Characteristics of Escherichia coli Isolated from Bovine Mastitis Exposed to Subminimum Inhibitory Concentrations of Cefalotin or Ceftazidime

Figure 2

Cell morphology of parent Escherichia coli and isolates recovered after induction with antibiotics. Cells were subjected to Gram-staining and examined with an optical microscope (1000×). (a), (d), and (g) were parent strains; (b), (e), and (h) were cefalotin-induced isolates; and (c), (f), and (i) were ceftazidime-induced isolates.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)