However, the level of NF-κB activity In HeLa cells infected with the ΔgogAΔgtgAΔpipAΔsseK1ΔsseK2ΔsseK3ΔsteE strain after 20 hrs of infection was similar to that in the HeLa cells infected with the wild-type. Here, NFKB1 is linked to infection.