Population Biology Of Zoonotic Streptococcus Suis In The Production And Supply Chain Of Pork In China | 17886
Epidemiology: Open Access
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(SS) is an important zoonotic pathogen of pigs with global relevance to pig productivity and human health.
Human SS disease was first described in the 1950s in Europe, but current interest lies in the role of SS in outbreaks of toxic
shock-like syndrome in China and in meningitis in Vietnam,Thailand and Hong Kong. Most human gets infected with SS
through close contact with the production and supply chain of pork. Strategies for SS control are needed to protect human
health and to reduce dependence of pig production on antimicrobials.
To identify control points for the prevention of SS related disease in pigs and humans, longitudinal studies on tonsil
samples were collected from10 pig farms, and on consumer-ready pig-meat samples from small abattoirs, wet- and super-
markets were performed. 211 SS isolates have been identified from 500 tonsil swabs of healthy pigs. PCR-based most-probable
number (MPN) was used to evaluate the SS contamination in the meat samples.The contamination rate was up to 90% in the
samples from small abattoirs, higher than that from wet- and super-markets (84% vs. 70%). The concentration of SS ranged
from 0 to 1100 MPN/g of meat, kidney and intestine, and 0 to 35 MPN/g of liver from the small abattoirs. It was much lower
in the meat (0 to 15 MPN/g) and liver (0 to 460 MPN/g) from the wet-and super-markets. The antimicrobial resistance profile
(for 23 kinds of antibacterial drugs) was investigated. All the isolates displayed resistance to 3-14 drugs. The biochemical
reaction profiles and serotypes of the isolates are currently being characterized. Whole genome sequences of the isolateswill
be compared to those obtained from pig meat products and those available from human isolates. Risk factors for carriage of
SS on consumer-ready pig-meat will be investigated. The genes that underpin environmental survival of SS in the context of
farm, abattoir and meat products will be identified by using transposon directed insertion site sequencing (TraDIS).This shall
provide guidance to new control points for disease prevention by shedding light on strain diversity, fitness, and antimicrobial
resistance along the production and supply chain.
Rui Zhou got his PhD from the University of Munich Germany in 2003.Currently he is the professor of Veterinary Bacteriology & Infectious Diseases, the Dean of
Department of Preventive Veterinary Medicine, and the Director of Laboratory Animal Center, Huazhong Agricultural University, the Vice-director of Key Laboratory
of Veterinary Diagnosis, Ministry of Agriculture of China, and the chief scientist of the National Basic Research Program of China.He has published more than
50 papers in international journals, and developed and commercialized two veterinary vaccine and diagnostic kit. This work is supported by the National Basic
Research Program of China (2012CB518802), and the International S &
T Cooperation Program of China (2013DFG32360).
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