London Daily

Focus on the big picture.
Friday, Oct 10, 2025

Coronavirus infects faster and lasts longer than Sars, raising new containment challenges, Chinese studies suggest

Researchers found that on average, infected people expel virus particles from their bodies for a relatively long period of 20 days, even before symptoms appear. Findings indicate longer quarantine periods may be needed for patients, according to researchers from the China-Japan Friendship Hospital

A series of studies of the coronavirus suggest it is infectious for longer periods than pathogens from the same family, such as Sars, presenting added challenges for containing it.

Researchers found that on average, people with SARS-CoV-2 – the virus that causes Covid-19, a pneumonia-like disease – can expel or “shed” virus particles from their bodies for a relatively long period of 20 days, spreading it even before symptoms appear.

The virus also remains persistent in the faeces of some children, suggesting it can be transmitted through a faecal-oral transmission route – meaning that contaminated faeces from the infected child is somehow ingested by another person.

This indicates longer quarantine periods may be needed for patients, according to a study by a team from the China-Japan Friendship Hospital, which included China National Health Commission expert Cao Bin.

The more contagious nature of the virus as indicated in the study is reflected in the growing number of cases globally: as of Thursday, Covid-19 had infected over 200,000 people in more than 172 countries and regions, and killed nearly 9,000.

The research included 191 patients in Wuhan, 137 of which were discharged and 54 had died in hospital by January 31. For patients who received antiviral treatment, the medication did not reduce the duration of viral shedding, according to the paper published in medical journal The Lancet.

“A period of 20 days completely exceeds the expected viral shedding duration for acute respiratory virus infections,” Cao Bin said in an interview with Caixin magazine on March 11. “The relatively longer viral shedding duration means longer antiviral treatment time and quarantine period are needed.”

The paper said there were limitations to the study, although it was reportedly the largest retrospective analysis of Covid-19 patients who have experienced a definitive outcome.

Another study observed the highest viral load in throat swabs at the initial sign of symptoms, inferring that infectiousness peaked on or before symptom onset, according to researchers from Guangzhou and the University of Hong Kong. That finding was published in a so-called preprint paper, or one which has not been peer-reviewed.



Researchers estimated that 44 per cent of the transmissions could occur before an infected person displayed symptoms. This pattern bore a greater similarity to the transmission of influenza than Sars, the study suggested.

The preprint research, which involved 94 patients in Guangzhou, said containing the virus was made more difficult by the high rate of transmissions occurring before symptoms were evident. Mitigation measures such as social distancing may be more effective, it said.

“Contact tracing and isolation alone are less likely to be successful if more than 30 per cent of transmission occurred before symptom onset,” the paper said.

“With a substantial proportion of pre-symptomatic transmission, measures such as enhanced personal hygiene among the general population and social distancing would likely be the key instruments for disease control in the community.”

In another paper published by the journal Nature Medicine last week, Guangzhou researchers studied 10 children aged 2 months to 15 years old and found that eight of them persistently tested positive for the virus on rectal swabs after nasal samples had returned negative results.

“[This] suggests that the gastrointestinal tract may shed virus and faecal – oral transmission may be possible,” the study said.
“These findings also suggest that rectal swab-testing may be more useful than nasopharyngeal swab-testing (in the area behind the nose and mouth that connects to the oesophagus) in judging the effectiveness of treatment and determining the timing of termination of quarantine.”

