Although DMSO- and Mtz-treated non-fluorescent mpeg1/umn- embryos (see materials and methods) showed slightly reduced bacterial load and mortality compared to non-treated infected control embryos (Fig 1E and 1F), Mtz-treated mpeg1/umn+ embryos lived significantly longer after iv injection of B. cenocepacia K56-2, with up to 60% of the embryos still alive at 5 days post infection (Fig 1E). Here, MPEG1 is linked to infection.