In a detailed study with lettuce and chlorine (200 ppm), it was
observed that cells of E. coli survived to a minor degree in the surface
of the leaves rather than in the inner structures of a vegetable such
as stomata or damage tissue. Cells were able to protect themselves
from the action of chlorine in some areas of difficult access for the
sanitizer; when bacteria penetrated 0e10 mm, the viability was
between 50.8 and 45.6%. Meanwhile when the penetration was
30e40 mm viable cells were 68.3% (