Class A: Physical examination of employees in catering industry, food factory, canteen, water plant and water dispenser factory.
Class B: Physical examination of employees in tourism, culture and entertainment, beauty salons, shopping malls, cosmetics factories and health centers.
Class C: Physical examination of general occupational recruitment in general factories and enterprises.
Class D: Physical examination of electricians, elevator workers, boiler workers and other high-temperature aerial workers.
Legal basis: Article 45 of the Food Safety Law of People's Republic of China (PRC), food producers and business operators shall establish and implement the health management system for employees. Persons suffering from diseases that hinder food safety as stipulated by the administrative department of health of the State Council shall not engage in direct contact with imported food. Food production and marketing personnel engaged in direct contact with imported food shall undergo annual health examination and obtain health certificates before taking up their posts.