"Overview of CDC efforts to..."
"Introduce a conceptual framework"
"The pathogen - vehicle plane"
"The pathogen - vehicle plane"
"The pathogen - vehicle plane"
"The bounded pathogen - vehicle..."
"The bounded pathogen - vehicle..."
"The food processing continuum"
"How many of the infections..."
"How many of the infections..."
"What was the relative contribution..."
"Considering levels of contamination at..."
"What was the relative contribution..."
"Also have three case-control studies..."
"Attribution using three principle methods"
"Attribution using three principle methods"