Twenty-four clinically isolated Aeromonas caviae strains were investig
ated for their invasive potential to two human cell lines, HEp-2 and C
aco-2. Most A. caviae strains proved to be non-invasive. However, seve
ral strains exhibited high invasive efficiencies. These were investiga
ted further and intracellular bacteria were visualised by transmission
electron microscopy and fluorescent staining with acridine orange-cry
stal violet.