Prevalence of class 1 integron in Escherichia coli isolated from animal sources in Iran: a systematic review and meta-analysis

Background Among the genetic elements, integrons may contribute to the widespread incidence and spreading of antibiotic resistance among Escherichia coli isolates. Accordingly, this review aims to investigate the prevalence of class 1 integron in E. coli isolated from animal sources in Iran. Methods This systematic literature search was performed from January 1, 2000 to the end of May 1, 2019. Then, publications that met our inclusion criteria were selected for data extraction and analysis. Also, the quality of included studies was independently assessed by two researchers based on the Joanna Briggs Institute. Meta-analysis was performed by the Comprehensive Meta-Analysis (CMA) software using the random effects model, Cochran's Q, and I-2 tests. Publication bias was estimated by funnel plot and Egger's linear regression test. Results Based on inclusion criteria, five studies were included to meta-analysis. From those studies, the pooled prevalence of integrons was 33% (95% CI, 23.8-43.7%) ranging from 23.8 to 52.4%. There was a significant heterogeneity among the 5 studies (chi(2) = 11.73; p < 0.019; I-2 = 65.91%). Additionally, Begg's and Egger's tests were performed to quantitatively evaluate the publication biases. According to the results of Begg's test (z = 1.22, p = 0.22) and Egger's test (t = 3.03, p = 0.056), a significant publication bias was not observed. Conclusions Our finding revealed the relatively high prevalence of class 1 integrons among E. coli isolates. Moreover, there was a significant heterogeneity among studies and subgroup analysis also showed that there was no difference about prevalence of class 1 integrons among different sample source.