In particular, MMP13 was overexpressed when compared to IL6 in the following cases: stimulation with IFNγ (approximately 6 times), 10 days after infection with the EIAV Wyoming strain (approximately 4 times), 7 days after infection with the Miami strain (approximately two and a half times), and 7 days after infection with the EIAV Wyoming (approximately one and a half times). This evidence concerns the gene MMP13 and infection.