NCLEX-RN® Immune and Infection Disorders: HIV, Sepsis, Immunosuppression, and Fever

Immunity and infection content for the NCLEX-RN®: HIV care priorities, early sepsis recognition, immunosuppressed patient safety, and fever management — with NCLEX-RN® question strategy.

The big picture

Infection and immunity questions span every NCLEX-RN® category. The nurse's role is to recognize early deterioration in immunocompromised patients, apply the sepsis bundle promptly, teach HIV prevention and treatment, and manage fever safely. A compromised immune system cannot protect itself — the nurse must protect it.

HIV and AIDS

HIV (human immunodeficiency virus) attacks CD4+ T-lymphocytes, destroying the immune system over time. AIDS (acquired immunodeficiency syndrome) is the advanced stage of HIV infection.

Transmission — what NCLEX® tests

HIV is transmitted through:

• Blood (sharing needles, transfusions, needle-stick injuries)
• Sexual fluids (unprotected sex)
• Breast milk (mother-to-child)

HIV is NOT transmitted through:

• Casual contact (hugging, shaking hands, sharing dishes)
• Coughing, sneezing, saliva (unless blood present)
• Mosquitoes or other insects

CD4 count and viral load — the key markers

AIDS is defined by: CD4 count < 200 cells/mm³ OR the presence of an AIDS-defining illness (opportunistic infection or cancer).

Opportunistic infections by CD4 threshold

Antiretroviral therapy (ART) — key nursing concepts

• Goal: Suppress viral load to undetectable (< 20–50 copies/mL)
• Patients take combination therapy (multiple drug classes to prevent resistance)
• Adherence is critical — even one missed dose can allow resistance to develop
• Teach patients: take medications at the same time every day; never skip; keep at room temperature
• Undetectable = Untransmittable (U=U): A person with an undetectable viral load cannot transmit HIV sexually — this is established science (per CDC and WHO)

Needle-stick injury — nurse's priority actions

1. Immediately wash the site with soap and water (squeeze to express blood; do not scrub)
2. Report to occupational health or supervisor immediately
3. Baseline blood work for the exposed nurse (HIV, hepatitis B, hepatitis C)
4. Source patient tested (with consent where required)
5. Post-exposure prophylaxis (PEP): Start within 72 hours — ideally within 2 hours; more effective the sooner it's started; course lasts 28 days
6. Document thoroughly

Sepsis

Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection. It is the leading cause of in-hospital death in the United States.

Sepsis definitions (Sepsis-3, 2016 — used in clinical practice)

qSOFA (quick bedside screening tool)

Score 1 point each for:

• Altered mental status
• Respiratory rate ≥ 22 breaths/min
• Systolic BP ≤ 100 mmHg

Score ≥ 2 = likely sepsis — escalate immediately.

Early recognition — know the classic signs

NCLEX® key: Early septic shock presents with warm, flushed skin and bounding pulses — unlike hypovolemic or cardiogenic shock which are cold. This is because sepsis causes massive vasodilation.

The 1-hour and 3-hour sepsis bundles

1-Hour Bundle (Surviving Sepsis Campaign, 2018):

1. Measure lactate (resuscitation end-point — elevated if > 2 mmol/L)
2. Draw blood cultures × 2 before antibiotics
3. Administer broad-spectrum IV antibiotics within 1 hour
4. Administer 30 mL/kg crystalloid (NS or LR) IV bolus for hypotension or lactate ≥ 4 mmol/L
5. Apply vasopressors (norepinephrine first-line) if MAP remains < 65 mmHg after fluids
6. Reassess frequently — this is a rapidly evolving emergency

NCLEX® order: Cultures → antibiotics → fluids. Culture BEFORE antibiotics always.

Nursing monitoring in sepsis

• MAP ≥ 65 mmHg is the resuscitation target (not just SBP)
• Urine output ≥ 0.5 mL/kg/hr (30 mL/hr for a 60 kg patient) indicates adequate renal perfusion
• Serial lactate — a falling lactate with treatment indicates response
• Vasopressors must go through a central line (peripheral vasopressors cause tissue necrosis)
• Glucose management: maintain blood glucose 140–180 mg/dL with insulin infusion in severe sepsis/ICU

Fever management

Fever is defined as a core temperature ≥ 38.3°C (101°F) by most clinical standards.

