Fig. 4From: Global status of tetracycline resistance among clinical isolates of Vibrio cholerae: a systematic review and meta-analysisFunnel plots of the meta-analysis for resistance rate of V. cholerae serogroups O1 and Non-O1, non-O139 to tetracycline (a, b) and doxycycline (c, d), respectively. (In case of serogroup O139, the number of included studies was fewer than three and insufficient for application of funnel plot)Back to article page