Anticoccidial efficacy of naringenin and a grapefruit peel extract in growing lambs naturally-infected with Eimeria spp.

The current study aimed to determine the anti-Eimeria efficacy of an extract of grapefruit peels (GF) and commercial naringenin (NAR) in naturally-infected lambs, as well as the influence of these flavonoids on the oxidative status during ovine coccidiosis. Pharmacokinetic profiles were also determined. Extracts were administered per os to Eimeria naturally infected growing lambs during 90 consecutive days. The commercial anticoccidial drug toltrazuril (TTZ) was included in this trial as a standard. Twenty-four lambs were divided into four groups: NAR, lambs given a daily dose of 5mg of a commercial naringenin extract of 98% higher purity per kg body weight; GF, lambs that recived a daily dose of 5mg of ethanolic extract of grapefruit peels per kg body weight; TTZ, lambs treated with 20mg of toltrazuril/kg body weight on days 0 and 15 of the experiment; and CTRL, untreated lambs that received daily dose of 30ml of water. Daily doses of GF and NAR were dissolved in 30ml of water and orally given to animals; whereas toltrazuril was administered as a single dose of an undiluted suspension to lambs of the TTZ group. The CTRL group received 30ml of water; as well as the TTZ group for the period after the single dose administration. Fecal and serum samples were collected from all lambs. Anticoccidial efficacy was estimated by coprological techniques. Generation of nitric oxide levels and the antioxidant capacity of the experimental compounds were determined by the Griess and ABTS assays, respectively. The pharmacokinetic parameters of NAR and the GF extract were obtained. On day 30 post-ingestion, anticoccidial efficacy was 91.76% (NAR) and 89.65% (GF); whereas 99.63% of efficacy was achieved with TTZ 15days after treatment. NAR, GF and TTZ significantly reduced oxidative stress in infected animals. The mean daily weight gain for each group was 122g (NAR), 122g (GF), 143g (TTZ) and 98g (CTRL). Following the oral administration of NAR and GF, values in plasma approached maximum concentrations within 2.1 to 2.5h. In conclusion, the administration of NAR and the GF extract reduced Eimeria oocyst output, oxidative stress and promoted higher mean daily weight gains in infected lambs.

Sulfasalazine reduces the number of flares of acute anterior uveitis over a one-year period.

OBJECTIVE: To evaluate the efficacy of sulfasalazine (SSZ) in the prevention of recurrent flares of acute anterior uveitis (AAU). METHODS: We included patients seen from June 1997 to October 2000 in this prospective, open, longitudinal study who fulfilled the following inclusion criteria: either (1) > or = 3 flares of AAU in the previous year or (2) > or = 2 recurrences of uveitis within 3 months before starting the trial. We excluded uveitis of infectious or malignant origin or patients with contraindications to the drug. The response criteria were defined as absence of symptoms and the presence of a normal ophthalmologic examination. The major outcome was the number of flares of uveitis over a one-year period compared in the same group of patients with the flares along the previous year without SSZ. RESULTS: Three hundred ninety-four patients with uveitis were evaluated during the period of the study and 10 patients fulfilled the inclusion criteria. The mean number of flares in the pre-SSZ year was 3.4 (SD 0.5), which was significantly reduced to 0.9 (SD 1.1) in the year of treatment (p = 0.007). CONCLUSION: SSZ treatment seems to reduce the number of flares over a one year period in patients with recurrent AAU.