Distancing, N95 Masks and Eye Covering Protect Against Respiratory Illness

To wear a facial covering or mask, or not, has been turned into a political affiliation and machismo issue in the United States instead of a scientific, medical and public health issue. A publication in the British medical journal Lancet clearly brought the issue into a medical public health category.  The “cliff notes” summary of the study is that for each meter (2.2 meters = one foot) you distance from a contagious individual, the less likelihood you have of becoming infected with that illness.  Facial coverings diminish your risk of catching the disease by about 15% and N95 or KN95 respirator masks work better than surgical masks, bandanas or cloth masks.

The study was a systemic review and meta-analysis of 172 observational studies involving SARS, MERS and COVID-19 spanning six continents with almost 26,000 participants.  Daniel Chu, MD, PhD made it clear, “The risk for infection is highly dependent on the distance to the individual infected and the type of face mask and eye protections worn. Six feet or more away is the optimal distance to maintain. While N95 masks scored best in terms of protection for health care workers, facial coverings of any type reduced the chance of infections from 17.4% to 3.1%. Eye protection reduced the risk of infection from 16% to 5.5%.”

Due to a shortage of personal protective equipment (PPE), the CDC downgraded its requirements for health care workers treating sick infected individuals  to surgical masks, cloth masks or bandanas.  Professor Raina MacIntyre, MBBS, PhD at the Kirby Institute University of New South Wales in Sydney went on to say that recommending anything less than an N95 mask for health care workers is like sending troops into battle “ unarmed or with bows and arrows against a fully armed enemy.”

Many wonder what the difference is between an N95 respirator mask and a KN95 respirator mask. They both are supposed to prevent 95% of the particles of a certain size from penetrating. If the masks are reviewed and approved and certified by USA agencies such as OSHA or the CDC, they are labeled N95.  If they are reviewed by similar agencies in China, they are labeled KN95. In most cases the product is made outside the USA even if the company is an American firm.

Key points to remember are:

  • Distancing works with over six feet best for preventing person to person transmission of respiratory illnesses like Covid-19.
  • Facial coverings reduce the risk of infection.
  • N95 and KN95 are the gold standard for health care workers.
  • Eye covering reduces infections even further. 

This is not a macho or political issue. It’s an infectious disease public health issue.  Be smart and considerate of others. Cover your mouth, cover your eyes and keep six feet or more apart.

One Response

  1. This is such an informative blog, I love reading your blogs. Every time they are super informative and educational. Keep posting more.

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