Which of These Conditions Will Likely Ensure an Immunocompromised Host

Which of these conditions will likely ensure an immunocompromised host? (Select all that apply)

A) A change in the microflora because of antibiotic therapy.
B) Immunosuppression natural to pregnancy
C) Altered immune status due to administration of immunosuppressive drugs
D) an individual who is very elderly
E) Altered immune status of the individual due to HIV