A 65-year-old immunocompromised patient presents to the Emergency Department with a painful, blistering rash on the left side of their chest. They have been undergoing chemotherapy for breast cancer. Which of the following is the most appropriate initial treatment for this patient?
A
Oral acyclovir 800 mg 5 times daily for 7 days
B
Intravenous acyclovir 10 mg/kg every 8 hours for 7-10 days
C
Oral valacyclovir 1000 mg 3 times daily for 7 days
D
Topical acyclovir cream 5% applied 5 times daily for 7 days
E
Oral famciclovir 500 mg 3 times daily for 7 days