![]() Persistent fever develops and gradually rises, usually in a stepwise fashion, reaching a peak of 39 or 40 ☌ (103 or 104 ☏) after 7–10 days left untreated, the fever continues with only slight morning remissions for another 10–14 days, sometimes longer. There may be loss of appetite, nosebleeds, cough, and diarrhea or constipation. Course of infectionĪfter an average 10–14-day incubation period, the early symptoms of typhoid appear: headache, malaise, generalized aching, fever, and restlessness that may interfere with sleep. In the early part of the 20th century, prophylactic vaccination using killed typhoid organisms was introduced, mainly in military forces and institutions, and contributed to a lowering of the incidence of the disease. The prevention of typhoid fever depends mainly on proper sewage treatment, filtration and chlorination of water, and exclusion of carriers from employment in food industries and restaurants. How much do you know about human anatomy? How about medical conditions? The brain? You’ll need to know a lot to answer 44 of the hardest questions from Britannica’s most popular quizzes about health and medicine.
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