MS-DOS resulted from a request in 1981 by IBM for an operating system to use in its IBM PC range of personal computers. Microsoft quickly bought the rights to 86-DOS from Seattle Computer Products, and began work on modifying it to meet IBM's specification.
Complications from whooping cough can include weight loss, loss of bladder control, fainting, rib fractures from severe coughing, and pneumonia. A small percentage of adolescents and adults with whooping cough need to be hospitalized for their illness. In one study, 61% of adults with whooping cough missed work.
The term whooping cough is based on the characteristic noise made as the person at the end of a coughing attack that sounds like a high-pitched whoop as the person tries to suck in a breath. Symptoms of whooping cough vary. Early in the infection, the symptoms resemble those of a cold; mild fever,