A new employee in the Vital Statistics office wonders how many death certificates the health department usually receives each week. Then, in the following week, the health department receives 61 death certificates. Question: What proportion of other persons with new onset of hepatitis B reported recent exposure to the same dentist, or to any dentist during their likely period of exposure? Hepatitis B has occasionally been transmitted between dentist and patients, particularly before dentists routinely wore gloves. However, he remembers going to the dentist for some bridge work approximately three months earlier. The patient, a 40-year-old man, denies having either of the two common risk factors for the disease: he has never used injection drugs and has been in a monogamous relationship with his wife for twelve years. First, a case of hepatitis B is reported to the health department. Imagine that you work in a county health department and are faced with two challenges. Refer to the book or to the electronic PDF version pdf icon (511 pages) for printable versions of text, figures, and tables. It is not intended to be an online course. This is an online version of a printed textbook.
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