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Originally Posted by A Salt Weapon

Spoiler!

one of my coworkers made an interesting point I never picked up on.
The fungus started at a bread/wheat plant. Joe passed on pancakes, biscuits, and cake on that morning. The neighbor grandma was eating biscuits and got the fungus. During the leaving scene the grandma was having biscuits out in her mouth.

Spoiler!

also when Sarah is at the neighbors house the lady asks her if she wants to make cookies(with raw flour of course), to which Sarah declines after learning they are raisin cookies and not chocolate chip. Sarah is never seen coming in contact with the cookies, she is only shown putting a Tupperware container of them in her backpack that was presumably prepared by the neighbor