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A breathable biological face covering comprising a fabric material and an anti-pathogen substance on the fabric material. The anti-pathogen substance comprises a lactoferrin protein. The amount of lactoferrin protein on the fabric material may be in the range of 0.6-1.5 grams/m2 of fabric material. Another embodiment is a lactoferrin composition comprising an aqueous fluid at pH<7.0 and lactoferrin protein mixed in the aqueous fluid at a concentration of 0.6-1.5 grams per liter. This lactoferrin composition may be administered into the respiratory tract. This composition could be useful against respiratory microbial pathogen, such as influenza virus or coronavirus.