noun
Rare, dated technical term for a virus, literally 'filterable pathogen'. Modern Japanese almost always uses ウイルス instead.
See also: ウイルス
Filterable pathogens were once defined as pathogens that pass through bacterial filters.
この古い文献では、ウイルスのことを濾過性病原体と呼んでいる。
In this old document, viruses are referred to as filterable pathogens.