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Severe osteomyelitis caused by Myceliophthora thermophila after a pitchfork injury
Lauren Destino1, Deanna A Sutton, Anna L Helon
1Department of Pediatrics, Medical College of Wisconsin and Children's Hospital of Wisconsin, USA. ldestino@mcw.edu
Background:
Traumatic injuries occurring in agricultural settings are often associated with infections caused by unusual organisms. Such agents may be difficult to isolate, identify, and treat effectively.
Case Report:
A 4-year-old boy developed an extensive infection of his knee and distal femur following a barnyard pitchfork injury. Ultimately the primary infecting agent was determined to be Myceliophthora thermophila, a thermophilic melanized hyphomycete, rarely associated with human infection, found in animal excreta. Because of resistance to standard antifungal agents including amphotericin B and caspofungin, therapy was instituted with a prolonged course of terbinafine and voriconazole. Voriconazole blood levels demonstrated that the patient required a drug dosage (13.4 mg/kg) several fold greater than that recommended for adults in order to attain therapeutic blood levels.
Conclusion:
Unusual pathogens should be sought following traumatic farm injuries. Pharmacokinetic studies may be of critical importance when utilizing antifungal therapy with agents for which little information exists regarding drug metabolism in children.
Insights
Unusual fungal infections can occur after farm injuries. Pediatric patients may require higher antifungal drug doses than adults for effective treatment.
Area of Science:
- Medical Mycology
- Pediatric Infectious Diseases
- Agricultural Medicine
Background:
- Agricultural injuries pose risks of infection from uncommon microorganisms.
- These unusual pathogens present diagnostic and therapeutic challenges.
Observation:
- A pediatric case involving extensive knee and femur infection after a barnyard pitchfork injury.
- The causative agent identified was Myceliophthora thermophila, a rare thermophilic fungus found in animal excreta.
Findings:
- The infection showed resistance to standard antifungal medications like amphotericin B and caspofungin.
- Treatment with terbinafine and voriconazole was initiated.
- Pediatric voriconazole dosing required significantly higher levels (13.4 mg/kg) than standard adult recommendations to achieve therapeutic blood concentrations.
Implications:
- Highlights the importance of considering unusual pathogens in agricultural trauma.
- Emphasizes the critical role of pharmacokinetic studies for optimizing antifungal therapy in children, especially with limited pediatric data.
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