The reasoning: milk hygiene
Sources of contamination: the animal (mastitis, TB, brucellosis, Q fever), the milker (hands, cough), utensils, water, flies, storage. Milk‑borne diseases: TB (M. bovis), brucellosis, salmonellosis, E. coli, Campylobacter, Listeria, typhoid, cholera, hepatitis A, streptococcal infections, staphylococcal enterotoxin.