In Singapore, outbreaks of paratyphoid fever were mainly due to imported food. In 1979, there were 61 laboratory-confirmed S. Paratyphi A cases in an outbreak and imported fresh oysters were confirmed as the vehicles of transmission (51). The largest outbreak happened in 1996 where 167 cases of S. Paratyphi A infections were reported between February and May where imported de-shelled coconut was suspected as the vehicle of transmission (52). During the 19 years period (1990-2009), 2464 enteric fever cases were notified and among these cases, 707 were caused by S. Paratyphi A (259 indigenous cases and 448 imported cases) (53)..

Among the interventional techniques Taylor et al. [41] illustrated the cost effectiveness for spinal cord stimulation based on NICE criteria [58] at a cost of £5,624 per QALY. In contrast, Kumar and Rizvi [43], in an assessment of cost effectiveness of spinal cord stimulation therapy in management of chronic pain of failed back surgery syndrome, complex regional pain syndrome, peripheral arterial disease, and refractory angina pectoris, showed 2010 CAN ,293 CAN ,216, CAN ,350, and CAN ,984 for failed back surgery syndrome, complex regional pain syndrome, peripheral arterial disease, and refractory angina pectoris, respectively, per QALY gained. Overall cost utility analysis of caudal epidural injections, lumbar interlaminar epidural injections, and percutaneous adhesiolysis yielded favorable results in managing chronic low back pain of various pathologies [45-49]. Manchikanti et al. [47] performed a cost utility analysis of caudal epidural injections in the treatment of lumbar disc herniation, axial or discogenic low back pain, central spinal stenosis, and post lumbar surgery syndrome showing average direct procedure costs per one-year QALY of USD ,173 and USD ,628 of overall costs. Even though this study was limited to a single center, it included 480 patients in the analysis and data were derived from 4 separate randomized controlled trials (RCTs). Similarly, cost utility analysis of percutaneous adhesiolysis in managing pain of post lumbar surgery syndrome and lumbar central spinal stenosis was performed in a total of 130 patients after failure to response to caudal epidural injections from 2 RCTs from a single center showing direct procedural cost utility for one-year QALY of USD ,650 and overall cost of USD ,426 [48]. Manchikanti et al. [47] performed a cost utility analysis of lumbar interlaminar epidural injections with or without steroids in the treatment of lumbar disc herniation, central spinal stenosis, and discogenic or axial low back pain with data derived from 3 RCTs [59-61] that included a 2-year follow-up, with inclusion of 360 patients in this analysis. The methodology described in this manuscript was utilized with multiplication of procedural costs without medical therapy by a factor of 1.67 with overall cost per QALY of USD ,301 with direct costs of USD

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