Based on CD4 count, when is treatment recommended for patients with HIV infection?
a. All patients, regardless of CD4 count, are recommended for treatment
b. Patients with a CD4 count of <1,000 cells/mm3 are recommended for treatment
c. Patients with a CD4 count of >1,000 cells/mm3 are recommended for treatment
d. Treatment is based on active infection, not on CD4 count
