Target product profiles for diagnosis of sepsis: Proposing a new approach for diagnostic innovation

Background & objectives: Sepsis, including neonatal sepsis, remains a prevalent cause of morbidity and mortality in low- and middle-income countries such as India, representing 85 per cent of all sepsis-related deaths globally. Early diagnosis and timely initiation of treatment is challenging due to non-specific clinical manifestations and non-availability of rapid diagnostic tests. There is an urgent need for affordable diagnostics with fast turnaround time catering to the needs of end-users. Target product profiles (TPPs) have been found instrumental in developing ‘fit-for-use’ diagnostics, thus reducing the time taken to facilitate development and improving diagnosis. Hitherto, no such guidance or criteria has been defined for rapid diagnostics for sepsis/neonatal sepsis. We propose an innovative approach for developing the diagnostics for sepsis screening and diagnosis which can be utilized by diagnostic developers in the country. Methods: Three-round Delphi method, including two online surveys and one virtual consultation, was adopted to define criteria for minimum and optimum attributes of TPPs and build consensus on characteristics. Expert panel (n=23) included infectious disease physicians, public health specialists, clinical microbiologists, virologists, researchers/scientists and technology experts/innovators. Results: We present a three-component product profile for sepsis diagnosis, (i) screening with high sensitivity, (ii) detection of aetiological agent, and (iii) profiling of antimicrobial susceptibility/resistance, in adults and neonates with an option of testing different considerations. An agreement of >75 per cent was achieved for all TPP characteristics by Delphi. These TPPs are tailored to the Indian healthcare settings and can also be extrapolated to other resource-constraint and high-disease burden settings.

Susceptibility testing for aztreonam plus ceftazidime/avibactam combination: A general guidance for clinical microbiology laboratories in India

Metallo beta-lactamases-producing Gram-negative infection is often challenging and there is no defined treatment option. In recent years, the combination of aztreonam with ceftazidime-avibactam has gained much clinical attention mainly for MBL-producing Enterobacterales, while MBL-producing P. aeruginosa and A. baumannii are likely to be resistant. A consensus susceptibility testing method for this triple combination has yet to be recommended. Various methods such as broth disk elution, disk stacking, gradient strip stacking, and strip crossing have been proposed for testing this combination. Among them, broth disk elution and strip based testing methods showed good correlation with the broth micro-dilution method.

Clostridium Difficile is associated with High Mortality among Cirrhotics in India

Background: To assess the prevalence and impact of Clostridium difficile infection (CDI) in hospitalized patients with cirrhosis in India. Methods: In this prospective observational study from June 2015 to March 2016, all hospitalized patients with cirrhosis and acute diarrhea at the time of admission or during hospitalization were included. We studied hospitalized patients with cirrhosis without diarrhea during the same period to detect asymptomatic colonizers.Stool samples were tested for CDI, bacterial cultures, and parasite microscopy in patients with diarrhea.CDI was detected using a stool PCR test that detects the pathogenicity locus of toxigenic Clostridium difficile gene. We analysed the impact of CDI on hospital outcomes and also assessed the risk factors for acquiring CDI. Result: Among 92 hospitalized cirrhotic patients with acute diarrhea [male: 74; median age: 50 (range 19 to 80) years; Child’s class A: B: C: 8:41:43; median MELD score: 18 (range 6 to 44)], 6 (6.5%) had CDI by positive stool PCR. Use of antibiotics (100% CDI Vs 55.8% non-CDI, p= 0.04) and steroids (50% CDI vs 10.5% non-CDI, p =0.028) emerged as risk factors for CDI among cirrhosis patients. Two of the 6 patients (33.3%) with CDI as compared to 6/86 patients (7%) with no CDI died (p-value: 0.08).There were no asymptomatic colonizers amongst 35 hospitalized cirrhosis patients without diarrhea.Conclusions: C. difficile, although uncommon, was an important cause of mortality in cirrhosis patients hospitalized with diarrhea in India.Prior use of antibiotics or steroids were identified as risk factors for CDI.

