Fig. 3. (A) Accumulated mortalities of Nile tilapia kept at different wat
temperatures. (B) Numbers of viable GBS in brain tissue of infected tilap
(* and ~) Indicate significant difference from the control (P < 0.05).
Fig. 1. Pathogenicity of GBS growing at different temperatures. (A)
Growth at 28, 32, 35 and 37 8C. Arrow indicates early-log phase of
bacteria. (B) Hemolytic activity of GBS, expressed as the amount of
hemoglobin released from RBC. In the positive control, RBCs were
completely lysed with 1% SDS. (C) Relative percent survival of GBS after
incubation with Nile tilapia whole blood for 1 h. (*) Indicates significant
difference from the 28 8C value, P < 0.05.
Fig. 2. Expression of putative virulence genes of S. agalactiae in response to an increase of temperature. The expression values of log- and stationary-phase of
streptococcus growing at 35 8C were calculated in relation with the bacteria growing at 28 8C by DDCt method. Asterisk indicates significant difference
(P < 0.05) between stationary- and log-phase.