Why are techniques like IVET and STM continuing to turn up housekeeping genes rather than the ‘‘virulence genes’’ the inventors of these methods envisioned? (If you have a good explanation for this,...

Why are techniques like IVET and STM continuing to turn up housekeeping genes rather than the ‘‘virulence genes’’ the inventors of these methods envisioned? (If you have a good explanation for this, publish it right away. A lot of us are waiting for the answer.)