Pomimo tak małego rozmiaru wirusów (tak bardzo mniejsze od bakterii - a czerwona krwinka to nawet przy bakteriach jest olbrzym) przed koronawirusem rzekomo miała owce na dwóch nogach chronić już maseczka FFP2...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5058571/
[...] The minimum protection factors (PFs) were observed for particles between 0.263 and 0.384 _μ_m. No significant difference in PF results was found among FFP respirator categories and particle size. A strong association between fit factors and protection factors was found. The study indicates that FFP respirators may not achieve the expected protection level and the APFs may need to be revised for these classes of respirators.
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