There are various different ways that pathogenic bacteria can damage and kill human cells, but one of the most common is by the production of toxic molecules. These small molecules are made inside the bacterial cell, the protein chain built using the DNA template and then often modified within the cell before being secreted directly into, or in the general direction of, human cells. A recent paper in PLoS Pathogens took a look at some of these toxic molecules produced by C. difficile, a human pathogen that infects the human colon and is showing worrying levels of antibiotic resistance.
"Anything is possible. You can be told that you have a 90-percent chance or a 50-percent chance or a 1-percent chance, but you have to believe, and you have to fight." -- Lance Armstrong, 21st century cyclist and 6 time Tour de France winner