Final answer:
The zoster immunization is recommended for a 60-year-old client to reduce the risk of shingles and its complications by boosting the immune defense against the varicella-zoster virus.
Step-by-step explanation:
The zoster immunization is recommended for a 60-year-old client. The varicella-zoster virus (VZV), initially causing chickenpox, can reactivate in adults as shingles, particularly in older individuals. Zoster vaccines are designed to boost immune responses to VZV, reducing the risk of shingles and its associated complications, such as postherpetic neuralgia. While shingles can occur in people of any age, it is more common in older adults, and the recommendation for vaccination typically begins at age 60, as the immune system weakens with age making the individual more susceptible to reactivation of the virus.