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Study of the acute pulmonary toxicity/pathogenicity in rats treated with Metarrhizium anisopliae

机译:厌氧假单胞菌治疗大鼠的急性肺毒性/致病性研究

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Metarhizium anisopliae, a fungus belonging to the family Moniliaceae, is a microbial pesticide effectively used to control coleopterans of the families Elateridae and Curculionidae. The acute pulmonary toxicity/pathogenicity of the product Metarhizium PM (M. anisopliae) was evaluated in rats. The animals were anesthetized and intratracheally inoculated with 108 conidia per animal of the viable and inactivated microorganism and compared with the control groups (vehicles and untreated animals). Clinical observations and evaluation of food and water intake were carried out daily. The microbiological analysis of organs and the macro and histopathological studies were carried out at days 3, 7 14 and 21. At the end of the study, the groups did not differ in their weights at each sacrifice time; no animal died during the test or showed evident disease clinical symptoms. The histopathological examination showed an acute inflammatory response of the lung in the three groups where the intratracheal application was carried out, which was more severe in the group with the viable microorganism and decreased in severity in the control group The severe lesions decreased during the test and, at day 21, the tissue recovery, with only focal accumulations of lymphocytes, was observed. No fungal germination was found on any of the organs examined at the end of the experiment. The results showed no pathogenicity or severe toxicity of the Metarhizium-based product when administered in a single dose to rats intratracheally.
机译:拟南芥属的一种,属于Moniliaceae科的一种真菌,是一种微生物农药,可有效地控制Elateridae和Curculionidae科的鞘翅目。在大鼠中评估了Metarhizium PM(anisopliae)产品的急性肺毒性/致病性。麻醉动物,并向每只动物的活和灭活的微生物气管内接种108个分生孢子,并与对照组(车辆和未治疗的动物)进行比较。每天进行临床观察并评估食物和水的摄入量。在第3、7、14和21天对器官进行微生物学分析,并进行宏观和组织病理学研究。研究结束时,各组在每次处死时的体重没有差异。试验期间没有动物死亡或没有明显的疾病临床症状。组织病理学检查显示,在气管内应用的三组中,肺有急性炎症反应,在有活微生物的组中更为严重,而在对照组中则降低了严重程度。在第21天,观察到组织恢复,仅局部聚集了淋巴细胞。实验结束时,在检查的任何器官上均未发现真菌发芽。结果显示,气管内单次给大鼠施用基于金属的产品没有致病性或严重的毒性。

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