PDX1 and infection: P. salmonis seems to be specifically altering some peroxiredoxins as part of its infection strategy, since PDX4 levels were similar in infected and uninfected cells, while PDX6 was upregulated in was upregulated in vacuolization, and TDX, PDX1, and mitochondrial PDX5 were upregulated in the infected SHK-1 cells during the propagation stage (Table 1).