In adaptive immunity if you are exposed to the flu virus while you are out for lunch, what category does that fall in for adaptive immunity?

The transmission of viral infections via oral does not change the categorization of the adaptive immune responses (which are classified into antibody and cell-mediated immune responses)

Explanation:

The adaptive (acquired) immune system involves specific cells that act against pathogenic organisms in order to destroy them. The adaptive immune responses generate immunological memory after the initial response to a specific pathogenic organism, thereby leading to an enhanced response during subsequent infections. This type of immunity is associated with B cells and T cells and antigen-specific memory (antibodies). Influenza is a viral infection caused by the influenza virus, which is transmitted from coughs and sneezes, although the infection via oral may also occur from contaminated water and foods.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.