TABLE 1.

Methods of internalization used in this study

Method of internalizationGrowth phase of SalmonellaCell typeEfficiency of internalizationaReference
SPI1-mediated invasionLate logPhagocytic or nonphagocytic (HeLa or RAW 264.7)+++25
Phagocytosis of opsonized bacteriaStationaryPhagocytic (RAW 264.7)++2,5
Phagocytosis of nonopsonized bacteriaStationaryPhagocytic (RAW 264.7)+2,10
  • a +, low; ++, intermediate; +++, high.