RESUMO Objetivando avaliar o efeito da suplementação com megadoses de vitamina C na dieta de alevinos de Tilápia do Nilo ( Oreochromis niloticus), frente à infecção experimental por Edwardsiella tarda, foram realizados dois experimentos. Cada experimento foi composto por quatro grupos distintos: aqueles pertencentes aos grupos 1 e 4 receberam apenas ração comercial apresentando cerca de 300 mg de vitamina C por quilo de ração, enquanto os animais pertencentes aos grupos 2 e 3 receberam a mesma ração suplementada com 1.500 mg e 3.000 mg, respectivamente, de vitamina C (Lutavit® C Monophosphate – BASF) por quilo de ração. No primeiro experimento os animais receberam a dieta durante 14 dias consecutivos, sendo desafiados no 15º dia, enquanto no segundo experimento os animais só foram desafiados pela suspensão bacteriana após um intervalo de mais 14 dias findo o mesmo período de suplementação com vitamina C. Os resultados mostraram que, embora não haja diferença significativa (p > 0,05) com relação às concentrações de vitamina C, o intervalo entre o final do período de suplementação com megadoses de vitamina C na ração (Nutripeixe AL55 – PURINA) e a exposição à suspensão bacteriana apresentou diferença significativa (p < 0,05) sobre a infecção experimental com E. tarda em alevinos de Tilápia do Nilo (O. niloticus).
OBJECTIVES:1. Investigate the prevalence of Streptococcus salivarius in the oral commensal flora of patients that were divided in two groups: with and without history of recurrent tonsillitis. 2. Compare the prevalence of Streptococcus salivarius in these two grou METHODS: Twenty-five patients of both sexes were enrolled in this study, with ages between 2 and 10 years. The patients were divided into 2 groups: children with recurrent tonsillites (Group I) and without recurrent tonsillar infections (Group II). The criteria of recurrent tonsillitis was defined by the current guideline in Brazil. We collected oral swabs in patients of both groups that were later submitted to culture and identification of S. salivarius. The results had statistical analysis. RESULTS: In Group I, with 15 patients, S. salivarius were identified in 0% of cases and non salivarius stains in 100% of the patients. In Group II, with 10 patients, we identified S. salivarius in 62,5% of the cases and non salivarius stains 37,5% of the patients. CONCLUSIONS: Children with recurrent tonsillitis present with minor settling of S. salivarius in the oropharynx compared with children without recurrent tonsillar infections. These data suggest a protective role for S. salivarius against pathogenic bacteria of the oropharynx.
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