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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.

Mumbai, May 7: Maharashtra Minister Nawab Malik on Wednesday accused the BJP-led Uttar Pradesh and Karnataka governments of adopting an uncooperative approach in taking back migrant workers hailing from these two states.

Mr Malik said that such a problem has not arisen with other states like Bihar, Rajasthan and another BJP-ruled state, Madhya Pradesh.

"They are creating new hurdles. There are no such problems in case of other states like Bihar, Rajasthan, Madhya Pradesh and West Bengal though.

"The process (of sending back migrants) has been smooth in the case of these states," Mr Malik said.

The NCP leader alleged that the Uttar Pradesh and Karnataka governments either don't want the people hailing from their states to return or are deliberately creating hurdles so that out of job workers do not go back in big numbers.

The Uttar Pradesh and Karnataka government should understand that the migrant workers are not ready mentally to stay back in Maharashtra and want to return to their native states, Mr Malik said.

The NCP minister said the Maharashtra government has been sending the applications received from migrant workers to the nodal officers of their respective native districts.

Once the nodal officers (of the native districts) concerned approve the applications, the workers are sent back either by trains or private vehicles following their medical tests, Mr Malik added.