by Elio — We needn't be re­minded that path­o­genic mi­cro­bi­ol­ogy is a branch of mi­cro­bial ecol­ogy but a nice ex­am­ple helps makes the point. The story is about a nasty dis­ease, pseudomem­bra­nous col­i­tis, which af­fects mainly im­muno-com­pro­mised peo­ple who have been on an­tibi­otics and are ly­ing in a hos­pi­tal bed. The dis­ease, as the name sug­gests, is an...