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Background:  The protoscoleces of fertile hydatid cysts are considered as major risks in surgery and producing secondary cysts if rupture the cyst during operation and, cause infecting the dogs with adult worm if eaten by this animal. Bacterial infection of the hydatid fluid can lead to sterilization of the cyst.    Objectives:  The aim of this study was to determine the bacterial infection rate of livestock hydatid cysts in Hamedan, Iran, and test the isolated bacteria effects on viable protoscoleces,  in vitro .    Materials and Methods:  A total of 5709 slaughtered livestock were inspected to detect the presence of hydatid cysts. The hydatid fluid of all cysts was cultured separately to isolate and identify the bacteria. The effect of isolated bacteria was tested on viable protoscoleces in culture tubes,  in vitro . The culture tubes were observed and examined under a light microscope every two hours for 24 hours, and then, after 36 and 48 hours.    Results:  Infected cysts were found in 74% of animals in Hamedan (46% were calcified and the bacteria was isolated from 52%) and 62% in Borujerd. The isolated bacteria in the infected cysts were as follows:  Escherichia coli ,  E. blattae ,  Klebsiella pnoumoniae ,  Proteus mirabilis ,  Enterobacter aerogenes , coagulase-positive and coagulase-negative Staphylococci,  Pseudomonas aeruginosa  and  Edwardsiella tarda . The protoscoleces incubated with the isolated bacteria totally degenerated, but 55% of the protoscoleces in the control groups were intact and viable even after one week.    Conclusions:  This study indicated a high percentage of cysts bacterial infections in two provinces of Iran. The common isolated bacteria were  E. coli  and  Klebsiella . The isolated bacteria degenerated the protoscoleces during short-time incubation,  in vitro .

Infected Hydatid Cysts Bacteria in Slaughtered Livestock and Their Effects on Protoscoleces Degeneration