• For those aged 20 years and over total tests ranged from 3619 in 2007 to 16909 in 2011. The percentage that were by PCR ranged from 3.4% to 41% in 2010, but continued a decrease compared with younger age groups. Tests by serology increased compared with younger age groups with a range of 209 to 6924 while tests by culture were higher than in younger age groups with a peak of 61 in 2006, but decreasing to just 6 in 2012.