Streptococcus suis in retail markets: How prevalent is it in raw pork?

Cheung, Pui-Yi; Lo, Kin Land; Cheung, To To; Yeung, Wai Hing; Leung, Pui Ha; Kam, Kai Man

doi:10.1016/j.ijfoodmicro.2008.08.006

Cited by 30 publications

(18 citation statements)

References 22 publications

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“…However, Cheung et al (2008) previously described a relationship between S. suis contamination and TBC in Hong Kong. We speculated that differences exist in food hygiene conditions and retail markets between Hong Kong and Japan.…”

Section: Discussionmentioning

confidence: 94%

“…Therefore, these findings suggest that the ST25 complex is another clonal group that needs to be considered due to its importance in human infection. Previous studies reported S. suis contamination in pork meat (Cheung et al, 2008;Ip et al, 2007), but did not specify the degree of virulence that may have been hazardous to humans. In recent studies, there are scientific evidences that S. suis is hazardous to humans and it can be considered a new zoonotic food-borne pathogen (Nghia et al, 2011;Pachirat et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…In Viet Nam and Thailand, some people consume undercooked pork including organs, resulting in many patients having S. suis infection described above (Nghia et al, 2011;Pachirat et al, 2012). Furthermore, S. suis was isolated from or detected in raw pork meat sold in markets in Hong Kong (Cheung et al, 2008;Ip et al, 2007). This finding suggests that raw pork meat can be a source of human infection and the threat of S. suis to food safety needs to be recognized.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of loop-mediated isothermal amplification to detect Streptococcus suis and its application to retail pork meat in Japan

Arai

Tohya

Yamada

et al. 2015

International Journal of Food Microbiology

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of loop-mediated isothermal amplification to detect Streptococcus suis and its application to retail pork meat in Japan

Arai

Tohya

Yamada

et al. 2015

International Journal of Food Microbiology

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“…A recent study of S. suis serotype 2 infection reported that slaughterhouse pigs were the source of infection by S. suis serotype 2 in southern Vietnam [22]. A previous study in Hong Kong reported that an increase in bacterial density of S. suis in raw pork meats in wet markets occurs in hot and humid climates [23]. Collectively, the poor quality of food safety control for raw pork products at the slaughterhouses and the wet markets in this region are likely to provide the sources of this infection.…”

Section: Discussionmentioning

confidence: 99%

Population-Based Study of Streptococcus suis Infection in Humans in Phayao Province in Northern Thailand

Takeuchi

Kerdsin

Pienpringam³

et al. 2012

PLoS ONE

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Background Streptococcus suis infection in humans has received increasing worldwide recognition.Methods and FindingsA prospective study of S. suis infection in humans was conducted in Phayao Province in northern Thailand to determine the incidence and the risk behaviors of the disease in this region in 2010. Thirty-one cases were confirmed. The case fatality rate was 16.1%, and the estimated incidence rate was 6.2 per 100,000 in the general population. The peak incidence occurred in May. The median age of the patients was 53 years and 64.5% were men. Consumption of raw pork products was confirmed in 22 cases and the median incubation period (range) was 2 days (0–11) after consumption of raw pork products. Isolates from 31 patients were confirmed as serotype 2 in 23 patients (74.2%) and serotype 14 in eight patients (25.8%). The major sequence types (STs) were ST1 (n = 20) for serotype 2 and ST105 (n = 8) for serotype 14. The epidemiological analysis suggested three possible clusters, which included 17 cases. In the largest possible cluster of 10 cases in Chiang Kham and its neighboring districts in May, the source of infection in four cases was identified as a raw pork dish served at the same restaurant in this district. Microbiological analysis confirmed that three of four cases associated with consumption of raw pork at this restaurant were attributable to an identical strain of serotype 2 with ST1 and pulsotype A2.ConclusionsOur data suggest a high incidence rate of S. suis infection in the general population in Phayao Province in 2010 and confirm a cluster of three cases in 31 human cases. Food safety control should be strengthened especially for raw pork products in northern Thailand.

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“…Moreover, the unsafe habit of purchasing pork in flea markets and the consumption of undercooked animal products are well-established risk factors for acquiring many infectious diseases, especially S. suis serotype 2 from pigs [6,8]. A recent study from Hong Kong reported heavy contamination of raw pork meat at local supermarkets or wet markets with S. suis; therefore, hot and humid climates may facilitate the growth of S. suis in raw pork products [3].…”

Section: Discussionmentioning

confidence: 99%

Molecular diagnostics and ITS-based phylogenic analysis of Streptococcus suis serotype 2 in central Vietnam

Nguyen

Phan

Nguyen

et al. 2015

J Infect Dev Ctries

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Introduction: Streptococcus suis (S. suis) serotype 2 has recently become the most prevalent cause of meningitis in adults in many areas of Vietnam. This study provides data on S. suis molecular diagnosis in central Vietnam using a real-time polymerase chain reaction (PCR) assay targeting the S. suis serotype 2 cps2J gene. Additionally, 16S-23S rDNA intragenic spacer (ITS)-based phylogenic analysis of strains isolated from cerebrospinal fluid (CSF) in Thua Thien Hue Province, Vietnam, is presented and discussed. Methodology: Pathogenic bacteria were isolated from 40 CSF samples, and 18 were identified as S. suis by culture-dependent methods. Capsular serotyping was assessed by real-time PCR. ITS sequences were obtained after traditional PCR and were used in phylogenic analyses. Results: Pathogenic bacteria were isolated from 36 out of 40 CSF samples. A total of 18 S. suis strains were isolated and assigned to serotype 2 by real-time PCR. One CSF sample, negative when tested by culture-dependent methods, was positive to S. suis serotype 2 by real-time PCR. Pairwise alignments of the 18 ITS sequences did not reveal any variable nucleotide position, and resulted in a single sequence type. Sequences were similar to S. suis serotype 2 reference ITS sequences (> 98.1%), and there was no lack of an ITS spacer region in the isolates. Conclusions: S. suis serotype 2 is the most prevalent serotype in central Vietnam. Real-time PCR assay proved to be a reliable diagnostic method for early detection of S. suis 2 in CSF samples.

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Streptococcus suis in retail markets: How prevalent is it in raw pork?

Cited by 30 publications

References 22 publications

Development of loop-mediated isothermal amplification to detect Streptococcus suis and its application to retail pork meat in Japan

Development of loop-mediated isothermal amplification to detect Streptococcus suis and its application to retail pork meat in Japan

Population-Based Study of Streptococcus suis Infection in Humans in Phayao Province in Northern Thailand

Molecular diagnostics and ITS-based phylogenic analysis of Streptococcus suis serotype 2 in central Vietnam

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