Transcripts which products are related to amino acid metabolism such as amino acid permease (PADG_07440), O-acetylhomoserine/O-acetylserine sulfhydrylase (PADG_08406) and aromatic-L-amino-acid/L-tryptophan decarboxylase (PADG_00215) were induced in both infection groups, while 4-aminobutyrate aminotransferase/(S)-3-amino-2-methylpropionate transaminase (PADG_02214) was induced only in the 8-weeks infection group. This evidence concerns the gene SLC7A6 and infection.