Antimicrobial susceptibility and serotypes of Neisseria meningitidis and Streptococcus pneumoniae in Sri Lanka: Experience from the National Reference Laboratory

@# Objective: To determine the antimicrobial susceptibility and serotypes of Neisseria (N.) meningitidis and Streptococcus (S.) pneumoniae in Sri Lankan patients. Methods: We retrospectively analyzed 11 blood culture specimens from suspected patients with invasive meningococcal disease and 26 S. pneumoniae clinical isolates. We tested 6 antimicrobials against N. meningitidis and 12 antimicrobials against S. pneumoniae. Meningococcal serogroup was determined by realtime PCR and Quellung serotyping was used for pneumococcal analysis. Results: N. meningitidis serogroup B was the most common in this study. Intermediate-susceptibility to penicillin was seen in 75.0% (6/8) of strains. Susceptibility to ciprofloxacin, levofloxacin and cotrimoxazole was 62.5% (5/8), 62.5% (5/8) and 87.5% (7/8), respectively. Excellent susceptibility was seen in cefotaxime and meropenem. In S. pneumoniae, the most common serotype was 19F in both invasive and non-invasive pneumococcal diseases. The majority of strains showed multidrug resistance. Penicillin non-susceptibility in non-meningeal strains were 13.6% and all meningeal strains were penicillin resistant. Erythromycin was highly resistant in both groups. Amoxicillin showed excellent susceptibility in non-invasive pneumococcal diseases strains. Linezolid, levofloxacin and vancomycin showed 100.0% susceptibility in all pneumococcal isolates. Conclusions: Implementation of vaccines should be considered, especially for children and high-risk populations. This may contribute to reducing pneumococcal and meningococcal invasive disease burden and help prevent emergence of antimicrobial resistant strains.

Antimicrobial susceptibility and serotypes of Neisseria meningitidis and Streptococcus pneumoniae in Sri Lanka: Experience from the National Reference Laboratory

Objective: To determine the antimicrobial susceptibility and serotypes of Neisseria (N.) meningitidis and Streptococcus (S.) pneumoniae in Sri Lankan patients. Methods: We retrospectively analyzed 11 blood culture specimens from suspected patients with invasive meningococcal disease and 26 S. pneumoniae clinical isolates. We tested 6 antimicrobials against N. meningitidis and 12 antimicrobials against S. pneumoniae. Meningococcal serogroup was determined by realtime PCR and Quellung serotyping was used for pneumococcal analysis. Results: N. meningitidis serogroup B was the most common in this study. Intermediate-susceptibility to penicillin was seen in 75.0% (6/8) of strains. Susceptibility to ciprofloxacin, levofloxacin and cotrimoxazole was 62.5% (5/8), 62.5% (5/8) and 87.5% (7/8), respectively. Excellent susceptibility was seen in cefotaxime and meropenem. In S. pneumoniae, the most common serotype was 19F in both invasive and non-invasive pneumococcal diseases. The majority of strains showed multidrug resistance. Penicillin non-susceptibility in non-meningeal strains were 13.6% and all meningeal strains were penicillin resistant. Erythromycin was highly resistant in both groups. Amoxicillin showed excellent susceptibility in non-invasive pneumococcal diseases strains. Linezolid, levofloxacin and vancomycin showed 100.0% susceptibility in all pneumococcal isolates. Conclusions: Implementation of vaccines should be considered, especially for children and high-risk populations. This may contribute to reducing pneumococcal and meningococcal invasive disease burden and help prevent emergence of antimicrobial resistant strains.

Non-vaccine Pneumococcal Serotypes Among Children with Invasive Pneumococcal Disease

Objective: To report the percentage of non-vaccine pneumococcal serotypes and theirantibiotic susceptibility pattern in children with invasive peumococcal disease. Methods:Invasive pneumococcal isolates of children <5 years during January 2007 to December2016 were serotyped by a co-agglutination reaction and sequential multiplex polymerasechain reaction. Results: Among the total 170 S. pneumoniae invasiveisolates, 54 (31.8%)and 44 (25.9 %) were the serotypes, which are not included in current 10-valent or 13-valent vaccines, respectively. Very low resistance was observed against penicillin (4.5%)and all isolates were susceptible to cefotaxime. Conclusions: One-fourth to one-third ofthe S. pneumoniae serotypes in under-five children with invasive pneumococcal diseaseare not covered by existing pneumococcal vaccines in India.

Advantage and limitations of nitrofurantoin in multi-drug resistant Indian scenario.

Infections caused by antibiotic resistant pathogens are of significant concern and are associated with higher mortality and morbidity. Nitrofurantoin is a broad-spectrum bactericidal antibiotic and is effectively used to treat urinary tract infections (UTIs) caused by E. coli, Klebsiella sp., Enterobacter sp., Enterococcus sp. and Staphylococcus aureus. It interfere with the synthesis of cell wall, bacterial proteins and DNA of both Gram positive and Gram negative pathogens. Nitrofurantoin has been used successfully for treatment and prophylaxis of acute lower urinary tract infections. With the emergence of antibiotic resistance, nitrofurantoin has become the choice of agent for treating UTIs caused by multi-drug resistant pathogens.

