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 = increased risk of poor outcome — escalate the assessment, but do not use qSOFA alone to diagnose or rule out sepsis. Follow the facility's screening and escalation pathway.

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.

Time-sensitive sepsis care

1. Recognize possible organ dysfunction and escalate immediately. Measure lactate when indicated and reassess trends in context.
2. Obtain blood cultures before antimicrobials when this does not materially delay treatment. Never postpone life-saving therapy to complete a test.
3. Give antimicrobials immediately—ideally within 1 hour—for septic shock or a high likelihood of sepsis. For possible sepsis without shock, rapidly investigate infectious and noninfectious causes and, if concern persists, give antimicrobials within the timeframe in the current protocol.
4. Give crystalloid for sepsis-induced hypoperfusion or septic shock and reassess frequently. Initial volume is individualized when heart failure, kidney disease, or another risk of overload is present.
5. Start vasopressors when hypotension persists; norepinephrine is the usual first-line agent. Follow the institution's vascular-access and monitoring protocol.

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
• A well-sited proximal peripheral IV may be used to start vasopressors promptly while central access is arranged when needed; inspect the site frequently and follow the extravasation protocol
• 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

Post-op fever: move beyond the “five Ws”

The traditional “wind, water, walking, wound, wonder drugs” mnemonic can remind you to consider several causes, but its day-by-day timetable is not reliable enough to diagnose a patient. Use it only as a prompt for a complete assessment. Evaluate hemodynamic stability, oxygenation, respiratory findings, the wound and invasive devices, urinary symptoms, medication and transfusion exposure, thrombosis risk, and the type of operation.

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.

Does the first post-op fever usually mean atelectasis?

Do not make that assumption. Atelectasis is common after surgery and needs prevention and treatment when respiratory findings support it, but fever alone does not prove atelectasis. Early fever is often a noninfectious response to surgery. Assess the whole patient and escalate instability or a suspected serious cause promptly.

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: Use the facility screening pathway and the full clinical picture; qSOFA alone is not a rule-out tool. Obtain cultures promptly when this does not materially delay treatment. Give antimicrobials immediately for septic shock or high-likelihood sepsis; rapidly investigate possible sepsis without shock. Start fluids and vasopressors according to the protocol and patient response.
• Fever: Neutropenic fever is an emergency. For postoperative fever, use timing only as context and assess the whole patient.
• Immunosuppression: Masked infection signs. Monitor glucose and bone density in steroid users. Monitor drug levels and rejection signs in transplant patients.

Sources: NCSBN, 2026 NCLEX-RN® Test Plan; CDC, HIV Clinical Care; NIH, HIV Clinical Guidelines; Society of Critical Care Medicine, Surviving Sepsis Campaign Guidelines. Follow current institutional sepsis, exposure, and postoperative protocols.

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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