A population-based study of Streptococcus suis infections in humans in Phayao Province in the northern Thailand - An epidemiological study of Streptococcus suis infections in Thailand

A prospective study of S. suis infections in humans was conducted in Phayao Province, in the northern Thailand to determine the incidence and the transmission mode of this disease in this region in 2010. Thirty-one cases with the case fatality rate of 15.6% were confirmed, and the estimated incidence in this year was 6.2 per 100000 in the general population in 2010. A peak incidence was found in May of 2010. The median age of patients were 53 and the male sex was 64.5%. Consumption of raw pork products was confirmed in 22 cases and the median incubation period (range) was 2 (0-11) days after consumption of raw pork products. Isolates from 31 cases were serotype 2 for 23 cases (74.2%) and serotype 14 for 8 cases (25.8%). The major sequence types (STs) found were ST1 (n=20) for serotypes 2 and ST105 (n=8) for serotype 14.