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 two different forms of pneumonic pest. The primary pneumonic plague infects people by droplet infection from human being to human being. The secondary pneumonic plague develops out of a bubonic plague. The pathogens enter the lungs via blood vessels and provoke there a septicemic plague.