A quack is defined by Google.com as "a person who dishonestly claims to have special knowledge and skill in some field, typically in medicine." There are other words relating to a quack, such as humbug, charlatan, con artist, and swindler. Overall, anything recommended by a quack will not be useful. In fact, it may be quite dangerous. It may just take your life.
Most of the time, quacks lured in their victims by promising medical miracles. The cures themselves are so dubious that only the desperate would try them. However, the authors of Quackery: A Brief History of the Worst Ways to Cure Everything suggest that quackery is not just about pure deception but, in fact, includes situations when people believe that what they're selling may actually be working. Some examples of common practices include the citizens of the Ottoman Empire eating clay to keep the plague away and the Victorians using mercury steam rooms to cure syphilis.
Author Jennifer Wright studies plagues. Often individuals ask if she studies "modern" plagues, such as using your cell phone too much. But in her new book Get Well Soon: History's Worst Plagues and the Heroes Who Fought Them, she reveals that her interest lies within the history of plagues where you break out in sores and turn feverish. The kind of plagues that kill you.
The main character in Nicola Yoon’s Everything Everything, Madeline, lives in a bubble. Literally. Her house has an airlock and the very rare individuals allowed to enter must go through a decontamination process. Direct contact with anything can be potentially life-threatening, and Madeline has lived this way as long as she can remember. It’s all she knows. She has been comfortable with and understood this life. Until now. Because, when a cute boy named Olly moves in next door, she finds herself wanting more.