Immunisation and HIV

This chapter links two immune topics the exam loves: when a vaccine is truly unsafe to give, and what a falling CD4 count means for infection risk, everyday teaching, and ART adherence.

Vaccine safety: hold for the real reasons

Screen the record for true contraindications, not inconvenience. Inactivated vaccines are generally usable even when immunity is imperfect (timing still follows oncology/transplant protocols). Live vaccines need a working immune system and are not for pregnancy because a live organism can cause disease when defenses are down or fetal risk is unacceptable.

The mild-illness myth cancels needed protection. A runny nose or low-grade fever in a playful, eating child is not a medical hold for routine shots. Moderate or severe illness (toxic appearance, significant fever with systemic illness) can justify deferral until the client is better. Anaphylaxis to a component is a hard stop for that product. Egg-allergy nuance for influenza has modernized — follow current stem guidance rather than an old blanket ban unless the stem states anaphylaxis to a component.

Timing facts that still appear

• Hepatitis B series commonly begins at birth.
• Influenza vaccine is generally recommended yearly for adults when not otherwise contraindicated.
• Catch-up schedules for immunocompromised clients need provider clearance before any live product.
• After live vaccines, counsel on expected low-grade fever/irritability versus anaphylaxis signs that need emergency care.

HIV: CD4, opportunistic infection, and ART

HIV attacks CD4 lymphocytes. The CD4 count tells the team how much immune protection remains; viral load tells how active replication is. As counts fall into the profoundly low range (commonly discussed around 200 cells/microliter and below), opportunistic infections become the danger. ART (antiretroviral therapy) is daily medicine that suppresses replication so CD4 can recover — missed doses invite resistance and rising load.

Why opportunistic infections happen

Healthy immune systems clear organisms that rarely make the news. When CD4 help collapses, those same organisms (and reactivated latent infections) can fill the lungs, gut, brain, or skin. That is why a “simple cough” in advanced HIV is never simple on the exam. Prophylaxis meds (for example PCP prevention at low CD4) appear as ordered prevention, not optional vitamins.

ART adherence cues that matter on stems

Ask how the client actually takes pills: same time daily, pillbox, phone alarms, food requirements for specific agents, and what happens when nausea starts. Side effects and stigma sink adherence faster than “forgetting.” Teach that feeling better is not a reason to stop. Partner with case management for cost and pharmacy gaps. Post-exposure and perinatal protocols are time-sensitive order sets — start the pathway, do not lecture first.

Transmission teaching without stigma

Clear teaching prevents both reckless exposure and cruel isolation. HIV spreads when infected blood, sexual fluids, or perinatal routes move virus into another person. It does not spread by casual household life. Correct fear without shame so families keep hugging and sharing bathrooms with ordinary hygiene.

• Risk reduction: safer sex, not sharing needles, standard precautions for blood, ART as prescribed.
• Sustained undetectable viral load greatly reduces sexual transmission risk in current teaching — adherence is prevention as well as treatment.
• Household teaching corrects fear without isolating the client from ordinary family life.
• Perinatal questions expect treatment adherence and the ordered plan to protect the infant, not fatalism.
• Needle-stick stems: wash, report, start PEP pathway per protocol — do not wait for anxiety to peak.

Priority map