Covid antibodies remain strong up to nine months after infection, regardless of whether a person had symptoms, a new study has found.
Almost an entire Italian town was tested by researchers from the University of Padua and Imperial College London to check how long antibodies last.
More than 85 per cent of the 3,000 residents of Vo', Italy, in February and March 2020 were tested for Ovid-19 infection, then tested again in May and November 2020 for antibodies against the virus.
The team found that 98.8 per cent of infected people showed detectable levels of antibodies up to nine months later. There was no difference between people who had suffered Covid symptoms and those who were symptom-free. The results were published on Monday in Nature Communications.
Previous studies suggested immunity lasts around six months, meaning it is possible to catch Covid twice. Being vaccinated reduces the likelihood of infection and douses symptoms but does not necessarily prevent falling ill.
The researchers previously found that mass testing and quarantining in Vo’ – which experienced the first known Covid-19 death in Italy – enabled the community to suppress the virus in only a few weeks. The town went into quarantine immediately after the death on February 21, 2020 and locking down the area and implementing a test and trace system “substantially reduced transmission”.
In the latest study the team found cases of antibody levels increasing in some people, suggesting potential reinfection with the virus, providing a boost to the immune system.
"We found no evidence that antibody levels between symptomatic and asymptomatic infections differ significantly, suggesting that the strength of the immune response does not depend on the symptoms and the severity of the infection," lead author Dr Ilaria Dorigatti, of Imperial College said.
"However, our study does show that antibody levels vary, sometimes markedly, depending on the test used. This means that caution is needed when comparing estimates of infection levels in a population obtained in different parts of the world with different tests and at different times."
Prof Enrico Lavezzo, from the University of Padua, said: "The May testing demonstrated that 3.5 per cent of the Vo' population had been exposed to the virus, even though not all of these subjects were aware of their exposure given the large fraction of asymptomatic infections.
"However, at the follow-up, which was performed roughly nine months after the outbreak, we found that antibodies were less abundant, so we need to continue to monitor antibody persistence for longer time spans."
The team found that there was a 25 per cent probability that a person would pass the infection to a family member and that most transmission (79 per cent) was caused by 20 per cent of infections.
The large differences in how one infected person may infect others suggests that behavioural factors are vital for epidemic control and physical distancing, as well as limiting the number of social contacts and mask-wearing, continue to be important to reduce the risk of transmitting the disease, even in highly vaccinated populations.
Pharaoh's curse
British aristocrat Lord Carnarvon, who funded the expedition to find the Tutankhamun tomb, died in a Cairo hotel four months after the crypt was opened.
He had been in poor health for many years after a car crash, and a mosquito bite made worse by a shaving cut led to blood poisoning and pneumonia.
Reports at the time said Lord Carnarvon suffered from “pain as the inflammation affected the nasal passages and eyes”.
Decades later, scientists contended he had died of aspergillosis after inhaling spores of the fungus aspergillus in the tomb, which can lie dormant for months. The fact several others who entered were also found dead withiin a short time led to the myth of the curse.
Tearful appearance
Chancellor Rachel Reeves set markets on edge as she appeared visibly distraught in parliament on Wednesday.
Legislative setbacks for the government have blown a new hole in the budgetary calculations at a time when the deficit is stubbornly large and the economy is struggling to grow.
She appeared with Keir Starmer on Thursday and the pair embraced, but he had failed to give her his backing as she cried a day earlier.
A spokesman said her upset demeanour was due to a personal matter.
David Haye record
Total fights: 32
Wins: 28
Wins by KO: 26
Losses: 4
The UAE's journey to space
Labour dispute
The insured employee may still file an ILOE claim even if a labour dispute is ongoing post termination, but the insurer may suspend or reject payment, until the courts resolve the dispute, especially if the reason for termination is contested. The outcome of the labour court proceedings can directly affect eligibility.
