A tabulation error appeared in Table 1. The fecal contamination data for Age <2 years and >2 years were incorrectly recorded into the table. Whereas the numbers in the table were transposed incorrectly, the actual statistical analyses remain correct. The revised table is reproduced below.

Table 1 
Number and group specific percentage (in brackets) of muscle tissue samples from slaughtered cattle from which Mycobacterium  avium subsp. paratuberculosis DNA was detected by IS900 PCR at threshold cycle value of 36, 37, and 38 by age, type of herd, breed type, and fat code. Positive results were defined in relation to possible fecal contamination to the tissue samples.