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New Delhi, Mar 14: Excise duty on petrol and diesel was on Saturday hiked by ₹3 per litre as the government looked to mop up gains arising from fall in international oil prices.

Special excise duty on petrol was hiked by ₹2 to ₹8 per litre incase of petrol and to Rs 4 incase of diesel, an official notification said.

Additionally, road cess on petrol was raised by ₹1 per litre each on petrol and diesel to ₹10.

The increase in excise duty would in normal course result in a hike in petrol and diesel prices but most of it would be adjusted against the fall in rates that would have necessitated because of slump in international oil prices.

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.

In a bid to help struggling small businesses in Covid-19 times, Facebook has introduced Shops to help set up a single online store for customers to access on both Facebook and Instagram.

While Facebook Shops is being rolled out from Wednesday, the company will introduce Instagram Shop, a new way to discover and buy products in Instagram Explore, this summer, starting in the US.

The social networking giant also announced that it will invest in features across its family of apps to inspire people to shop and make buying and selling online easier.

"Creating a Facebook Shop is free and simple. Businesses can choose the products they want to feature from their catalogue and then customise the look and feel of their shop with a cover image and accent colours that showcase their brand," Facebook said in a statement late Tuesday.

Any seller, no matter their size or budget, can bring their business online and connect with customers wherever and whenever it's convenient for them.

People can find Facebook Shops on a business' Facebook Page or Instagram profile, or discover them through stories or ads.

"From there, you can browse the full collection, save products you're interested in and place an order — either on the business' website or without leaving the app if the business has enabled checkout in the US," informed the company.

Last month, Facebook announced $40 million in grants for 10,000 small businesses in the US to help them get through these challenging time.

The grants will go to small businesses in 34 locations where Facebook employees live and work.

The company said that in Facebook Shops, users will be able to message a business through WhatsApp, Messenger or Instagram Direct to ask questions, get support, track deliveries and more.

In the future, they will be able to view a business' shop and make purchases right within a chat in WhatsApp, Messenger or Instagram Direct.

Later this year, Facebook will add a new shop tab in the navigation bar, so people can get to Instagram Shop in just one tap.

Facebook said it is making it easier to shop for products in real time.

Soon, sellers, brands and creators will be able to tag products from their Facebook Shop or catalogue before going live and those products will be shown at the bottom of the video so people can easily tap to learn more and purchase.

"We're starting to test this with businesses on Facebook and Instagram, and we'll roll it out more broadly in the coming months," said the company.

Facebook is also working with partners like Shopify, BigCommerce, WooCommerce, ChannelAdvisor, CedCommerce, Cafe24, Tienda Nube and Feedonomics to support small businesses.