Figure 2

Reproduction ratio for MRSA in pigs related to antimicrobial use, age and infection pressure. Reproduction ratio related to use of tetracyclins and β-lactam antimicrobials (yes, no), age of pigs (pre-weaning, post-weaning) and relative proportion of the infection pressure within the pen compared to the total infection pressure (pIP); based on 513 MRSA cases (C) from 989 susceptibles (S) from 4 herds. Note: lines for antimicrobials; post-weaning pigs and no antimicrobials; pre-weaning pigs are overlapping, thus difficult to distinguish.