The FDA said so far, they "don't have anything that indicates this is linked to Enfamil." However, the agency is testing samples from the open packet of formula fed to the infant, an unopened packet of the formula and the water used to mix the formula. They expect results by the middle of next week.
Avery is the second infant to develop a Cronobacter sakazakii-related infection in a Missouri hospital in the past month, the department said on its web site. The second infant recovered.
A spokesman for Mead Johnson Nutrition, the manufacturer of Enfamil formulas, said on Thursday that the company routinely tests its formula for Cronobacter.
"The batch of our product used by the child's family tested negative for Cronobacter when it was produced and packaged, and that has been reconfirmed from our batch records following this news," he said.
Cronobacter sakazakii, once known as Enterobacter sakazakii, is a bacteria found in powdered infant formula as well as in plant material and the environment, according to CDC.
In addition to meningitis and bloodstream infections, Cronobacter sakazakii can cause necrotizing enterocolitis, a condition in which the intestinal lining dies off.
Symptoms of necrotizing enterocolitis include bloody stool, diarrhea, vomiting, lethargy and intoleratnce to feeding.
Symptoms of meningitis in infants include high fever, neck and body stiffness, constant crying and seizures.
Additional reporting by ABC News' Brian Hartman and Josh Cohan. Associated Press reports contributed to this report.