NFKB1 and infection: S. aureus infected flies and treated with linezolid had better survival and lower bacterial burden 24 h after infection in comparison with the non-treated group. Nevertheless, in comparison with non-infected flies (sham) the geotaxis of the infected and treated ones were significantly lower only in the first 48 h. In addition, flies surviving sepsis showed persistent NF-kB activation and AMP expression, suggesting an effect on their significantly shorter lifespan in comparison with sham.