1627. Outbreaks of Klebsiella pneumoniae in Special Care Nurseries (SCN) in Jamaica: Role of Whole-Genome Sequencing

Abstract Background Klebsiella pneumoniae is a frequent cause of neonatal sepsis and carries a high mortality rate in lower and middle-income countries (LMICs). From March-November 2015, two Jamaican hospitals experienced K. pneumoniae outbreaks in their Special Care Nurseries (SCNs). New admissions to both SCNs were temporarily halted while additional infection control strategies were implemented. 31 babies were infected, of which 15 died. International collaboration was requested to help investigate if the sepsis cases were nosocomial transmission, repeated introductions from the community, or both using whole-genome sequencing Methods We sequenced DNA from 19 outbreak isolates (n = 13 from Hospital A, n = 6 from Hospital B) on an Illumina HiSeq2500 instrument and assembled short-reads using SPAdes. We used ResFinder v3.1.0 to screen resistance genes and assigned MLSTs using in-house scripts. To compare the outbreak isolates, we selected a reference genome from among the assembled isolates, aligned raw reads using the Burrows–Wheeler Aligner (BWA), identified SNPs using GATK UnifiedGenotyper, and removed the recombined regions using Gubbins v2.3.4. We further contextualized the 19 outbreak isolates against a global collection of more than 300 K. pneumoniae genomes. Results All 13 isolates from Hospital A appeared to be from a single source. All were ST45 and encoded blaCTX-M-15, which confers extended-spectrum β-lactam (ESBL) resistance. Five of 6 isolates from Hospital B appeared to be from a separate, single source. These 5 isolates were ST268 and susceptible to most antibiotics. 1 isolate from Hospital B was ST628, encoded blaCTX-M-15, and grouped separately from other Hospital B outbreak isolates. Hospital A and B outbreak isolates formed independent, unique clades within a global K. pneumoniae collection. Conclusion Our findings indicate nosocomial transmission was responsible for both neonatal K. pneumoniae outbreaks, rather than repeat introductions from the community. The main sequence types we detected (ST45 and ST268) are not known pandemic clones and may circulate regionally. Multifaceted infection control measures were implemented for effectively halting outbreaks. Disclosures All authors: No reported disclosures.