PTGER4 and infection: IL-6 concentrations after CPXV-GER1991-3 or CPXV-FIN2000-MAN exposure were similar to those of uninfected animals (p>0.05) whereas increased levels were seen (p = 0.0179) following CPXV-BR, CPXV-AUS1999-867 or CPXV-GER1980-EP4 infection (Figure 2C).