Streptococcus agalactiae infection kills red tilapia with chronic Francisella noatunensis infection more rapidly than the fish without the infection

Fish & Shellfish Immunology
Wanna SirimanapongBoonsirm Withyachumnarnkul

Abstract

In this study we examined the effect that a Francisella noatunensis (Fno) infection had on hybrid red tilapia (Oreochromis niloticus × Oreochromis mossambicus) subsquently infected with Streptococcus agalactiae. A variety of hemato-immunological parameters (haematocrit, total red blood cell count, mean corpuscular volume, total white blood and differential cell counts, total plasma protein, plasma lysozyme and plasma peroxidase activities, and respiratory burst and phagocytic activities of head-kidney macrophages) were measured in hybrid red tilapia that had been previously exposed to an Fno outbreak in a tilapia grow-out farm. The head-kidneys of these apparently healthy survivors, when checked by PCR were found to be Fno-positive with hemato-immunological parameters that were similar to fish without an a priori infection. The only exception was the percentage lymphocyte count in the peripheral blood, which was slightly, but significantly, lower in the Fno-infected fish, compared to those without the infection. When experimentally infected with S. agalactiae, the Fno-infected fish died more rapidly and at a significantly higher rate than fish without the infection. During the challenge, the hemato-immunological parameters of b...Continue Reading

Citations

Sep 26, 2020·Journal of Fish Diseases·Iyapa PalangRapeepun Vanichviriyakit
Apr 22, 2020·Journal of Fish Diseases·Hany M R Abdel-LatifMansour El-Matbouli
Dec 17, 2021·Diseases of Aquatic Organisms·Thangaraj Raja SwaminathanKuldeep Kumar Lal

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