If a person lived several years without any noticeable signs of viral infection and then one day suddenly fell ill, which of the
following provides the best reason as to why? a.Everything in the person’s internal and external environment remained the same b.The individual was surprised all of a sudden by a group of friends c.Something in the individual’s internal environment changed d.The individual watched a horror film*
Since lice feed on human blood, severe and chronic infestation can lead to blood loss and iron-deficiency anemia. 5 In addition, an allergic reaction to louse feces or bites may trigger a rash in some individuals.
