Medical Definition of puerperal fever
: an abnormal condition that results from infection (as by streptococci) of the placental site following delivery or abortion and is characterized in mild form by fever of not over 100.4°F (38.0°C) but may progress to a localized endometritis or spread through the uterine wall and develop into peritonitis or pass into the bloodstream and produce sepsis—called also childbed fever, puerperal sepsis
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