Upon inquiry, a doctor in official website learned that the Food Safety Law promulgated by the state in 2009 and other relevant laws clearly stipulate that hepatitis B virus carriers can engage in food-related industries and apply for health certificates. The main transmission routes of hepatitis B are blood, body fluids, sexual contact and vertical transmission of infection from mother to child. Hepatitis B virus carriers can engage in food hygiene-related work and will not spread through the digestive tract and respiratory tract.