09:02 Nov 1, 2011 

oui tout à fait d'accord avec SJLD

07:26 Nov 1, 2011 

...define the baseline patterns and thresholds of reporting for which no action is required. In this case, we expect a baseline level of random noise in news media reports generated by case definitional issues, surveillance bias, and overreporting.

07:02 Nov 1, 2011 

This is not about actual baseline prevalence rates but about all the confusing or conflicting reports in the press due to differences in how cases are defined and surveillance bias.
What you have given is not a complete sentence.

The baseline prevalence of a disease is called the "bruit de fond".