Newsletter

Related Articles

0:00
0:00
Close
California County Reinstates Mask Mandate in Health Facilities as Respiratory Illness Risk Rises
Israel and Hamas Agree to First Phase of Trump-Brokered Gaza Truce, Hostages to Be Freed
French Political Turmoil Elevates Marine Le Pen as Rassemblement National Poised for Power
China Unveils Sweeping Rare Earth Export Controls to Shield ‘National Security’
The Davos Set in Decline: Why the World Economic Forum’s Power Must Be Challenged
France: Less Than a Month After His Appointment, the New French Prime Minister Resigns
Hungarian Prime Minister Viktor Orbán stated that Hungary will not adopt the euro because the European Union is falling apart.
Sarah Mullally Becomes First Woman Appointed Archbishop of Canterbury
Mayor in western Germany in intensive care after stabbing
Australian government pays Deloitte nearly half a million dollars for a report built on fabricated quotes, fake citations, and AI-generated nonsense.
US Prosecutors Gained Legal Approval to Hack Telegram Servers
Macron Faces Intensifying Pressure to Resign or Trigger New Elections Amid France’s Political Turmoil
Standard Chartered Names Roberto Hoornweg as Sole Head of Corporate & Investment Banking
UK Asylum Housing Firm Faces Backlash Over £187 Million Profits and Poor Living Conditions
UK Police Crack Major Gang in Smuggling of up to 40,000 Stolen Phones to China
BYD’s UK Sales Soar Nearly Nine-Fold, Making Britain Its Biggest Market Outside China
Trump Proposes Farm Bailout from Tariff Revenues Amid Backlash from Other Industries
FIFA Accuses Malaysia of Forging Citizenship Documents, Suspends Seven Footballers
Latvia to Bar Tourist and Occasional Buses to Russia and Belarus Until 2026
A Dollar Coin Featuring Trump’s Portrait Expected to Be Issued Next Year
Australia Orders X to Block Murder Videos, Citing Online Safety and Public Exposure
Three Scientists Awarded Nobel Prize in Medicine for Discovery of Immune Self-Tolerance Mechanism
OpenAI and AMD Forge Landmark AI-Chip Alliance with Equity Option
Munich Airport Reopens After Second Drone Shutdown
France Names New Government Amid Political Crisis
Trump Stands Firm in Shutdown Showdown and Declares War on Drug Cartels — Turning Crisis into Opportunity
Surge of U.S. Billionaires Transforms London’s Peninsula Apartments into Ultra-Luxury Stronghold
Pro Europe and Anti-War Babiš Poised to Return to Power After Czech Parliamentary Vote
Jeff Bezos Calls AI Surge a ‘Good’ Bubble, Urges Focus on Lasting Innovation
Japan’s Ruling Party Chooses Sanae Takaichi, Clearing Path to First Female Prime Minister
Sean ‘Diddy’ Combs Sentenced to Fifty Months in Prison Following Prostitution Conviction
Taylor Swift’s ‘Showgirl’ Launch Extends Billion-Dollar Empire
Trump Administration Launches “TrumpRx” Plan to Enable Direct Drug Sales at Deep Discounts
Trump Announces Intention to Impose 100 Percent Tariff on Foreign-Made Films
Altman Says GPT-5 Already Outpaces Him, Warns AI Could Automate 40% of Work
Singapore and Hong Kong Vie to Dominate Asia’s Rising Gold Trade
Trump Organization Teams with Saudi Developer on $1 Billion Trump Plaza in Jeddah
Manhattan Sees Surge in Office-to-Housing Conversions, Highest Since 2008
Switzerland and U.S. Issue Joint Assurance Against Currency Manipulation
Electronic Arts to Be Taken Private in Historic $55 Billion Buyout
Thomas Jacob Sanford Named as Suspect in Deadly Michigan Church Shooting and Arson
Russian Research Vessel 'Yantar' Tracked Mapping Europe’s Subsea Cables, Raising Security Alarms
New York Man Arrested After On-Air Confession to 2017 Parents’ Murders
U.S. Defense Chief Orders Sudden Summit of Hundreds of Generals and Admirals
Global Cruise Industry Posts Dramatic Comeback with 34.6 Million Passengers in 2024
Trump Claims FBI Planted 274 Agents at Capitol Riot, Citing Unverified Reports
India: Internet Suspended in Bareilly Amid Communal Clashes Between Muslims and Hindus
Supreme Court Extends Freeze on Nearly $5 Billion in U.S. Foreign Aid at Trump’s Request
Archaeologists Recover Statues and Temples from 2,000-Year-Old Sunken City off Alexandria
China Deploys 2,000 Workers to Spain to Build Major EV Battery Factory, Raising European Dependence
×