Significance of dormant forms of Helicobacter pylori in ulcerogenesis

Figure 1 Morphology of Helicobacter pylori. S-shaped H. pylori with five to seven sheathed polar flagella. Field emission SEM, bar = 0.5 μm. (Field emission SEMs courtesy of L. Thompson and negative stains courtesy of S. Danon, School of Microbiology and Immunology, University of New South Wales). From: Helicobacter pylori: Physiology and Genetics. Mobley HLT, Mendz GL, Hazell SL, editors. Washington (DC): ASM Press; 2001. Chapter 6, Morphology and Ultrastructure[54].

Figure 2 Microscopic images of coccoid forms of Helicobacter pylori after 6-d exposure to antibiotics. From: Faghri et al[65].

Figure 3 Microscopic images of morphological forms of Helicobacter pylori after exposure to antibiotics: S-shaped, U-shaped, C-shaped and coccoid-shaped. From: Faghri et al[65].

Figure 4 Electronograms of coccoid forms of Helicobacter pylori. A: Initial ingrowth in the periplasmic space resulting in the formation of U-shaped cells; B: Conversion to the coccoid form. Ultrathin section, bar = 0.5 μm. From: Helicobacter pylori: Physiology and Genetics. Mobley HLT, Mendz GL, Hazell SL, editors. Washington (DC): ASM Press; 2001. Chapter 6, Morphology and Ultrastructure[54].

Figure 5 Major physiological states and forms of Helicobacter pylori[101]. H. pylori: Helicobacter pylori.