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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.

Kolkata, Mar 1: The Calcutta High Court has ruled that it is not mandatory for foreigners to produce a valid passport and its particulars for processing of application for grant of Indian citizenship if he is able to satisfy the appropriate authorities the reasons for non-availability of the document.

Justice Sabysachi Bhattacharya passed the order while disposing off a petition by granting the petitioner liberty to file an application before the authority "as contemplated in Rule 11 of the Citizenship Rules 2009, upon furnishing explanation as to the non-availability of the passport".

Bismillah Khan had filed the petition saying he was being denied the citizenship of India because of his inability to file an application under Section 5 (1) (c) of the Citizenship Act, 1955, apparently due to the mandatory requirement of furnishing a copy of the passport for such application.

The petitioner's counsel submitted that Khan was a Pakhtoon citizen and due to political turmoil in the said state, which subsequently merged partially into Afghanistan and partially into Pakistan, he, as a five-year old, had to migrate to India with his father in 1973.

Under such circumstances, the petitioner could not have any opportunity of having a valid passport, since they were refugees under distress, the counsel said.

The petitioner had previously approached a coordinate Bench of the court, wherein a single judge, passed an order on July 25, 2018, directing him to comply with the formalities required, as communicated by the secretary to the Government of India to the Secretary to the Government of West Bengal (Home), vide a letter dated December 7, 2017.

The court had then also given liberty to the petitioner to apply afresh before the appropriate authority under Section 5(1)(c) of the 1955 Act, having complied with all the formalities.

The petitioner then moved Bhattacharya's court submitting that a complete application as directed by the Coordinate Bench cannot be possibly filed by his client due to the mandatory requirement of uploading a copy of his passport, which the petitioner does not have due to reasons beyond his control.

The counsel said Khan is married to an Indian citizen, has a daughter and living in India for close to half a century.

The counsel for the union of India submitted that in view of no application having been filed by the petitioner, there is no scope of granting such proposed application at the present juncture for the Union.

The counsel argued that it is mandatory to file an application in Form III for the application of the petitioner under Section 5(1)(c) of the Act to be considered at all.

In view of the petitioner not complying with the mandatory requirement of submitting a copy of his passport, the state government cannot, under the law, forward such application to the union government.

After hearing all sides, Justice Bhattacharya said although the rule "contemplates that an application shall not be entertained unless the application is made in Form III, such provision ipso facto does not make the availability of a passport a mandatory requirement".

"..the Form given with the Rules or the Rules themselves cannot override the provision of the statute itself, under which the said Rules are framed, which does not stipulate such a mandate on the applicants for citizenship under Section 5 (1)(c) of the 1955 Act mandatorily to carry a passport".

The court said although such provision is included in the Form, which has to be complied with by the applicant, "it is nowhere indicated in such Form that all the relevant particulars, including the particulars regarding passport of the petitioner have to be furnished mandatorily, along with a copy of a valid foreign passport, even in the event the petitioner, for valid reasons, is not in a position to produce such passport".

Justice Bhattacharya ruled that under such circumstances, it cannot be held that the provision of producing a passport and its particulars is mandatory in nature and there has to be a relaxation in such requirement "in case the petitioner is able to satisfy the appropriate authorities the reasons for non- availability of such passport".

"Unless such a leeway is given to the applicants, genuine persons who otherwise have all the formal documents indicating that they have been residing in India for a long time and have married a resident of India would also be unable to apply for Indian Citizenship despite having lived their entire lives and contributed to the economy and diverse culture of this country."

He said such a scenario would be contradictory to the spirit of Article 14 of the Constitution of India.

"In such view of the matter, the requirement of having a passport has to be read as optional in Form III of the Citizenship Rules, 2009 and the authorities are deemed to have the power to relax such 6 requirement in the event the applicant satisfied the authorities for genuine reasons why the applicant is not in a position to produce such passport," the February 24 order said.

The court ruled that despite the provision of making applications online, a provision has to be made for persons who do not have all the particulars of their passport, which is read as optional, to file applications manually, which are to be treated as valid applications under Rule 5 of the Citizenship Rules, 2009.

The court also ordered that alternatively the necessary software be amended so that the online applications can be presented with or without passports, in the latter case furnishing detailed reasons as to non-furnishing of passports.

"Sanctioning of such forms, however, will be conditional upon the satisfaction of the relevant authorities about the reasons for the applicant not being able to produce her/his passport," the order said.