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Streptococcus suis (S. suis) is a major public health problem in northeastern Thailand. On 17 Apr 2018, the Office of Disease Prevention and Control 9 received a notification of five patients with S. suis infection in Chum Phuang District, Nakhon Ratchasima Province. We investigated to confirm the etiology, describe the epidemiological characteristics, and identify the source of this outbreak. Medical records and laboratory results at the district and provincial Hospitals were reviewed. We interviewed family members and people who shared meals with cases. We surveyed slaughter processes at two implicated slaughterhouses. Surveillance for S. suis cases was also enhanced. Six confirmed cases of S. suis serotype 2 infection were found in six sub-districts of Chum Phuang District between 1 Jan and20 Apr 2018. Clinical presentations of confirmed cases were fever (100%), headache (50%) and hearing loss (50%). Five of the six cases ate raw pork with an average incubation period of 2.3 days. Those who ate raw pork were more likely to get infected (RR = 13.5, 95% CI = 1.7-105.1). One from 27 specimens identified S. suisserotype7 from a slaughterhouse in Chum Phuang District. The outbreak continued with an additional 14 confirmed cases in province during the monitoring period from 20 Apr to 25 Jul 2018. Increasing health awareness of the public and physicians beyond ensuring proper management in slaughterhouses should be strengthened.
Keywords: Streptococcus suis, zoonosis, outbreak, raw pork, slaughterhouses, Thailand
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