Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Transplant infection

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In one line

·Transplant drugs that block rejection also block the body's germ fighters, so infections come in waves based on time since surgery.

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Normal physiology

·A healthy immune system has two layers that stop germs before they make you sick: the innate team (neutrophils, macrophages, and barriers like skin and mucous membranes) blocks invaders fast and crude, and the adaptive team (T-cells and antibodies) hunts down hidden viruses, fungi, and parasites with precision.

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What goes wrong

·Transplant patients take immunosuppressive drugs—calcineurin inhibitors (tacrolimus, cyclosporine), antimetabolites (mycophenolate, azathioprine), corticosteroids (prednisone), and monoclonal antibodies (basiliximab, alemtuzumab)—to stop T-cells from attacking the new organ, but these drugs also cripple the innate barriers and adaptive hunters that kill germs, leaving the body wide open to infections that healthy people never get.

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Hallmark signs

·Fever (temperature above 100.4°F or 38°C)
·Pain, redness, warmth, or swelling at the surgical site or around the transplanted organ
·The transplanted organ stops working as well (like rising creatinine in a kidney transplant or rising liver enzymes in a liver transplant)
·Cough, trouble breathing, or low oxygen levels (in lung transplant or widespread infection)
·Chills and shaking (rigors)
·Feeling very tired, weak, or confused
·Diarrhea, belly pain, or nausea (especially with CMV or C. difficile infection)
·New or worsening fluid buildup (like swelling in the legs, belly, or around the lungs)

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Red flags · escalate now

·Sudden drop in blood pressure or fast heart rate (signs the infection may be in the bloodstream, called sepsis, which can quickly damage organs)
·Confusion, extreme sleepiness, or trouble waking up (the brain isn't getting enough oxygen or is being poisoned by infection toxins)
·Trouble breathing, very fast breathing, or oxygen levels dropping below 90% (the lungs or blood can't deliver enough oxygen to keep the body alive)
·Lab results show the transplanted organ is failing fast (like creatinine jumping in a kidney transplant or liver enzymes spiking in a liver transplant)
·Signs of rejection happening at the same time as infection (fever plus biopsy changes), because the two can look alike and treating one wrong can make the other worse

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Workup

·Complete blood count with differential (CBC with diff)
·Blood cultures (aerobic and anaerobic, two sets from separate sites)
·CMV quantitative PCR (viral load) in plasma
·BK virus quantitative PCR in plasma (kidney transplant) and urine
·Bronchoalveolar lavage (BAL) with PJP staining (Gomori methenamine silver or immunofluorescence), fungal culture, bacterial culture, and viral PCR panel
·Chest CT with contrast (if respiratory symptoms)
·Serum creatinine, BUN, liver function tests (AST, ALT, bilirubin, alkaline phosphatase), and tacrolimus or cyclosporine trough level
·EBV quantitative PCR in plasma (if swollen lymph nodes (lymphadenopathy), constitutional symptoms, or atypical lymphocytosis)

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Treatment

·Broad-spectrum empiric antibiotics (e.g. piperacillin-tazobactam or meropenem plus vancomycin) started immediately when fever appears in the first month post-transplant
·TMP-SMX (trimethoprim-sulfamethoxazole) prevention (prophylaxis) started at transplant and continued for 6–12 months (single-strength or double-strength daily or three times weekly)
·Valganciclovir prevention (prophylaxis) for 3–6 months in high-risk CMV mismatch (donor CMV-positive, recipient CMV-negative, or recipient CMV-positive on heavy immunosuppression)
·Antifungal prevention (prophylaxis) with fluconazole (for Candida) or echinocandin or posaconazole/voriconazole (for invasive mold in high-risk patients like lung or liver transplant) for 1–3 months
·Reduce or temporarily hold calcineurin inhibitor (tacrolimus or cyclosporine) and antimetabolite (mycophenolate) doses if life-threatening opportunistic infection (PJP, CMV, invasive fungal infection) develops, while continuing or adjusting corticosteroid
·Pre-transplant vaccination of recipient (and living donor) with inactivated vaccines: influenza, pneumococcal (PCV13 followed by PPSV23), hepatitis B series, and MMR/varicella if seronegative and at least 4 weeks before transplant; avoid all live vaccines post-transplant
·IV immunoglobulin (IVIG) or CMV hyperimmune globulin in selected high-risk patients (e.g. severe hypogammaglobulinemia, refractory CMV despite antivirals)

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NCLEX trap

·Transplant infection and rejection can both cause fever, but they need opposite treatments. Look at the timeline and germ clues first. Early fever with positive cultures points to infection, not rejection. Giving more immunosuppression would make infection worse by weakening the body's ability to fight germs even more.
·In transplant patients, PJP prevention (prophylaxis) (a medicine that prevents a dangerous lung infection called Pneumocystis) must run for 6 to 12 months because the immune system stays weak that whole time. Stopping it early opens the door for PJP to come back and cause life-threatening pneumonia.
·Transplant patients cannot get live vaccines (vaccines made from weakened living germs, like MMR or varicella) because their weak immune system might not be able to fight even the weakened germ and could get sick from the vaccine itself. Only killed or inactivated vaccines are safe.
·CMV (cytomegalovirus, a virus that hides in the body and wakes up when immunity drops) can spread to the eyes, brain, gut, and lungs in transplant patients, causing blindness, brain infection, and death. Early treatment with valganciclovir (an antiviral drug) is critical and life-saving, not optional.
·The opposite is true in transplant infection. You might need to carefully lower immunosuppression while treating the specific germ with the right antibiotic, antiviral, or antifungal. Balancing rejection risk against infection risk is the hard part — too much suppression feeds infection, too little risks rejection.
·Transplant infection includes serious fungal infections like Candida (yeast that can invade the blood) and Aspergillus (a mold that grows in the lungs) because T-cell weakness (the immune cells that hunt fungi) is perfect for fungi to thrive. Antifungal prevention (prophylaxis) and careful line care prevent deadly fungal bloodstream and lung infections.

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