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.
Acute bacterial sinusitis in adults most often manifests with more than 7 days of nasal congestion, purulent rhinorrhea, postnasal drip, and facial pain and pressure, alone or with associated referred pain to the ears and teeth. There may be a cough, often worsening at night. Children with acute sinusitis might not be able to relay a history of postnasal drainage or headaches, so cough and rhinorrhea are the most commonly reported symptoms. Other symptoms can include fever, nausea, fatigue, impairments of smell and taste, and halitosis.