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Toronto, May 7: Scientists have uncovered how bats can carry the MERS coronavirus without getting sick, shedding light on what triggers coronaviruses, including the one behind the COVID-19 pandemic, to jump to humans.

According to the study, published in the journal Scientific Reports, coronaviruses like the Middle East respiratory syndrome (MERS) virus, and the COVID19-causing SARS-CoV-2 virus, are thought to have originated in bats.

While these viruses can cause serious, and often fatal disease in people, bats seem unharmed, the researchers, including those from the University of Saskatchewan (USask) in Canada, said.

"The bats don't get rid of the virus and yet don't get sick. We wanted to understand why the MERS virus doesn't shut down the bat immune responses as it does in humans," said USask microbiologist Vikram Misra.

In the study, the scientists demonstrated that cells from an insect-eating brown bat can be persistently infected with MERS coronavirus for months, due to important adaptations from both the bat and the virus working together.

"Instead of killing bat cells as the virus does with human cells, the MERS coronavirus enters a long-term relationship with the host, maintained by the bat's unique 'super' immune system," said Misra, one of the study's co-authors.

"SARS-CoV-2 is thought to operate in the same way," he added.

Stresses on bats, such as wet markets, other diseases, and habitat loss, may have a role in coronavirus spilling over to other species, the study noted.

"When a bat experiences stress to their immune system, it disrupts this immune system-virus balance and allows the virus to multiply," Misra said.

The scientists, involved in the study, had earlier developed a potential treatment for MERS-CoV, and are currently working towards a vaccine against COVID-19.

While camels are the known intermediate hosts of MERS-CoV, they said bats are suspected to be the ancestral host.

There is no vaccine for either SARS-CoV-2 or MERS, the researchers noted.

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"We see that the MERS coronavirus can very quickly adapt itself to a particular niche, and although we do not completely understand what is going on, this demonstrates how coronaviruses are able to jump from species to species so effortlessly," said USask scientist Darryl Falzarano, who co-led the study.

According to Misra, coronaviruses rapidly adapt to the species they infect, but little is known on the molecular interactions of these viruses with their natural bat hosts.

An earlier study had shown that bat coronaviruses can persist in their natural bat host for at least four months of hibernation.

When exposed to the MERS virus, the researchers said, bat cells adapt, not by producing inflammation-causing proteins that are hallmarks of getting sick, but instead by maintaining a natural antiviral response.

On the contrary, they said this function shuts down in other species, including humans.

The MERS virus, the researchers said, also adapts to the bat host cells by very rapidly mutating one specific gene.

These adaptations, according to the study, result in the virus remaining long-term in the bat, but being rendered harmless until something like a disease, or other stressors, upsets this balance.

In future experiments, the scientists hope to understand how the bat-borne MERS virus adapts to infection and replication in human cells.

"This information may be critical for predicting the next bat virus that will cause a pandemic," Misra said.

Lucknow, Mar 5: Uttar Pradesh chief minister Yogi Adityanath said last night that the role of teachers would come under the scanner when "anti-India" slogans are raised at universities and institutions of higher education.

"When anti-India slogans are raised at institutions of higher education, we should be prepared to ask why this type of distortion occurrs among our students?" he said at a programme organised by the Basic Shiksha Parishad in Lucknow.

"We begin our work with pledge for the country's unity and integrity and today slogans are raised for the division of the nation. In such a situation, questions are raised over the role of teachers who are considered equal to god in society," he said.

"Who all are involved in this sin and chaos? Governments can provide resources, but the one who has given them basic education, who has given them secondary education and who has led them to that place, all of them should evaluate their actions today," the chief minister said.

Speaking about the condition of education in the state when his government came to power three years ago, he said there was an atmosphere of chaos and anarchy in the state and the condition of basic education was very bad.

"The worst problem was that of proxy teachers. Our government started the process of prohibiting proxy teachers in the first phase," he said.

Adityanath said that a teacher is not just a government servant, but the fate of the nation. He said teachers should learn from Chanakya.

Had Chanakya confined himself to Nalanda University, he would not have been able to make India a superpower of the world during that period. Teachers will have to prepare themselves according to the challenges and need of society, he added.

New Delhi, Jul 21: Prime Minister Narendra Modi and President Ram Nath Kovind on Tuesday condoled the demise of Madhya Pradesh Governor Lalji Tandon.

Tandon, 85, passed away at 5:35 am on Tuesday after a prolonged illness.

Taking to Twitter, Prime Minister Modi posted a picture with Madhya Pradesh Governor and wrote, "Shri Lalji Tandon will be remembered for his untiring efforts to serve society. He played a key role in strengthening the BJP in Uttar Pradesh. He made a mark as an effective administrator, always giving importance of public welfare. Anguished by his passing away."
"Shri Lalji Tandon was well-versed with constitutional matters. He enjoyed a long and close association with beloved Atal Ji. In this hour of grief, my condolences to the family and well-wishers of Shri Tandon. Om Shanti," he added.

President Kovind expressed condolences saying that we have lost a legendary leader today.

"In the passing away of Madhya Pradesh Governor Shri Lal Ji Tandon, we have lost a legendary leader who combined cultural sophistication of Lucknow and acumen of a national stalwart. I deeply mourn his death. My heartfelt condolences to his family and friends," he tweeted.

His last rites will be performed at Gulala Ghat in Lucknow at 4:30 pm today.

Tandon was admitted to a hospital after complaining of breathing problems, difficulty in urination and fever. He has been undergoing treatment since June 11.