Public bathrooms can be nauseating – literally.

Scientists at the University of Colorado found that a typical toilet harbors 19 phyla of bacteria.

Study author Dr Gilberto Flores says while many are harmless, each family has potentially bad bugs. So wash your hands and use a hand sanitiser.

Propionibacteriaceae

Bad bug: propionibacterium acnes, which causes acne and eye infections

Streptococcaceae

Bad bug: streptococcus pyogenes, the culprit behind strep throat

Staphylococcaceae

Bad bug: staphylococcus aureus, which can leave you with a skin infection

Clostridiales

Bad bug: clostridium tetani, responsible for tetanus

Corynebacteriaceae

Bad bug: corynebacterium diphtheriae, which can cause diphtheria

Moraxellaceae

Bad bug: moraxella catarrhalis, often linked to respiratory infections