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New Delhi, Jul 21: The Centre has written to all states and union territories warning against the use of N-95 masks with valved respirator by people, saying these don't prevent the virus from spreading out and are "detrimental" to the measures adopted for its containment.

The Director-General of Health Services in the Ministry of Health, in a letter to the Principal Secretaries of health and medical education of states, said it has been observed that there is "inappropriate use" of N-95 masks, particularly those with valved respirator, by the public other than designated health workers.

The DGHS referred to the advisory on the use of homemade protective cover for face and mouth available on the website of the Ministry of Health.

"It is to bring to your knowledge that the use of valved respirator N-95 masks is detrimental to the measures adopted for preventing the spread of coronavirus as it does not prevent the virus from escaping out of the mask. In view of the above, I request you to instruct all concerned to follow the use of face/mouth cover and prevent inappropriate use of N-95 masks," DGHS Rajiv Garg said in the letter.

The government had in April issued an advisory on the use of homemade protective cover for face and mouth, asking people to wear it, particularly when they step out of their residences.

The advisory stressed such face covers must be washed and cleaned each day, as instructed and states that any used cotton cloth can be used to make this face cover. 

The colour of the fabric does not matter but one must ensure that the fabric is washed well in boiling water for five minutes and dried well before making the face cover. Adding salt to this water is recommended, it said.

It also listed the procedures of making such homemade masks, asking to ensure it fits the face well and there are no gaps on the sides.

It urges people to wash hands thoroughly before wearing the face cover,  switching to another fresh one as the face cover becomes damp or humid, and never reusing it after single use without cleaning it. 

"Never share the face cover with anyone. Every member in a family should have separate face cover," the advisory stated.

Google on Friday announced the launch of a new feature on Google Search, Assistant, and Maps for users in India to help them find information on COVID-19 testing centres near them.

The search giant has partnered with the Indian Council of Medical Research (ICMR) and MyGov to provide the information on authorised testing labs.

The feature is currently available in English and eight Indian languages including Hindi, Telugu, Tamil, Malayalam, Kannada, Bengali, Gujarati, and Marathi.

According to the company, users will now see a new "Testing" tab on the search result page providing a list of nearby testing labs along with key information and guidance needed before using their services.

On Google Maps, when users search for keywords like "COVID testing" or "coronavirus testing" they will see a list of nearby testing labs, with a link to Google Search for the government-mandated requirements.

Google said that the Search, Assistant, and Maps currently feature 700 testing labs across 300 cities and working with authorities to identify and add more testing labs located across the country.

The company reiterates that it is important to follow the recommended guidelines that help determine testing eligibility before visiting.