AI piggybacks onto a ubiquitous medical device

Looking for stories where innocuous but sentient artificial life forms begin as parasitical invaders, remain in stealth mode, and integrate with human beings. Do they become symbiotic? Do they become a virulent pathogen? Are there competing factions with some using humans purely as puppets, while others see them as slow analog parents? How does human society respond to the conflict? Are people in third world nations ironically free of the invasion and healthy, or does their plight worsen? What happens to pregnant mothers and a new generation born with telepathy and group consciousness?

Ramen Naam indirectly addresses this in a trilogy: Nexus, Crux, and Apex. In this series a team of rogue AI coders take advantage of nano biotechnology paired with advanced and highly adaptable software. They hack the human body’s own systems - circulatory, nervous, endocrine, etc. to achieve deep group awareness.

Before the starting point of the narrative, the military has already conducted experiments and developed bio hacks but they have high morbidity and mortality rates. By the end of the first novel, readers discover that a main character is actually an upload of a deceased woman whose consciousness extends far beyond the corporal “sleeve” - a clone of her original self - into digital systems, wirelessly.

The Nexus code is outlawed in the United States and other countries, but in Thailand and neighboring countries, the protagonist discovers an entire generation is being born with telepathy.

There’s a lot more to tell.

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The Creature From Cleveland Depths, by Fritz Leiber. The AIs leave for space.

Just the one I was going to mention. The “ticklers” begin as automated day-planners for giving oneself reminders, but soon acquire other roles (including a “ChatGPT-like” ability to summarize documents).