Inducible Clindamycin Resistance among Staphylococci Isolated from Burn Patients
A Zorgani1, O Shawerf, K Tawil
1Department of Microbiology and Immunology, Faculty of Medicine, El-Fateh University for Medical Sciences.
Abstract:
Clindamycin has been used successfully to treat pneumonia and soft-tissue infections caused by methicillin-resistant Staphylococcus aureus. However, inducible clindamycin resistance has been described as a cause of treatment failure of such infections. A total of 159 staphylococcal isolates from different clinical specimens from burn patients in Tripoli Burn Center were tested for inducible clindamycin resistance by the disk-diffusion induction test. Inducible clindamycin resistance was detected in 66.2% of 65 methicillin-resistant S. aureus isolates and in none of 55 methicillin-sensitive S. aureus, 10 methicillin-resistant coagulase negative staphylococci and 29 methicllin-sensitive coagulase negative staphylococci isolates. In our setting, clindamycin can be used for the treatment of infections due to staphylococci, but we recommend that staphylococci isolates, particularly methicillin-resistant S. aureus, are tested by the D-test before treatment.
Insights
Inducible clindamycin resistance is common in methicillin-resistant Staphylococcus aureus (MRSA) from burn patients. Testing for this resistance using the D-test is recommended before clindamycin treatment to prevent infections.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Background:
- Clindamycin is effective against certain Staphylococcus aureus infections, including MRSA.
- Inducible clindamycin resistance can lead to treatment failure in these infections.
- Staphylococcal infections are a concern in burn patient care.
Purpose of the Study:
- To determine the prevalence of inducible clindamycin resistance in staphylococcal isolates from burn patients.
- To assess the utility of the D-test for detecting this resistance.
- To guide appropriate antibiotic therapy for staphylococcal infections in this patient population.
Main Methods:
- A total of 159 staphylococcal isolates were collected from clinical specimens of burn patients.
- The disk-diffusion induction test (D-test) was employed to detect inducible clindamycin resistance.
- Isolates included methicillin-resistant S. aureus (MRSA), methicillin-sensitive S. aureus (MSSA), and coagulase-negative staphylococci (CoNS).
Main Results:
- Inducible clindamycin resistance was detected in 66.2% of MRSA isolates (43 out of 65).
- No inducible resistance was found in MSSA, methicillin-resistant CoNS, or methicillin-sensitive CoNS isolates.
- The D-test identified a significant rate of inducible clindamycin resistance in MRSA.
Conclusions:
- Clindamycin may be a viable treatment option for staphylococcal infections if inducible resistance is absent.
- Routine D-testing is crucial for MRSA isolates to guide effective clindamycin use.
- This approach can help prevent treatment failures associated with inducible clindamycin resistance in burn patients.
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