Which Infectious Disease Intervention Is Most Representative of Secondary Prevention

Which infectious disease intervention is most representative of secondary prevention?

A) Clients with human immunodeficiency virus (HIV) infection are encouraged to use condoms to protect their sexual partners.
B) Clients with HIV infection are given medications to improve immunological response.
C) Health care workers are encouraged to receive annual vaccinations for influenza.
D) Health care workers are required to have a tuberculosis (TB) skin test or chest X-ray.