1600. Mycoplasma pneumoniae Macrolide Resistance in Children in Central Ohio Detected by Sequencing
Session: Poster Abstract Session: Stewardship: Pediatric Antimicrobial Stewardship
Friday, October 6, 2017
Room: Poster Hall CD
Posters
  • Mycoplasma pneumoniae Macrolide Resistance in Children in Central Ohio Detected by Sequencing.pdf (699.7 kB)
  • Background: Mycoplasma pneumoniae(Mp) is one of the most common causes of LRTI in school aged children, with estimates of up to 20% of cases of community-acquired pneumonia (CAP). Macrolides are the drug of choice for treating Mp infections, but in the last 2 decades there has been emergence of resistance worldwide. Reported rates in USA vary from 3.5 up to 10.8%, but rates in Ohio are unknown. Currently there is no well-established, standardized method for detecting macrolide resistance and antibiotic treatment is empiric because of these limitations. Our goal was to determine the frequency of macrolide resistance in children with Mp respiratory infections in central Ohio.

    Methods: A convenience sample of Mp positive PCR identified by our laboratory-developed assay, obtained from both inpatient and outpatient settings, were selected. These were then cultured using Remel’s SP4 glucose broth and then incubated at 35°C until isolates grew, or for a maximum of 4 weeks. All samples that yield positive cultures were then sequenced for the domain V of the 23S rRNA (nucleotide 1937-2154, accession no. X68422) using Sanger methods and sequences were compared with corresponding region of wildtype reference strain (ATCC 15322).

    Results: For the period of October 2015-March 2017, culture was attempted in 433 PCR-positive samples, and 347 (80%) yield an isolate. Sequencing was performed in those 347 samples and was successful in 334 (96%). A macrolide resistance mutation was detected in 10 samples (3%). From the 10 mutations detected, 7 (70%) were the A2063G mutation, and 3 (30%) were A2064G. We also detected a deletion in A2065 of unknown significance in 3 samples (0.9%).

    Conclusion: In this pediatric population, culture was successful in 80% of PCR positive samples, thus providing isolates for sequencing to be able to assess our local resistance. Our overall Mp resistance was 3%, suggesting that empiric treatment with macrolides is still appropriate in Central Ohio. Additional studies are needed to correlate the presence of these resistance mutations with phenotypic susceptibility testing and clinical outcomes.

    Mariana Lanata Piazzon, MD1, Huanyu Wang, PhD2, Kathy Everhart, B.S.3, Octavio Ramilo, MD, FPIDS4 and Amy Leber, PhD3, (1)Pediatrics, Section of Infectious Diseases, Nationwide Children's Hospital, Columbus, OH, (2)Nationwide Children's Hospital, Columbus, OH, (3)Department of Laboratory Medicine, Nationwide Children's Hospital, Columbus, OH, (4)Pediatrics, Nationwide Children's Hospital, Columbus, OH

    Disclosures:

    M. Lanata Piazzon, None

    H. Wang, None

    K. Everhart, None

    O. Ramilo, Abbvie: Board Member , Consulting fee
    Regeneron: Board Member , Consulting fee
    Janssen: Board Member and Investigator , Consulting fee and Research grant
    NIH: Grant Investigator , Research grant

    A. Leber, BioFIre Diagnostics: Research Contractor and Scientific Advisor , Research support , Speaker honorarium and Travel expenses

    Findings in the abstracts are embargoed until 12:01 a.m. PDT, Wednesday Oct. 4th with the exception of research findings presented at the IDWeek press conferences.