You Report To Fran

utside you hear the putt-putt-putt of a motor scooter approaching. Then Fran barrels through the door, pulling a helmet off her head. "Time's up," she announces. "We need your conclusion. What's the pathogen in the milk?"

What do you tell Fran?

CHOOSE ONE:

"It's a bacterium"
"It's a fungus"
"It's definitely a virus"
"It's a chemical"
"It's none of the above"

An Access Excellence Science Mystery sponsored by Genentech, Inc.