Final answer:
The tissue and straw used by a person with the flu are considered contaminated because they can contain the influenza virus and facilitate its spread.
Step-by-step explanation:
A person with the flu blew their nose in a tissue and then drank from a straw; the tissue and straw are considered contaminated.
Objects that have come into contact with bodily fluids from a sick person, such as mucus from blowing one's nose, can harbor viruses or bacteria. In the case of the flu, these items can contain influenza viruses. Therefore, it is important to properly dispose of the tissue and not to share or reuse the straw as they can be a source of infection and facilitate the spread of the flu. Contaminated objects should be handled carefully to prevent the transmission of illnesses.