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Houston, Mar 15: Researchers, studying the novel coronavirus, have found that the time between cases in a chain of transmission is less than a week, and over 10 per cent of patients are infected by someone who has the virus, but does not show symptoms yet, a finding that may help public health officials contain the pandemic.

The study, published in the journal Emerging Infectious Diseases, estimated what's called the serial interval of the coronavirus by measuring the time it takes for symptoms to appear in two people with the virus -- the person who infects another, and the infected second person.

According to the researchers, including those from the University of Texas at Austin, the average serial interval for the novel coronavirus in China was approximately four days.

They said the speed of an epidemic depends on two things -- how many people each case infects, and how long it takes cases to spread.

The first quantity, the scientists said, is called the reproduction number, and the second is the serial interval.

Due to the short serial interval of the disease caused by the coronavirus -- COVID-19 -- they said, emerging outbreaks will grow quickly, and could be difficult to stop.

“Ebola, with a serial interval of several weeks, is much easier to contain than influenza, with a serial interval of only a few days,” said Lauren Ancel Meyers, study co-author from UT Austin.

Meyers explained that public health responders to Ebola outbreaks have much more time to identify and isolate cases before they infect others.

“The data suggest that this coronavirus may spread like the flu. That means we need to move quickly and aggressively to curb the emerging threat,” Meyers added.

In the study, the scientists examined more than 450 infection case reports from 93 cities in China, and found the strongest evidence yet that people without symptoms must be transmitting the virus -- known as pre-symptomatic transmission.

More than one in ten infections were from people who had the virus but did not yet feel sick, the scientists said.

While researchers across the globe had some uncertainty until now about asymptomatic transmission with the coronavirus, the new evidence could provide guidance to public health officials on how to contain the spread of the disease.

“This provides evidence that extensive control measures including isolation, quarantine, school closures, travel restrictions and cancellation of mass gatherings may be warranted,” Meyers said.

The researchers cautioned that asymptomatic transmission makes containment more difficult.

With hundreds of new cases emerging around the world every day, the scientists said, the data may offer a different picture over time.

They said infection case reports are based on people's memories of where they went and whom they had contact with, and if health officials move quickly to isolate patients, that may also skew the data.

“Our findings are corroborated by instances of silent transmission and rising case counts in hundreds of cities worldwide. This tells us that COVID-19 outbreaks can be elusive and require extreme measures,” Meyers said.

Beijing, May 9: Mounting a strong defence of the ruling Communist Party of China, President Xi Jinping has said the COVID-19 fight has once again shown that the CPC leadership and the country's socialist political system can overcome any challenge.

Xi's comments came as China faced global criticism for its initial inaction to act against the novel coronavirus, which according to Chinese officials emerged in the central Chinese city of Wuhan in December last year.

Pressure is also mounting on Beijing to agree for an international probe on the origins of the vicious virus, including from the Wuhan Institute of Virology (WIV), as claimed by the US leadership.

China curbed the spread of the coronavirus in over a month and brought COVID-19 under control at its first epicentre in Wuhan in about three months, Xi, also the General Secretary of the CPC, said at a symposium held on Friday to get suggestions from non-ruling Communist Party of China (CPC) parties on COVID-19 prevention and control.

He termed the curbing of the COVID-19 pandemic as "hard-won achievements" for the world's most populous country and the second-biggest economy.

The COVID-19 fight has once again shown that the CPC leadership, China's socialist system and its governance system can overcome any challenge and make big contributions to the progress of human civilisation, he said.

Xi said China had basically curbed the spread of the virus in over one month, managed to bring the daily number of new domestically-transmitted cases down to single digits in about two months, and secured decisive achievements in protecting epicentres Wuhan and Hubei province in about three months.

"For a huge country with 1.4 billion people, these are hard-won achievements," he said

Besides the top CPC officials, the symposium was attended by members of the central committees of non-CPC parties in China, the All-China Federation of Industry and Commerce, and persons without party affiliation.

The speakers at the symposium praised the Chinese leadership in handling the crisis, saying it fully demonstrated the political advantage of China's socialist system and showed that China was a major responsible country.

Xi, who is also the head of the People's Liberation Army, praised China's one-party political system governed by the CPC.

His comments on the country's political system came as Beijing is also defending the role of the CPC as US President Donald Trump and Secretary of State Mike Pompeo have blamed the ruling party for not being transparent in the fight against the pandemic.

Both Trump and Pompeo have been pressing Beijing to allow American experts for a probe on whether the virus emerged from the WIV, China's premier research lab where viruses of different types are reportedly researched.

At the symposium attended by the top CPC officials, Xi's leadership came for praise for successfully handling the situation, the state-run Xinhua news agency reported.

"Attendees noted the major strategic achievements in the COVID-19 fight under the strong leadership of the CPC Central Committee with Comrade Xi Jinping at the core," the report said.

The meeting was held amid reports of murmurs of internal criticism within the CPC about Xi's handling of the coronavirus crisis.

While China's move of handling the coronavirus from January 23 by locking down Hubei province and its capital Wuhan to prevent the spread of the virus and curbing it by deploying 42000 medical personnel has been praised, Beijing is criticised for its slow reaction after it emerged in December last year.

China used less than a week to identify the full genome sequence of the novel coronavirus and isolate the virus strain, produced various testing kits and swiftly selected a number of effective drugs and treatments. Different types of vaccines have also entered clinical trials.

President Xi said during the COVID-19 fight, China upheld the centralised and unified leadership of the CPC and concentrated the nation's best doctors, the most advanced equipment and the most needed resources to treat patients, with all treatment expenses covered by the state.

It managed to maximise the testing and cure rates while minimising the infection and fatality rates.

As of Friday, the COVID-19 death toll in China remained at 4,633 with no new fatalities reported for several days while the total number of cases stood at 82,887. In contrast, Chinese officials point out the death toll in the US which has crossed 75,000 with over 1.2 million cases, besides the mounting global toll.

Almost all countries in the world have been under lockdown for weeks to control the spread of the virus.

Xi called for mobilising the whole society, leveraging the institutional strength of concentrating resources to get things done and tapping the composite national strength as well as closely relying on science and technology.

On international cooperation, Xi said China had helped countries and international organisations to the best of its ability, demonstrating the nation's sense of responsibility as a major and responsible country.

Xi also stressed fixing the shortcomings in the country's major epidemic prevention and control mechanism and for the national public health system to raise the ability to deal with major public health emergencies.

He emphasised on targeted and effective measures to guard against the importation of cases and prevent a resurgence of the epidemic.

Washington, Jun 17: The United States is closely monitoring the situation following a fierce clash between Indian and Chinese forces in eastern Ladakh and hopes that the differences will be resolved peacefully, officials said here.

Twenty Indian Army personnel including a colonel were killed in the clash with Chinese troops in the Galwan Valley in eastern Ladakh on Monday night, the biggest military confrontation in over five decades that has significantly escalated the already volatile border standoff in the region.

"We are closely monitoring the situation between Indian and Chinese forces along the Line of Actual Control," a State Department spokesperson said.

"We note the Indian military has announced that 20 soldiers have died, and we offer our condolences to their families," the official said.

Both India and China have expressed their desires to de-escalate and the US supports a peaceful resolution of the current situation, the spokesperson said.

"During their phone call on June 2, 2020, President Donald Trump and Prime Minister Narendra Modi had discussed the situation along the India-China border," the official added.