Supplementary Video 2. Multiple bacteria may successfully invade the host cell from a single aggregate Representative confocal microscopy video of 3 biological replicates of HeLa cells infected with Lm-dsRed-PactA-GFP MOI=20 for 2 hours. Video shows an aggregate of 4 bacteria invading a HeLa cell and establishing a successful replicative invasion. Scale bar 10 μm