What do you call it when like other people preparing or touching your food?

The term for this is "cross-contamination". Cross-contamination occurs when harmful bacteria or other microorganisms are transferred from one surface or object to another. In the context of food preparation, this can happen when raw meat or poultry comes into contact with other foods, such as cooked meats, vegetables, or fruits. It can also occur when dirty hands, utensils, or cutting boards are used to prepare food. Cross-contamination can lead to foodborne illness if the harmful microorganisms are ingested.