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Washington, Jun 30: Researchers in China have discovered a new type of swine flu that is capable of triggering a pandemic, according to a study published Monday in the US science journal PNAS.

Named G4, it is genetically descended from the H1N1 strain that caused a pandemic in 2009.

It possesses "all the essential hallmarks of being highly adapted to infect humans," say the authors, scientists at Chinese universities and China's Center for Disease Control and Prevention.

The researchers then carried out various experiments including on ferrets, which are widely used in flu studies because they experience similar symptoms to humans -- principally fever, coughing and sneezing. 

G4 was observed to be highly infectious, replicating in human cells and causing more serious symptoms in ferrets than other viruses.

Tests also showed that any immunity humans gain from exposure to seasonal flu does not provide protection from G4.

According to blood tests which showed up antibodies created by exposure to the virus, 10.4 percent of swine workers had already been infected.

The tests showed that as many as 4.4 percent of the general population also appeared to have been exposed.

The virus has therefore already passed from animals to humans but there is no evidence yet that it can be passed from human to human -- the scientists' main worry.

"It is of concern that human infection of G4 virus will further human adaptation and increase the risk of a human pandemic," the researchers wrote.

The authors called for urgent measures to monitor people working with pigs.

"The work comes as a salutary reminder that we are constantly at risk of new emergence of zoonotic pathogens and that farmed animals, with which humans have greater contact than with wildlife, may act as the source for important pandemic viruses," said James Wood, head of the department of veterinary medicine at Cambridge University.

A zoonotic infection is caused by a pathogen that has jumped from a non-human animal into a human.

Bengaluru, May 10 The asymptomatic and healthy people among international passengers will now have to undergo institutional quarantine for 14 days, according to the new standard operating procedure (SoP) issued by the Karnataka government for a third time.

The SoP, which has been revised twice, was issued by the Health and Family Welfare Department on Saturday, May 9.

The international passengers will be divided into two categories upon their arrival at the airports. Symptomatic will be directly sent to the covid-19 hospitals. Asymptomatic will not be allowed to go home directly. They will be sent for mandatory quarantine for 14 days in hotels and guest houses. 

Earlier, international passengers had to undergo seven days of institutional and seven days of home quarantine.

Passengers will also be tested only twice — once on arrival and for the second time on the 14th day — instead of the earlier decision to test thrice. They will be discharged from the facility if they test negative.

The first group of 350 people are expected to arrive from London at 3 am on Monday at the Kempegowda International Airport, said Lakshman Reddy, Joint Director, Social Welfare Department. 

Flights are expected from Singapore on May 13, Jeddah on May 14 and San Francisco on May 15. 

Among the stranded include 4,408 tourists and visitors, 3,084 students, 2,784 migrants and 557 ship crew.

Bengaluru, Jul 21: Students who are Covid-19 positive but are asymptomatic will be allowed to write the Common Entrance Test (CET) scheduled on July 30 and 31 for entrance into professional courses in Karnataka.

According to the Standard Operating Procedure (SOP) issued by the Department of Health and Family Welfare for CET, space should be allotted for students who have tested positive. Such students will have to be transported to and from the exam centre in an ambulance.

According to the SOP issued yesterday, candidates with COVID-19 “shall provide a risk consent certificate for taking up the exam.” The SOP also says “they shall inform about their status to the authorities concerned in advance to make the necessary arrangements.”