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 most noticeable symptom of whooping cough, or pertussis, is a frightening, high-pitched whooping sound as people struggle for breath after uncontrollable and violent coughing fits. Cold-like symptoms, including a mild cough and fever, are usually the first signs of whooping cough. While symptoms of the common cold usually subside after a week or two, whooping cough can cause a series of severe coughing fits that continue for several weeks. These intense coughing fits can cause vomiting and fatigue.