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Objective To investigate the drug resistance of Salmonella and enterotoxin gene in diarrhea children of Taizhou.Methods 132 children with Salmonella infection who had fever ,diarrhea and other symptoms and were confirmed by fecal culture were selected .The Salmonella serotype , drug resistance analysis of 10 kinds of antibiotics,and enterotoxin gene (spvA,spvB,rck) were detected.Results 132 cases of Salmonella isolated from blood serological were identified a total of 10 serotypes,Salmonella typhimurium and Salmonella Enteritidis were the most common.In 132 strains of Salmonella ,the highest drug resistance rate was to ampicillin (51.82％) and ampicil-lin/sulbactam(51.52％),and had no resistance to imipenem ,ertapenem.In 132 strains of Salmonella,including sin-gle drug resistance of 27 strains(20.45％),the rest had two or more drugs resistance .In 132 strains of Salmonella, 132 strains were spvA positive(positive rate 100％),38 cases were spvB positive(positive rate 28.79％),45 cases were rck positive(positive rate 34.09％).The incidence rates of fever,dehydration and hematochezia in spvB positive children were significantly higher than those in spvB negative children (χ2 =6.022,6.661,6.978,all P<0.05).The incidence rates of fever and hematochezia in rck positive children were significantly higher than those in rck negative children (χ2 =9.134,12.673,all P<0.05).Conclusion Salmonella infection diarrhea children in the Taizhou area are mainly Salmonella typhimurium and Salmonella enteritidis infection ,the strains are highly resistant strains , enterotoxin spvB gene is correlated with the incidence rates of fever ,dehydration and hematochezia ,and rck gene is correlated with the incidence rates of fever and hematochezia .
RESUMO
A capacidade de produção de toxinas pelo Staphylococcus aureus no leite e produtos derivados está relacionado com surtos de intoxicação alimentar. Objetivou-se nesta pesquisa, estudar a ocorrência de genes que codificam para enterotoxinas estafilocócicas (sea, seb, sed, seg, seh e sei) e toxinas α e ß hemolítica (hla e hlb) em S. aureus isolados de 53 amostras de leite de tanques expansão comunitários no Estado de Alagoas, Brasil. Foram identificados 27 isolados (50,94%) como S. aureus pela amplificação do gene nuc. 13/27 isolados (48,1%) foram positivos para pelo menos um gene das enterotoxinas estudadas, sendo as frequências dos genes sea 33,3%, seh 18,5%, sei 11,1% e sed 7,4%; não entanto não foram identificados os genes seb e seg nestas bactérias. Para as toxinas hemolíticas, 51,9% dos isolados portavam ambos genes (hla e hlb), sendo a frequência para o gene hla de 81,5% e para o gene hlb de 51,9%. A frequência de genes das toxinas avaliadas é alta o que constitui um risco potencial para a saúde pública em especial, as enterotoxinas por serem termoestáveis e estarem asssociados com surtos de intoxicação alimentar.(AU)
The capacity of toxin production by Staphylococcus aureus in milk and dairy products is associated with food poisoning outbreaks. The objective of this research was to study the frequency of genes encoding staphylococcal enterotoxin (sea, seb, sed, seg, seh and sei) and α and ß hemolytic toxins (hla and hlb) in S. aureus isolates from 53 milk samples from community tanks in the State of Alagoas, Brazil. Twenty-seven isolates (50.94%) were identified as S. aureus by nuc gene amplification; 13/27 isolates (48.1%) were positive for at least one gene of the studied enterotoxins and the frequency of genes sea was 33.3%, seh 18.5%, sei 11.1% and sed 7.4%; the seb and sec genes have not been identified in the bacteria. For the hemolytic toxins, 51.9% of isolates harbored both genes (hla and hlb), the frequency of hla gene was 81.5% and 51.9% for the hlb gene. The evaluated toxin-encoding gene frequency is high and constitutes a potential risk for public health, especially staphylococcal enterotoxin genes; because they are heat-stable enterotoxins and have been associated with food poisoning.(AU)