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 disease starts like the common cold, with a runny nose or congestion, sneezing, and sometimes a mild cough or fever. Usually, after a week or two, severe coughing begins. The following are the most common symptoms of whooping cough. However, each person may experience symptoms differently. Infants younger than age 6 months may not have a classic whooping cough, or it may be difficult to hear.