Risks
for Drain Fly
This is mainly a nuisance insect: adults neither bite nor harm plumbing. Source: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/ENTO/ENTO-414/ENTO-414.pdf Source: https://cfaes.osu.edu/fact-sheet/drain-flies-moth-flies Sources differ on disease: UF/IFAS reports the related genus *Psychoda* spreads no known pathogens, while Ohio State allows that flies from filthy sites might mechanically ferry microbes of concern — a sanitation nuisance, not a confirmed vector. Source: https://ask.ifas.ufl.edu/publication/IN1226 Source: https://cfaes.osu.edu/fact-sheet/drain-flies-moth-flies The one documented health angle is respiratory: in very large numbers, inhaled scales and fragments of dead flies have been linked to respiratory problems, including bronchial asthma — a hazard of heavy occupational exposure like sewage plants, not a few flies on a wall. Source: https://ask.ifas.ufl.edu/publication/IN1226 Source: https://cfaes.osu.edu/fact-sheet/drain-flies-moth-flies