- Abdullah Ishnaneh, Partner, BSA Law
Read more from Mina Al-Oraibi
Company%C2%A0profile
%3Cp%3ECompany%3A%20Zywa%3Cbr%3EStarted%3A%202021%3Cbr%3EFounders%3A%20Nuha%20Hashem%20and%20Alok%20Kumar%3Cbr%3EBased%3A%20UAE%3Cbr%3EIndustry%3A%20FinTech%3Cbr%3EFunding%20size%3A%20%243m%3Cbr%3ECompany%20valuation%3A%20%2430m%3C%2Fp%3E%0A
The specs
- Engine: 3.9-litre twin-turbo V8
- Power: 640hp
- Torque: 760nm
- On sale: 2026
- Price: Not announced yet
Mobile phone packages comparison
Killing of Qassem Suleimani
Killing of Qassem Suleimani
'The Ice Road'
Director: Jonathan Hensleigh
Stars: Liam Neeson, Amber Midthunder, Laurence Fishburne
2/5
UAE currency: the story behind the money in your pockets
Jetour T1 specs
Engine: 2-litre turbocharged
Power: 254hp
Torque: 390Nm
Price: From Dh126,000
Available: Now
COMPANY PROFILE
Name: Rain Management
Year started: 2017
Based: Bahrain
Employees: 100-120
Amount raised: $2.5m from BitMex Ventures and Blockwater. Another $6m raised from MEVP, Coinbase, Vision Ventures, CMT, Jimco and DIFC Fintech Fund
ABU%20DHABI'S%20KEY%20TOURISM%20GOALS%3A%20BY%20THE%20NUMBERS
%3Cp%3EBy%202030%2C%20Abu%20Dhabi%20aims%20to%20achieve%3A%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3E%E2%80%A2%2039.3%20million%20visitors%2C%3C%2Fstrong%3E%20nearly%2064%25%20up%20from%202023%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3E%E2%80%A2%20Dh90%20billion%20contribution%20to%20GDP%2C%3C%2Fstrong%3E%20about%2084%25%20more%20than%20Dh49%20billion%20in%202023%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3E%E2%80%A2%20178%2C000%20new%20jobs%2C%3C%2Fstrong%3E%20bringing%20the%20total%20to%20about%20366%2C000%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3E%E2%80%A2%2052%2C000%20hotel%20rooms%2C%3C%2Fstrong%3E%20up%2053%25%20from%2034%2C000%20in%202023%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3E%E2%80%A2%207.2%20million%20international%20visitors%2C%3C%2Fstrong%3E%20almost%2090%25%20higher%20compared%20to%202023's%203.8%20million%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3E%E2%80%A2%203.9%20international%20overnight%20hotel%20stays%2C%3C%2Fstrong%3E%2022%25%20more%20from%203.2%20nights%20in%202023%3C%2Fp%3E%0A
Company%20Profile
%3Cp%3E%3Cstrong%3ECompany%20name%3A%3C%2Fstrong%3E%20myZoi%3Cbr%3E%3Cstrong%3EStarted%3A%3C%2Fstrong%3E%202021%3Cbr%3E%3Cstrong%3EFounders%3A%3C%2Fstrong%3E%20Syed%20Ali%2C%20Christian%20Buchholz%2C%20Shanawaz%20Rouf%2C%20Arsalan%20Siddiqui%2C%20Nabid%20Hassan%3Cbr%3E%3Cstrong%3EBased%3A%3C%2Fstrong%3E%20UAE%3Cbr%3E%3Cstrong%3ENumber%20of%20staff%3A%3C%2Fstrong%3E%2037%3Cbr%3E%3Cstrong%3EInvestment%3A%3C%2Fstrong%3E%20Initial%20undisclosed%20funding%20from%20SC%20Ventures%3B%20second%20round%20of%20funding%20totalling%20%2414%20million%20from%20a%20consortium%20of%20SBI%2C%20a%20Japanese%20VC%20firm%2C%20and%20SC%20Venture%3C%2Fp%3E%0A
Read more about the coronavirus
What can victims do?
Always use only regulated platforms
Stop all transactions and communication on suspicion
Save all evidence (screenshots, chat logs, transaction IDs)
Report to local authorities
Warn others to prevent further harm
Courtesy: Crystal Intelligence
Youth YouTuber Programme
The programme will be presented over two weeks and will cover the following topics:
- Learning, scripting, storytelling and basic shots
- Master on-camera presence and advanced script writing
- Beating the algorithm and reaching your core audience
In numbers: China in Dubai
The number of Chinese people living in Dubai: An estimated 200,000
Number of Chinese people in International City: Almost 50,000
Daily visitors to Dragon Mart in 2018/19: 120,000
Daily visitors to Dragon Mart in 2010: 20,000
Percentage increase in visitors in eight years: 500 per cent
