All members of the seven families for whom mary mallon prepared meals developed typhoid fever. mary did not get sick. this is an example of

This is an example of a carrier.

Explanation:

A carrier is an individual with no evidence of disease but ports the infectious organisms. Dissemination means spreading of the organism in the environment.

The carrier is a person who is likely to be infected with the pathogen. They do not expose any signs or symptoms.

Microbiologist explains that the carrier can carry the disease or illness without showing obvious symptoms, and they can spread them as well.

In the above statement, Mary Mallon is the carrier and causes typhoid fever for all the members of seven families.

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rain should be the answer.