What contamination could effect customers arising from unkept handing of fruit by other customer

Bacterial contamination passed on from one person to another through the handling of fruit. If a person has bacteria on their hands and they handle fruit in the shop they are passing the bacteria onto the fruit. Another customer then touches the fruit or buys it and eats it and the bacteria is passed onto them potentially causing sickness.

are there any letter choices to this or is this an open ended question?