Abstract
This study aims to evaluate the histopathological changes and the formation of centers melanomacrophages during chronic inflammatory response of Nile tilapia, Oreochromis niloticus, dexamethasone-treated, vaccinated and challenged with Streptococcus agalactiae. To this end, we used 96 young tilapia, weighing about 150g each, packed in 12 tanks, capacity of 1000 L, supplied with running wa…