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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.

Tehran, Mar 15: Two hundred and thirty-four Indians stranded in coronavirus-hit Iran have arrived in India, External Affairs Minister S Jaishankar said on Sunday.

The batch comprises 131 students and 103 pilgrims, he said.

“234 Indians stranded in Iran have arrived in India; including 131 students and 103 pilgrims. Thank you Ambassador Dhamu Gaddam and @India_in_Iran team for your efforts. Thank Iranian authorities,” Jaishankar tweeted.

The third batch of Indians from Iran arrived early Sunday. A second batch of 44 Indian pilgrims had arrived from Iran on Friday.

Iran is one of the worst-affected countries by the coronavirus outbreak and the government has been working on plans to bring back Indians stranded there.

The first batch of 58 Indian pilgrims were brought back from Iran on Tuesday.

Moscow, Jun 27: The number of people who have contracted the coronavirus infection in Russia has increased by 6,852 over the past day to a total of 627,646, the country's COVID-19 Response Center said in a daily update on Saturday.

"Over the past day, 6,852 new COVID-19 cases were confirmed in 85 regions of Russia, including 2,058, or 30 per cent, of asymptomatic cases," the response centre said.

Of the total 6,852 newly detected cases, 750 have been confirmed in Moscow, 366 in Moscow Region, and 280 in the Khanty-Mansi Autonomous Area, according to the report.

The reported daily dynamics included 188 new fatalities, which brought the cumulative death toll to 8,969.

Total recoveries now count 393,352, an increase of 9,200 over the past day, including 1,852 in Moscow, 1,421 in Moscow Region and 716 in St. Petersburg.