Final answer:
The best option for the 82-year-old woman who cannot take the influenza vaccine due to allergies but has been exposed to the virus is to begin oral oseltamivir (Tamiflu) therapy as soon as possible to decrease flu symptoms and shorten the duration of the illness.
Step-by-step explanation:
The best option for the 82-year-old woman who cannot take the influenza vaccine due to allergies but has been exposed to the virus is option D.
She should begin oral oseltamivir (Tamiflu) therapy as soon as possible.
Tamiflu is a neuraminidase inhibitor that can decrease flu symptoms and shorten the duration of the illness.
By inhibiting the spread of the virus from infected to uninfected cells, it can help prevent the flu from progressing.
It is important for her to start the therapy as soon as possible, even before symptoms begin, to maximize its effectiveness.