2012 Surveillance Slides
Slide 35. Number of County-based Tuberculosis Genotype Clusters by Cluster Size, United States, 2010–2012. This slide shows the number of county-based TB genotype clusters by the size of the clusters; genotype cluster is defined as two or more cases with matching spoligotype and 24-locus MIRU-VNTR (GENType) within a county during the specified three year time period. In the 2010 – 2012 three year time period, there were 996 two-case clusters, 257 three-case clusters, 250 4– 9-case clusters, 30 10 – 19 case clusters, and nine case clusters that were greater or equal to 20 in size.