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Table 4 Probability that viruses in clusters of outbreaks differ from the population of circulating viruses (genogroup II4)

From: Linking healthcare associated norovirus outbreaks: a molecular epidemiologic method for investigating transmission

Clustera Common Sequence Common sequence in cluster/total sequenced specimens in cluster Common sequence in rest of population/total sequenced specimens in rest of population Fisher's exact test (P-value)
1 1A 60% (3/5) 38% (20/55) 0.36
2 1A 67% (2/3) 38% (21/55) 0.33
3 2A 88% (7/8) 12% (6/52) 0.004
4 1A 100% (4/4) 34% (19/56) 0.018
  1. aSee Figure