Figure 2
From: Bovine Spongiform Encephalopathy (BSE) – Infectious, Contagious, Zoonotic or Production Disease?
Proportion of all British (-◆-) and Swiss (-▲-) BSE cases with known birth date (y axis) by birth year (x axis). The immediate drop in cases in the year after the first ban of feeding meat and bone meal to cattle (UK July 1988, CH Dec 1990, as indicated by the arrows) highlight the strong (causal) association between MBM feeding and BSE (data as of August 2001).