How molecular biology is changing the diagnosis of respiratory infections in critically ill patients
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1 How molecular biology is changing the diagnosis of respiratory infections in critically ill patients Ricardo Serrano PhD. MD Department of Intensive Care Medicine General University Hospital of Alicante (Spain)
2 Inappropiate initial antibiotic therapy Excess morbidity and mortality Excessive antibiotic therapy Antibiotic resistance
3 Need for new microbiological diagnosis methods in respiratory infections TIME OF MICROBIOLOGICAL IDENTIFICATION TIME OF RESISTANCE PATTERN TIME TO CPIS 6 (VAP)
4 Microbiology VAP. Envin-Helics 2013 Source: ENVIN-HELICS report 2013
5 Am J Respr Crit Care 2003; 168: 173
6 Gram + Culture Serology Antigen detection VAP Microb Diagnosis MOLECULAR BIOLOGY
7 TRICORDER SCAN
8 Clinical aplications of molecular diagnosis Resistance Identification Molecular diagnosis VAP Quantification
9 Timothy F. Murphy Thorax 1990; 42:
10 Molecular Diagnosis in respiratory infections Real-time PCR FISH, FilmArrays Mass spectrometry
11 Angela M. Caliendo et al. CID 2013; 57 (Suppl 3): S139-S170
12 Single assay from unprocessed clinical Nucleic acid purification Reverse transcription PCR amplification Melting curve analysis sample
13 S. aureus identification Bacterial identification: MSSA and MRSA a) real-time PCR b) real-time PCR + hibridization probe VanA/VanB genes Time: 1-2 hours DNA targets: - specific genes - SSCmec - orf X region In reference to culture Sensibility: 75-85% Specificity: 94-96% Neg. Pred. Value: 99%
14 Hassan H, Shorman M. Int J Microbiology 2011
15 Cercenado E. J. Clin. Microbiol 2012; 50 (12):
16
17 Real-time PCR: HAP/VAP P. aeruginosa / A. baumanii Staphylococcus aureus / meca S. aureus / Panton-Valentine Leukocidin Kit PASM (Pseudomonas, Acinetobacter, Staphylococcus aureus, MecA)
18 Real-time PCR: specific situations CAP Flu outbreaks Inmunosupression Neumolysin. (Strep. pneumoniae) Mycoplasma / Chlamydia pneumoniae Legionella spp. / L. pneumophila Influenza virus A/B (H1N1,H1,H3) M. tuberculosis Complex/ R INH y RIF A. fumigatus, P. jiroveci Influenza virus A/B (H1N1,H1,H3) CMV, EBV, HSV 1and 2, VZV Infants Syncytyal respiratory virus (SRV)
19 Real-time PCR: RESISTANCE DETECTION Kit CTXE(ESBL): CTX-M groups 1, 2 and 9 Kit KPCK (CKP) Kit IMVI: MBL, IMP/VIM Kit AMPC: AmpC plasmidic betalactamase AnyPlex: Van A, Van B, Van C MagicPlex: Van A, Van B, Van C
20 Past Limitations Low cost Not especial trained perssonel Low risk contamination Easy interpretation of results Real-time PCR Increased cost Trained personnel Risk of contamination Lack of validation of some assays Complex interpretation of results Actual Strengths
21 MALDI-TOF (MS) (Matrix-Assisted Laser Desorption/Ionization- Time-Of-Flight)
22 MALDI-TOF (MS) (Matrix-Assisted Laser Desorption/Ionization- Time-Of-Flight) Protein analisis (mainly ribosomal proteins) Mass range to Da Microbial identification of cultured isolates Rapid identification method (minutes) Working in extend utilities: Bacterial identification from clinical samples Antibiotic resistance Typing different microorganisms Identification Fungal, mycobacterium, viruses
23 Wang Ye Ri et al. Biomed Environ Sci, 2013; 26 (6):
24 Yun Fong Ngeow et al. Sensors 2013,13, Michelle Pignone et al. J Clin Microb 2006; 44 (6): Chalupova et al. Biotecnology Advances 2013: in press
25 Reiner Schaumann et al. Med Sci Monit 2012 ; 18 (9): MT71-77
26 Johansson et al. BMC Microbiology 2014: 14-89
27 Johansson et al. BMC Microbiology 2014: 14-89
28 Antonella Mencacci et al. J Clin Microb 2013; 51 (2):
29 MALDI-TOF (MS): Limitations Low analytical sensibility utility (from growth colonies or sediment from blood culture) High cost of equipment and maintenance No cost/effective if < identifications/year Need of positive/negative and calibration controls Regulatory issues. Difficulties to discriminate filogenetic similar microorganisms Difficult diagnosis of polimicrobial infections Low possibility of toxins identification Not authorities approval
30 Molecular diagnosis at General University Hospital of Alicante (Spain) QUANTITATIVE REAL TIME PCR : CMV, EBV QUALITATIVE REAL -TIME PCR: HSV 1 and 2, VZV, Influenza A (H1/N1)/ B, MSSA/MRSA, Bordetella pertusis, Mycobacterium tuberculosis MALDI-TOF MS: Bacteria/Fungal
31 MALDI-TOF MS in respiratory infection at GUHA (Spain) < 2 h: Gram stain from respiratory sample 24 h: MALDI-TOF identification 48 h: antibiogram C P I S
32
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