What result from Griffiths experiment suggested that the cause of pneumonia wasnt a chemical poison?

In his experiment, Frederick Griffith combined heat-killed bacteria with live, non-virulent bacteria. When the mixture was injected into mice, the mice became ill and died. Griffith concluded that a "transforming principle" from the heat-killed bacteria had transferred genetic material to the live bacteria. This "transforming principle" was later identified as DNA, and it is the evidence suggesting that the cause of pneumonia wasn't a chemical poison, but rather a genetic transfer from one bacteria to another.