Differential darkfield microscopic examination of subgingival plaque samples from a community, which on clinical evidence had a contained gingivitis (mean probing depth 3.1 mm), revealed 35.7% spirochaetes and 7.4% motile rods. In spite of persistent plaque deposits and a high proportion of spirochaetes, this isolated population in Namaqualand, South Africa, appears to be resistant to periodontitis.
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Africa et al. (1985) studied this question.
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