Final answer:
The Td vaccine is safe and advisable to give to pregnant women, while live vaccines such as herpes zoster, varicella, and MMR should be avoided.
Step-by-step explanation:
A nurse providing teaching about immunizations to a pregnant client should include that the tetanus and diphtheria (Td) vaccine is safe to administer during pregnancy. Vaccines for herpes zoster, varicella, and measles, mumps, and rubella (MMR) are generally contraindicated during pregnancy due to their live, attenuated components which hold a potential risk to the unborn child. In contrast, the Td vaccine, which includes protection against tetanus and diphtheria, and the Tdap vaccine (which also includes pertussis) are inactivated vaccines and are recommended during pregnancy to protect both the mother and the baby from these serious diseases.