Simplify. Write the answer with positive exponents only. 
Definitions:
Reservoir Host
An organism that harbors a pathogen for an extended period, without being affected by it, serving as a source of infection for other species.
Pathogen
A biological agent that causes disease or illness to its host.
Carrier
An individual or entity that transports goods or people; in genetics, it also refers to someone who has one copy of a recessive gene for a disease.
Unpasteurized Milk
Milk that has not undergone pasteurization, a process to kill harmful bacteria by heating the milk for a short time.
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