Please help me identify this story. I think it is a short story, not a novel but I could be wrong.
A scientist works on genetically engineering super intelligent cells. He has some successes. I don't recall the details but his research comes under scrutiny and the funding agency decides to end the experiment and destroy the test cells.
The scientist decides to save his intelligent cells by ingesting them.
The protagonist first comes down with a terrible illness. From here on out, the writing is in the style of someone in and out of lucidity. Essentially the cells are battling the scientist's immune system. Eventually the intelligent cells win and begin re-engineering the human body for their needs.
Using the human body as a reservoir of resources, they expand, change the human body into more of an amoeba structure and eventually invade the city water supply through the protagonists kitchen sink.
At one point one of his colleagues checks on the scientist and the intelligent amoebas capture him/her (I think it's a her). The implication is that the cells will eventually destroy the entire human race this way.