So, naturalists observe, a flea

Has smaller fleas that on him prey;

And these have smaller still to bite 'em;

And so proceed ad infinitum

- Jonathan Swift

The problem of increasing bacterial resistance to antibiotics has companies searching for new antibiotics. New Horizons Diagnositics Corp. has come up with an elegant method of treating and preventing bacterial infections using nature's own pest management: bacterial pathogens called bacteriophages that reproduce in and kill bacteria.