Fever in different populations

Fever management interventions

The "mnemonic for post-op fever": Wind, Water, Walking, Wound, Wonder drugs

• Wind (Day 1–2): Atelectasis — encourage deep breathing, incentive spirometry
• Water (Day 3–5): UTI — most common cause of hospital-acquired infection
• Walking (Day 4–6): DVT/PE — assess legs, ensure early ambulation
• Wound (Day 5–7): Surgical site infection — assess wound for redness, drainage
• Wonder drugs (Any day): Drug fever — review medications, especially new ones

Common immunosuppressive conditions

Corticosteroid immunosuppression

Patients on long-term corticosteroids (prednisone, methylprednisolone) are immunosuppressed.

Nursing priorities:

• Monitor for infections — signs may be masked (steroids suppress the inflammatory response)
• Monitor blood glucose (steroids cause hyperglycemia)
• Monitor bone density (long-term use causes osteoporosis)
• Teach: do not stop abruptly; carry medical alert; take with food to reduce GI upset

Transplant recipients

Organ transplant patients are on lifelong immunosuppression to prevent rejection.

Key drugs: Tacrolimus, cyclosporine, mycophenolate, prednisone.

Priority nursing concerns:

• Infection prevention — same precautions as neutropenic patients
• Rejection monitoring: Fever, organ-specific signs (reduced urine output for kidney; elevated liver enzymes for liver)
• Drug monitoring: tacrolimus and cyclosporine have narrow therapeutic ranges and cause nephrotoxicity — monitor creatinine and drug levels

NCLEX® clinical judgment focus

For immune/infection questions:

1. Recognize the immunocompromised patient — their usual signs of infection may be absent or blunted
2. Act faster than usual — what would be a routine fever in a healthy patient is a medical emergency in a neutropenic one
3. Culture before antibiotics — always, in every infection scenario
4. Sepsis = time-sensitive — lactate, cultures, antibiotics, fluids within 1 hour

Common NCLEX® traps:

• Giving antipyretics before notifying the provider about fever in a neutropenic patient
• Starting antibiotics before cultures in sepsis (reverses the order)
• Assuming elderly patients with sepsis will have a fever — they often don't
• Forgetting PEP must be started within 72 hours of a needle-stick

FAQ

What CD4 count defines AIDS?

AIDS is defined by a CD4 count < 200 cells/mm³ OR the presence of an AIDS-defining opportunistic illness (such as PCP, Kaposi's sarcoma, or CMV retinitis), regardless of CD4 count.

What is the difference between sepsis and septic shock?

Sepsis is organ dysfunction caused by infection. Septic shock is sepsis plus persistent hypotension that requires vasopressors to maintain MAP ≥ 65 mmHg AND serum lactate > 2 mmol/L after adequate fluid resuscitation. Septic shock has a much higher mortality (> 40%).

What does "undetectable = untransmittable" mean?

U=U (Undetectable = Untransmittable) means that a person living with HIV who consistently maintains an undetectable viral load (< 50 copies/mL) on antiretroviral therapy cannot sexually transmit HIV to their partner. This is supported by multiple large clinical trials and endorsed by the CDC and WHO.

Why does the first post-op fever usually mean atelectasis?

After surgery, patients breathe shallowly (due to pain, sedation, and supine positioning). Alveoli collapse (atelectasis), creating a fertile environment for mild inflammation and fever. This is not an infection — it resolves with deep breathing, coughing, and incentive spirometry. By days 3–5, infection (wound or UTI) becomes the more likely culprit.

When should a nurse start PEP after a needle-stick?

Post-exposure prophylaxis (PEP) should be started as soon as possible after HIV exposure — ideally within 2 hours and no later than 72 hours. After 72 hours, PEP is not effective. The full course is 28 days of combination antiretroviral therapy. Report the exposure immediately to initiate this process.

Key takeaways

• HIV: CD4 < 200 = AIDS. ART is daily, adherence-critical, lifelong. PCP prophylaxis at CD4 < 200. PEP within 72 h of exposure.
• Sepsis: qSOFA ≥ 2 = escalate. Culture → antibiotics within 1 hour → fluids → vasopressors if MAP < 65. Norepinephrine via central line.
• Fever: Neutropenic fever = emergency. Post-op fever mnemonic: Wind/Water/Walking/Wound/Wonder drugs.
• Immunosuppression: Masked infection signs. Monitor glucose and bone density in steroid users. Monitor drug levels and rejection signs in transplant patients.

Sources: NCSBN NCLEX-RN® 2023 Test Plan; CDC HIV Clinical Information; NIH AIDSinfo PEP Guidelines; AHRQ Sepsis Resources.

See also:

• Safety and Infection Prevention and Control: Isolation Precautions
• NGN Case Study: Sepsis and Septic Shock
• NCLEX-RN® Oncology Basics (Neutropenic Precautions)
• NCLEX-RN® Pharmacology Guide
• NCLEX-RN® Lab Values Guide

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