Adjunctive effect of ascorbic acid on tetracycline treatment inbroiler chickens challenged with tetracycline-resistant Escherichia coli
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Keywords:
Ascorbic acid pretreatment, Broiler chicken, Tetracycline Resistance, tet A gene, tet B geneAbstract
The emergence of multidrug-resistant organisms due to the indiscriminate use of antibacterials has become a critical health concern for humans and animals. This study aimed to explore the potential of ascorbic acid to enhance the in vitro and in vivo effectiveness of tetracycline against Avian Pathogenic Escherichia coli (APEC) infections resistant to tetracycline. Isolates of E. coli from broiler chickens affected by colibacillosis were screened for the presence of tetracycline-resistant genes. The in vitro antibacterial properties of ascorbic acid were evaluated. In the in vivo experiment, the birds were pre-treated with ascorbic acid beginning on day three, and on day seventeen of trial, they were challenged with tetracycline-resistant APEC. Clinical symptoms of infection were observed two days
post-challenge and then treated with tetracycline for 5 days continuously. After five days of tetracycline treatment, blood samples and organ tissues were collected for haematological, biochemical and histopathological analyses. The study revealed that 60% of prevalence rate for APEC isolates showing the highest resistance with tetracycline. The combination of ascorbic acid did not markedly enhance the antibacterial efficacy of tetracycline in vitro, its administration in vivo has notably diminished disease severity. Although no marked in vitro synergistic effect was observed, ascorbic acid supplementation was associated with reduced disease severity in vivo, suggesting a potential supportive role during antibacterial therapy that warrants further investigation.
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