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1 However, taking vitamin C before the onset of cold symptoms may shorten the duration of symptoms. 2  Vitamin C may provide benefit for people at high risk of colds due to frequent exposure â for example, children who attend group child care during the winter.
1. Fever. The initial sign that you have the flu, and not just a routine cold, will be a high fever that soars between 102- and 106-degrees Fahrenheit (or 38-degrees Celsius). Typically, childrenâs fevers will be higher than adult fevers and can last 3 to 4 days before breaking.