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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, July 25: A 105-year-old person from Bengaluru’s Basaveshwar Nagar, who was under treatment for covid-19 at a hospital for past five days, breathed his last today. He was a former government account who retired in 1973. He was the oldest known covid-19 patient in the state so far.

Many members of the patient's family are said to be infected and are hospitalised at various facilities. The funeral will be overseen by two uninfected family members.

The patient 74411 died on Saturday morning at around 9 a.m., said Dr Prasanna, Managing Director of Pristine Hospital And Research Centre where the former was admitted.

“The patient was initially doing well when he admitted on July 20. He did not have significant lung changes when he was admitted. However, after three days, his blood pressure started to drop so he was put on oxygen in the ICU. Yesterday morning, with continued deterioration, he was placed on non-invasive ventilator support,” Dr Prasanna said.

“Finally, by last night, his oxygen saturation levels began to plummet abruptly and we had to intubate him for ventilator support. His condition continued to deteriorate, however. The cause of death was respiratory failure and the onset of sepsis,” he added.

Although earmarked for supplies of Remdesivir by the government, the hospital did not receive the drugs. An appeal to Dr K Sudhakar, Minister of Medical Education by the hospital staff resulted in an assurance that the medication would arrive. “However, in the end, we had to source the medication ourselves on Friday,” medical staff said.

Dr Thrilok Chandra, Head, Critical Care Support Unit (CCSU), which oversees the care of critical or vulnerable-aged Covid-19 patients, had said that Patient 74411 had been diagnosed early. “He was identified when the disease was still in the early stages in his body. He only had symptoms of Influenza-Like Illness (ILI), so the symptoms were not severe,” Dr Chandra had said.

“It’s very sad. We were rooting for him to pull through. He had no comorbidities at all. He had been bed-ridden from last year, but he was healthy. His only potential comorbidity was his advanced age,” Dr Prasanna said.

According to government data, 34% of Covid-19 fatalities in India are aged between 60 and 74 years of age. Fourteen per cent are aged above 74.