A scientist might work in a laboratory, out in nature, at a special office, as a professor, as a writer or journalist, and more! To answer puzzling questions, scientists might do everything from performing tests and collecting surveys to brainstorming and daydreaming! Scientists use all kinds of different tools for their jobs: Computers, telescopes, microscopes, rulers, thermometers, barometers, scales, beakers and test tubes, and much more!
The bacteria that causes the bubonic plague is called Yersinia pestis. This bacteria also causes the other two forms of plague: septicemic plague and pneumonic plague (see Types of Plague).
There are 3 varieties of plague: bubonic, pneumonic and septicaemic. There are 3 varieties of plague: bubonic, pneumonic and septicaemic. In general it is benign, but occasionally, for reasons the epidemiologists still do not understand, the bacilli multiply in a flea's stomach until they cause a blockage.