Antimicrobial Susceptibility Profile of Isolates from Pediatric Blood Stream Infections.

We describe the pathogens and their antimicrobial profile causing blood stream infections in children over a 4-year period. The commonest pathogens were: non-fermenting Gram negative bacilli other than Pseudomonas, Salmonella species, Escherichia coli, Staphylococcus aureus and Klebsiella species. High rates of drug-resistance were observed.

ICMR programme on Antibiotic Stewardship, Prevention of Infection & Control (ASPIC).

Antimicrobial resistance and hospital infections have increased alarmingly in India. Antibiotic stewardship and hospital infection control are two broad strategies which have been employed globally to contain the problems of resistance and infections. For this to succeed, it is important to bring on board the various stakeholders in hospitals, especially the clinical pharmacologists. The discipline of clinical pharmacology needs to be involved in themes such as antimicrobial resistance and hospital infection which truly impact patient care. Clinical pharmacologists need to collaborate with faculty in other disciplines such as microbiology to achieve good outcomes for optimal patient care in the hospital setting. The ASPIC programme was initiated by the Indian Council of Medical Research (ICMR) in response to the above need and was designed to bring together faculty from clinical pharmacology, microbiology and other disciplines to collaborate on initiating and improving antibiotic stewardship and concurrently curbing hospital infections through feasible infection control practices. This programme involves the participation of 20 centres per year throughout the country which come together for a training workshop. Topics pertaining to the above areas are discussed in addition to planning a project which helps to improve antibiotic stewardship and infection control practices in the various centres. It is hoped that this programme would empower hospitals and institutions throughout the country to improve antibiotic stewardship and infection control and ultimately contain antimicrobial resistance.

Prospective multi-centre sentinel surveillance for Haemophilus influenzae type b & other bacterial meningitis in Indian children.

Background & objectives: Haemophilus influenzae type b (Hib) is one of the leading bacterial causes of invasive disease in populations without access to Hib conjugate vaccines (Hib-CV). India has recently decided to introduce Hib-CV into the routine immunization programme in selected States. Longitudinal data quantifying the burden of bacterial meningitis and the proportion of disease caused by various bacteria are needed to track the impact of Hib-CV once introduced. A hospital-based sentinel surveillance network was established at four places in the country and this study reports the results of this ongoing surveillance. Methods: Children aged 1 to 23 months with suspected bacterial meningitis were enrolled in Chennai, Lucknow, New Delhi, and Vellore between July 2008 and June 2010. All cerebrospinal fluid (CSF) samples were tested using cytological, biochemical, and culture methods. Samples with abnormal CSF (≥10 WBC per μl) were tested by latex agglutination test for common paediatric bacterial meningitis pathogens. Results: A total of 708 patients with abnormal CSF were identified, 89 of whom had a bacterial pathogen confirmed. Hib accounted for the majority of bacteriologically confirmed cases, 62 (70%), while Streptococcus pneumoniae and group B Streptococcus were identified in 12 (13%) and seven (8%) cases, respectively. The other eight cases were a mix of other bacteria. The proportion of abnormal CSF and probable bacterial meningitis that was caused by Hib was 74 and 58 per cent lower at Christian Medical College (CMC), Vellore, which had a 41 per cent coverage of Hib-CV among all suspected meningitis cases, compared to the combined average proportion at the other three centres where a coverage between 1 and 8 per cent was seen (P<0.001 and P= 0.05, respectively). Interpretation & conclusions: Hib was found to be the predominant cause of bacterial meningitis in young children in diverse geographic locations in India. Possible indications of herd immunity was seen at CMC compared to sites with low immunization coverage with Hib-CV. As Hib is the most common pathogen in bacterial meningitis, Hib-CV would have a large impact on bacterial meningitis in Indian children.

Prevalence of Extendedspectrum β-lactamase Producing Escherichia coli and Klebsiella spp in a Neonatal Intensive Care Unit.

This study reports the prevalence of extended-spectrum β- lactamase producing Escherichia coli and Klebsiella spp among septicemic neonates. Over a five year period, there were 94 isolates of Klebsiella spp and E .coli. Of these, 68 (72.3%) were ESBL producers. Forty (80%) of the Klebsiella spp isolates produced ESBL as compared to 28 (63.6%) of E.coli.