Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros, 52171-900 Recife, Pernambuco, Brazil.
J Invertebr Pathol. 2010 Jul;104(3):161-5. doi: 10.1016/j.jip.2010.03.001. Epub 2010 Mar 3.
Infectious myonecrosis (IMN), caused by infectious myonecrosis virus (IMNV), is the disease of greatest impact on shrimp farming in the northeast region of Brazil. The occurrence of IMN remained restricted to northeastern Brazil until 2006, when its presence was also confirmed in Indonesia. To determine the occurrence and evolution of IMN in Litopenaeus vannamei farmed along the coast of the state of Pernambuco, Brazil, histopathological examinations were performed on 60 samples collected from four farms in both predominant seasons in the northeastern region: dry and wet seasons. Samples made up of ten specimens were collected monthly from each pond. Histopathological results were associated to wet-mount exams and rearing performance data. Lesions suggestive of IMN (coagulative necrosis, hemocytic infiltration in the musculature, ectopic spheroids in the lymphoid organ) were identified in all the farms, with a higher occurrence during the dry season. Longer rearing periods and higher stocking densities were the variables with the most significant influence (p<0.05) in the occurrence of IMN.
传染性肌肉坏死症（IMN）由传染性肌肉坏死病毒（IMNV）引起，是对巴西东北部虾养殖业影响最大的疾病。直到 2006 年，IMN 的发生仍然局限于巴西东北部，当时也在印度尼西亚确认了它的存在。为了确定巴西伯南布哥州沿海养殖的凡纳滨对虾（Litopenaeus vannamei）中传染性肌肉坏死症的发生和演变，对来自四个养殖场的 60 个样本进行了组织病理学检查，这些样本取自巴西东北部的两个主要季节：旱季和雨季。每个池塘每月从十个标本中采集样本。组织病理学结果与湿载检查和养殖性能数据相关联。在所有养殖场都发现了疑似 IMN 的病变（凝固性坏死、肌肉中的血细胞质浸润、淋巴器官中的异位球体），旱季的发生率更高。更长的养殖期和更高的放养密度是影响 IMN 发生的最显著变量（p<0.05）。
