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NEW DELHI: The director general of health services in a letter to states has made it clear that the use of “valved respirator N-95 mask” 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.
Health ministry’s officer on special duty Rajesh Bhushan reiterated on Tuesday that “if an asymptomatic person is wearing a valved N-95 mask, then the propensity of that person infecting others exists”.
“This is an evolving situation and if we’re introduced to new facts that may require us to change the current advisory, then we’ll do so,” he added.
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On Monday, DGHS Dr Rajiv Garg said in a letter to the national health mission and to all principal secretaries (health) in states that “it has been observed that there is an inappropriate use of the N-95 mask (particularly with valved respirator) by the public other than designated health workers”. He asked the state authorities to instruct all concerned to follow guidelines on use of face and mouth coverings and prevent inappropriate use of N-95 masks.

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