Eh, my mother has always spoken of stomach bugs and she's always known they weren't caused by insects. Her father was a botanist and her mother a geologist, so

Eh, my mother has always spoken of stomach bugs and she's always known they weren't caused by insects. Her father was a botanist and her mother a geologist, so she grew up in closed proximity to people who spent a lot of time talking about the natural science. Likewise she knows that insect bugs aren't "true bugs" and that jellyfish and starfish are not jelly, fish, or stars.