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Title Here Evaluation of the Film Array Respiratory Panel for Detection of Mycoplasma pneumoniae and Respiratory Viruses in Multiple Specimen Types Christine.

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Presentation on theme: "Title Here Evaluation of the Film Array Respiratory Panel for Detection of Mycoplasma pneumoniae and Respiratory Viruses in Multiple Specimen Types Christine."— Presentation transcript:

1 Title Here Evaluation of the Film Array Respiratory Panel for Detection of Mycoplasma pneumoniae and Respiratory Viruses in Multiple Specimen Types Christine Robinson 1, Kristin Pretty 1, Daniel Olson 2, and Samuel Dominguez 2 Departments of Pathology and Laboratory Medicine 1 and Pediatrics 2, Children’s Hospital Colorado 1,2 and University of Colorado 2, Anschutz Medical Campus, CO BACKGROUND OBJECTIVES METHODS RESULTS CONCLUSIONS ORGANISM AND SIGNIFCANCE Mycoplasma pneumoniae (Mp) is a bacterial cause of community-acquired pneumonia and occasional extra-pulmonary disease in school-age children and young adults. Most cases are mild but some are hospitalized. Stevens Johnson Syndrome (SJS), a rare but serious disorder involving skin and mucous membranes usually triggered by medication, can also be induced by Mp. Circulation usually is endemic, but outbreaks can occur. Throat swabs (TS) are the usual specimen sent to detect Mp by PCR. OUTBREAK An outbreak of Mp-associated respiratory disease and unusual cluster of Mp- associated SJS was identified in Denver-area children in late 2013, prompting an on-site investigation by CDC. Most of these infections were detected by the Film Array Respiratory Panel (FA RP, Biofire Diagnostics), an FDA-cleared PCR for 17 respiratory viruses and 3 bacteria in nasopharyngeal swabs (NPS). Specimens other than NPS were Mp-positive, although we had not yet validated reporting of bacteria from this test. Other cases were detected by Mp PCR of TS at Focus Diagnostics Laboratory. Hospitalized child with severe SJS skin and eye involvement M. pneumoniae Scanning electron micrograph. Organisms in FA Respiratory Panel Viruses Bacteria Influenza A, H1, H1 2009, H3 Mycoplasma pneumoniae Influenza B Chlamydophila pneumoniae RSV Bordetella pertussis Human metapneumovirus Adenovirus Parainfluenza 1-4 Coronaviruses 229E, OC43, HKU1, NL63 Rhinovirus/enterovirus Film Array System Describe a clinical validation of FA for detection of respiratory viruses and Mp in multiple specimen types including NPS, nasopharyngeal washes (NPW), tracheal aspirates (TA), and bronchoalveolar lavage (BAL), using specimens collected during a Mp outbreak. RESPIRATORY VIRUS VALIDATION: Banked or fresh NPW, TA, and BAL positive by Luminex Respiratory Virus Panel (LUM, IUO version), donated LUM-positive NPS, and negative specimens spiked with virus were combined into 2-specimen pools and tested by FA v1.6. The number of expected and observed analytes for each pool was scored. Mp – CLINICAL VALIDATION: 288 banked or fresh respiratory specimens positive or negative for Mp by FA were sent to the CDC’s Mycoplasma Laboratory only (19 pos), Focus Reference Laboratory (16 pos, 203 neg), or both laboratories (50 pos) for Mp PCR. Mp strain typing by MLVA and resistance testing was performed at CDC. Mp – ANALYTICAL VALIDATION: In progress FILM ARRAY RESP. PANEL - TESTING OF MULTIPLE SPECIMEN TYPES FOR VIRUS 20 NPS45 NPW40 TA40 BAL Luminex RVP*Luminex RVP** PosNegTotalPosNegTotalPosNegTotalPosNegTotal Film Array RP Pos Neg Total Discrepancy Missed 1 AdV Detected 1 add'l RV FA missed 1 AdVNone Sensitivity96%98.70%100% Specificity99.80%99.10%100% Agreement99.50%98.90% 100% MYCOPLASMA PNEUMONIAE A.Film Array RP Detects Outbreak Use of FA for respiratory virus detection begins in early 2013; bacteria to be validated later. If Mp detected, specimen sent to Focus for confirmation before reporting. Mp detection increases significantly in autumn. B.Association of MP with SJS Link between SJS and Mp observed. CDC investigates on-site; verifies community-wide Mp outbreak and association of Mp with some SJS cases.  7 Mp-associated probable SJS cases identified Aug-Nov 2013; 5 considered confirmed. All had severe disease; several had recurrent disease.  3 different strains of Mp were circulating; no single strain was identified in SJS patients  All 4 Mp from SJS patients were macrolide sensitive; 7% of 45 Mp from non-SJS patients and contacts were resistant. All FA Results; Feb 2013-Feb 2014 FILM ARRAY RESP. PANEL - TESTING OF MULTIPLE SPECIMEN TYPES FOR MP RESULTS Confirmatory Mp PCR ( CDC and/or Focus) Same Specimen as FADifferent Specimen as FA PosNegTotalPosNegTotal Film Array RP Pos Neg Total Sensitivity100%100.00% Specificity96.70%97.70% Agreement98.00%98% Film Array RP Specimen TypesMp PosTestedPos Rate FDA Cleared NPS % Lab-Validated NW % BAL % TA % Other % Total76 * % Total Tested85 * % * 89% of Mp FA positives were in lab-validated specimens C. Agreement between CDC and Focus Mp PCRs A. Mp Detected in Many Specimen Types A. Many Specimen Types Testable B. Validation of FA-RP vs. Luminex RVP B. Validation of FA-RP Mp PCR vs. Other PCRs  88% agreement when the same 50 FA-positive specimens tested by both laboratories  83% positive agreement when different FA-positive specimens from the same patient tested  CDC PCR identified 4 Mp-positive specimens resulted as Mp negative at Focus; Focus detected no additional positives.  Specimens other than NPS can be tested for viruses by Film Array RP and resulted with confidence  Detection of bacteria compared to viruses in respiratory tract specimens of children is low  An outbreak of Mp tract disease identified by Mp PCR of respiratory tract specimens occurred in late 2013 in Denver area children. Some cases were associated with Stevens-Johnson Disease  Clinical detection of M. pneumoniae by Film Array RP was validated in multiple specimen types * IVD version **RUO version Evaluation of the Film Array Respiratory Panel for Detection of Mycoplasma pneumoniae and Respiratory Viruses in Multiple Specimen Types Christine Robinson 1, Kristin Pretty 1, Daniel Olson 2, and Samuel Dominguez 2 Departments of Pathology and Laboratory Medicine 1 and Pediatrics 2, Children’s Hospital Colorado 1,2 and University of Colorado 2, Anschutz Medical Campus, CO


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