The coccoid forms ofHelicobacter pylori. Criteria for their viability

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Abstract
Summary: The fact thatHelicobacter pylorican revert to a coccoid form has stimulated speculation about its role in transmission and as a possible cause of reinfection in duodenal ulcer disease. Bismuth subcitrate (32 μg/ml), bismuth subsalicylate (64 μg/ml), amoxicillin (0·05 μg/ml) and erythromycin (4 μg/ml) inhibited the growth ofH. pyloriand stimulated the formation the formation of basically respiring but non-culturable coccoid structures. The presence of polyphosphates as energy and phosphorus source permits a certain level of endogenous metabolism to preserve RNA and DNA, as well as structural components like cell wall, cell membrane and cytoplasma for at least 3 months. However, the applied standard laboratory methods were insufficient for regrowth ofH. pyloriout of the coccoid form.