Each day the humans are confronted with a variety of pathogens. Most of them are fended off by our immune system. 

For a successful infection, bacteria must deliver so-called virulence factors through a transport channel located in the bacterial membrane.  Scientists from the Max Planck Society and the Federal Institute for Materials Research and Testing have shown how in some bacteria this transport channel is formed like a syringe, enabling them to inject virulence factors directly into the host cell - an important starting point for the development of new drugs that might interfere considerably earlier than antibiotics in the course of infection. 

I think that there is an innate (somewhat mindblind) tendency to assume that other people think, feel, react the same way we do. Americans are often egocentric. We think that our way is the best way and assume that everyone wants to be like us. While it can be quite arrogant, when we are at our idealistic best, it is perhaps somewhat a quaint utopian dream.