The concentrations of Campylobacter on the chilled meat were noticeably
higher than on the frozen meat for both Danish produced and
imported meat. No seasonality was observed for concentrations in
the four different quarters (P>0.05). For the semi-quantitative data,
log-normal distributions were fitted using MLE to the extent possible.
The available data did not converge for all quarters; hindering calculation
of risk estimates for the implicated product/year combination.
From the MLE an estimated prevalence, mean concentration and
standard deviation of concentrations were obtained. Fig. 2 illustrates
the fluctuation of mean Campylobacter concentration including the
standard deviation of concentrations (σ). These estimates were used
as input data in the risk assessment model.