1. Of the following list, who is most at risk of contractingListeria?
    1. A 30 year old mother who lives in an area with an uncontrolledmosquito population
    2. A 70 year old male who makes his own cheese from unpasteurizedmilk
    3. An unvaccinated infant
    4. A 75 year old woman having unprotected sex with multiplepartners

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