M. bovis clusters Dating estimates (years before present) Approximate year
MRCA of cluster 1 10 – 26 1992 – 2008
MRCA of cluster 2 18 – 39 1979 – 2000
MRCA of cluster 3 15 – 40 1978 – 2003
MRCA of clusters 1 and 2 23 – 47 1971 – 1995
MRCA of clusters 1, 2 and 3 50 – 103 1915 – 1968
MRCA of TB013S13L (cluster 4) 25 – 77 1993 – 1941
MRCA of M. bovis from llamas 10 – 21 1997 – 2008