Microbiological status of anti-SARS CoV-2 protective face masks

The SARS-CoV-2 pandemic situation put extreme pressure on the worldwide medical system from medical
personnel to medical equipment. The protective face mask became the front line of anti-SARS-CoV-2
prevention methods, used by most of the world's population, more than 7 billion people. The massive demand
for face masks activated the world market, where countries from different continents increased their mask
production and commercialization worldwide. Unfortunately, the focus on face mask production mostly
relied on their ability to filter small-size molecules and less on their microbiological sterile status. Since
bacterial structural communities could differ between various large population groups or continents, in this
study, we analyzed the microbial quality of face masks received from various countries/continents. There
were analyzed the microbiological load of four types of masks, three from China and one from Romania. The
bacterial density from masks was analyzed by membrane filtration and swabbing bacterial collection
techniques. The results showed the Romanian mask had a smaller bacterial load than the Chinese masks. In
addition, the bacterial identification showed a wide range of bacterial strains, quite different between face
mask types.