Questions about example sentences with, and the definition and usage of "Pathogen"

A: A pathogen is an organism that can produce disease (a virus/an infectious agent). So, the infectious agent is transported/spread by/through air.

A: It means that it has not been purified and sealed from contamination. For example, with cotton swabs, it is a "sterile" swab if they are individually wrapped (like doctor's use) and "non-sterile" if you buy a box of cotton swabs for your home. A sterile filter removes most, if not all, pathogens, while a non-sterile filter will let some pathogens through.

A: يقلل من البكتريا المرضية

A: A pathogen is a harmful microorganism, bacteria and viruses are also pathogens😀

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A: covid-19 is a disease, not a kind of pathogen. Its complete term is coronavirus disease 2019

A: can you complete with the following sentence or the paragraph just ended here?

A: It means that receptors of cells bind to pathogens.