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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.

Eminent river engineer and former professor of civil engineering at IIT in the Banaras Hindu University (BHU) Prof. U.K. Choudhary has said that the judicious use of river technology can help resolve the Coronavirus crisis as well as the plight of Ganga river.

Choudhary, who is also founder of Ganga Research Centre at IIT (BHU), said: "The Ganga water contains a significantly higher proportion of bacteriophages - a kind of virus that kill bacteria. Our ancient scriptures like Vedas, Puranas and Upanishads say that Ganga jal is medicinal water. Scientists later found that Ganga water has bacteriophages capable of killing pathogens."

Explaining further, he said, "Let us analyze the source of bacteriophages. If we take three rivers of Himalayan origin having sources at different heights -the Ganga (Gomukh), Yamuna (Yamunotri) and the Sone river, we find the colours of waters are different. The whitish colour of Ganga water, greenish colour of Yamuna water and the brownish colour of Sone water is also indicative. As Gomukh is the highest among the three, its water comes from lowest depth of aquifer as compared to Yamunotri and Sone river," he explained.

Thus, the quality of river water is proportional to height of origin point. This defines the genetic character of Ganga water. The balanced flow of this water in entire length of the Ganga defines the medicinal property of Ganga water," he stated.

Prof Chaudhary said that the bacteriophages in the Ganga can curb the spread of coronavirus through soil, water and air.
He suggested that the idea is to preserve the medicinal value of Ganga water and to use it to fight Corona. He said that this can be done by opening the gates of all the dams and barrages in a way that the discharge through each is similar to the water at Gomukh. In this way, the concentration of bacteriophage will be enhanced in Ganga water making it more effective against pathogens.

"With increasing diffusion of bacteriophages in water and soil, the spread of Coronavirus will be impacted and reduced. This methodology and technique can also help maintain the quality of Ganga water later when the problem of Corona ends," he said.