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Table 2 Differences between primary and re-emerged clusters of STM

From: Improving resolution of public health surveillance for human Salmonella entericaserovar Typhimurium infection: 3 years of prospective multiple-locus variable-number tandem-repeat analysis (MLVA)

  Primary1 clusters (n = 15) Re-occurred2 clusters (n = 24) Statistical significance
  Mean CI (95%) Mean CI (95%)  
Cluster size (number of cases) 22.66 12.78 66.46 42.18 P = 0.005
Duration (weeks) 7.21 3.98 12.04 0.27 P = 0.07
Temporal density 1.4 3.95 1.47 0.27 NS
Spatial density 1.95 0.49 2.75 0.18 P < 0.001
  1. Notes: 1 A primary cluster is the first due to a new MLVA type
  2. 2 A re-occurred cluster is a second or subsequent cluster due to the same MLVA type as the corresponding primary cluster