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Melbourne, Jul 24: Home-made cloth face masks may need a minimum of two layers, and preferably three, to prevent the dispersal of viral droplets associated with Covid-19, according to a study.

Researchers, including those from the University of New South Wales in Australia, noted that viral droplets are generated by those infected with the novel coronavirus when they cough, sneeze, or speak.

As face masks have been proven to protect healthy people from inhaling infectious droplets as well as reducing the spread from those who are already infected, several types of material have been suggested for these, but based on little or no evidence of how well they work, the scientists said.

In the current study, published in the journal Thorax, the researchers compared the effectiveness of single and double-layer cloth face coverings with a surgical face mask (Bao Thach) at reducing droplet spread.

They said the single layer covering was made from a folded piece of cotton T shirt and hair ties, and the double layer covering was made using the sew method described by the US Centers for Disease Control and Prevention (CDC).

The scientists used a tailored LED lighting system and a high-speed camera to film the dispersal of airborne droplets produced by a healthy person with no respiratory infection, during speaking, coughing, and sneezing while wearing each type of mask.

Their analysis showed that the surgical face mask was the most effective at reducing airborne droplet dispersal, although even a single layer cloth face covering reduced the droplet spread from speaking.

But the study noted that a double layer covering was better than a single layer in reducing the droplet spread from coughing and sneezing.

According to the researchers, the effectiveness of cloth face masks is dependent on the number of layers of the covering, the type of material used, design, fit as well as the frequency of washing.

Based on their observations, they said a home made cloth mask with at least two layers is preferable to a single layer mask.

"Guidelines on home-made cloth masks should stipulate multiple layers," the scientists said, adding that there is a need for more research to inform safer cloth mask design.

New Delhi, Jan 19: Messaging service WhatsApp which on Sunday faced issues in transmitting multimedia content including pictures and images, prompting social media users to share hilarious memes and messages, resumed regular services after over two hours.

#WhatsAppDown was the trending hashtag on Twitter for most part of Sunday afternoon in India along with several other countries such as Brazil, Europe and also parts of Middle-East including UAE, reported downdetector.in, a realtime problem and outage monitoring website.

Users of the popular messaging app were unable to send media files, stickers and GIFs.

Most users immediately went to Twitter to find out about the problem and check if others were facing the same issue.

Numerous tweets and memes took over the internet as soon as the news broke about the WhatsApp tech issue. After around two hours of technical glitch, the app resumed full service.

Even after full recovery of media transfer, people globally still continued checking the status of the messaging app.

WhatsApp has been one of the prime messaging apps since May 2009 and has recently collaborated with Facebook.

New Delhi, Jun 7: The Government of India (GoI) must strengthen the laws to protect animals, said People for the Ethical Treatment of Animals (PETA) India CEO Dr Manilal Valliyate on Sunday, following an elephant's death in Kerala and cow injured due to ingestion of explosives in Himachal Pradesh.

"Such incidents are not just restricted to certain regions but are happening all across the country. PETA receives more than 100 similar cases every day. People send in their complaints to us, not just for cows and elephants but for so many other animals as well," he said.

The PETA chief urged the GoI to strengthen the laws established to protect animals.

"As per the current laws set out against animal cruelty, the perpetrator would only be charged Rs 50,000 as a fine. That is equivalent to no punishment at all," added PETA India CEO.

He expressed his anguish against municipal agencies as well, saying that they are not doing "serious" work. He also highlighted how cows are left on the roads to wander, after milking them, to feed on garbage, in several parts of the country.

"These injustices against animals through explosives has been going on for quite a while. But for the first time, it has received such public attention," he said.

After a pregnant elephant was fed cracker-filled pineapple and her eventual death on May 27 in Kerala's Palakkad district, a pregnant cow sustained fatal injuries on May 25 due to accidental ingestion of explosives in Dadh village of Bilaspur district of Himachal Pradesh.

One person has been arrested in the Dadh village for allegedly hurting the cow.