The tally of people sickened by the parasite is now 11,458.
A central North Carolina teen is critically ill with a rare amoeba-related brain infection.
The updated vaccines protect against the XFG strain.
"My life was sort of flashing before my eyes a little bit," she said.
The company has shifted to fruit- and vegetable-based dyes as well as colors derived from spices like turmeric and paprika to give its cereals their customary bright colors.