rewa - nasal filters                    rev 3 jun 2022


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summary:

  * Effective for nasal transmission 
      -- See sources below
  * But you have to keep your mouth closed, 
      your eyes are still exposed,
      as well as the rest of your face. 
  * I am thinking - when you want to eat with someone, or hang out
      with more face interaction: nasal filter and non-fitting face shield.
      -- jw

  * They come in different sizes.

  * Types:
      - inserted into the nostrils, with a plastic 'U' connecting them.
      - two patches with sticky edges, covering the nostrils.
          Hmm maybe could make yourself with pieces of N95 mask?

  * Cotton ball nasal plug is probably as effective as filter, and cheaper.
      -- NIH study jan 2004 below

  
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explanations and studies:

  * In-nose filters from Resprana claim extra coronavirus protection
      Shows photos of filters, and people wearing.
      2020
      https://wtop.com/coronavirus/2020/04/in-nose-filters-from-resprana-claim-extra-coronavirus-protection/

  * Nasal plugs for preventing respiratory infections 
      "The cotton ball nasal plug is probably as effective as the 
          N-95 respirator or surgical masks at preventing infection, 
          and is much cheaper." 
      NIH Study
      jan 2004
      https://pubmed.ncbi.nlm.nih.gov/14997706/


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effectiveness:




.......................................................
sources:

  * Using nasal air filters to help allergic rhinitis
      "appears to be helpful at reducing or preventing some types of nasal allergy symptoms."
      -- Daniel More MD
      https://www.verywellhealth.com/nasal-air-filters-83163
      2 jun 2022

  * Section 6.2 - nostril filters
      https://www.intechopen.com/chapters/77245
      pub 22 dec 2021

  * IIT Delhi creates world's smallest wearable air purifier: A nasal patch
      "Naso95"
      "N95 grade nasal filter that attaches to a users’ nasal opening while keeping bacterial, viral infection, pollen and air pollution at bay."
      Company is Nanoclean Global
      https://www.indiatimes.com/technology/science-and-future/iit-delhi-smallest-wearable-air-purifier-nasal-holes-562969.html
      pub 25 feb 2022
     


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