: Dh179,999-plus
On sale: now
UAE currency: the story behind the money in your pockets
The specs
Engine: 3.8-litre twin-turbo V8
Power: 611bhp
Torque: 620Nm
Transmission: seven-speed automatic
Price: upon application
On sale: now
Company Profile:
Name: The Protein Bakeshop
Date of start: 2013
Founders: Rashi Chowdhary and Saad Umerani
Based: Dubai
Size, number of employees: 12
Funding/investors: $400,000 (2018)
The biog
Born: Kuwait in 1986
Family: She is the youngest of seven siblings
Time in the UAE: 10 years
Hobbies: audiobooks and fitness: she works out every day, enjoying kickboxing and basketball
Family reunited
Nazanin Zaghari-Ratcliffe was born and raised in Tehran and studied English literature before working as a translator in the relief effort for the Japanese International Co-operation Agency in 2003.
She moved to the International Federation of Red Cross and Red Crescent Societies before moving to the World Health Organisation as a communications officer.
She came to the UK in 2007 after securing a scholarship at London Metropolitan University to study a master's in communication management and met her future husband through mutual friends a month later.
The couple were married in August 2009 in Winchester and their daughter was born in June 2014.
She was held in her native country a year later.
Gothia Cup 2025
4,872 matches
1,942 teams
116 pitches
76 nations
26 UAE teams
15 Lebanese teams
2 Kuwaiti teams
UPI facts
More than 2.2 million Indian tourists arrived in UAE in 2023
More than 3.5 million Indians reside in UAE
Indian tourists can make purchases in UAE using rupee accounts in India through QR-code-based UPI real-time payment systems
Indian residents in UAE can use their non-resident NRO and NRE accounts held in Indian banks linked to a UAE mobile number for UPI transactions
What is type-1 diabetes
Type 1 diabetes is a genetic and unavoidable condition, rather than the lifestyle-related type 2 diabetes.
It occurs mostly in people under 40 and a result of the pancreas failing to produce enough insulin to regulate blood sugars.
Too much or too little blood sugar can result in an attack where sufferers lose consciousness in serious cases.
Being overweight or obese increases the chances of developing the more common type 2 diabetes.
2025 Fifa Club World Cup groups
Group A: Palmeiras, Porto, Al Ahly, Inter Miami.
Group B: Paris Saint-Germain, Atletico Madrid, Botafogo, Seattle.
Group C: Bayern Munich, Auckland City, Boca Juniors, Benfica.
Group D: Flamengo, ES Tunis, Chelsea, Leon.
Group E: River Plate, Urawa, Monterrey, Inter Milan.
Group F: Fluminense, Borussia Dortmund, Ulsan, Mamelodi Sundowns.
Group G: Manchester City, Wydad, Al Ain, Juventus.
Group H: Real Madrid, Al Hilal, Pachuca, Salzburg.
'How To Build A Boat'
Jonathan Gornall, Simon & Schuster
Our family matters legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
Name: Brendalle Belaza
From: Crossing Rubber, Philippines
Arrived in the UAE: 2007
Favourite place in Abu Dhabi: NYUAD campus
Favourite photography style: Street photography
Favourite book: Harry Potter
F1 The Movie
Starring: Brad Pitt, Damson Idris, Kerry Condon, Javier Bardem
Director: Joseph Kosinski
Rating: 4/5
