They are so small they can only be seen with a microscope. Yeast is a helpful microorganism which makes bread rise. Bacteria is a microorganism which breaks down plants into nutrients ...

They are so small they can only be seen with a microscope. Yeast is a helpful microorganism which makes bread rise. Bacteria is a microorganism which breaks down plants into nutrients ...

This underlines the growing understanding that many so-called 'virulence genes' are probably involved in more general interactions between the microorganism and the host or the environment.