date:May 16, 2012
itiative questionnaire, while lengthy, was instrumental in last year's Listeria investigation.
FDOSS, which has been around since 1973, allows CDC to compare outbreak data over time. Mahon says the four systems together allow CDC to make some conclusions.
For example, during the 1990s, all efforts against Listeria brought the total incidence of infection down, from about 8 cases per million to about 2. It's remained at about that level since.
However, Mahon says the incidence of Listeri