A fever is when a persons body temperature is higher than normal. Usually, insect bites of mosquitoes and honey bees is not a cause for concern but the individuals who have an allergy towards insect bites may develop fever. Insect bites usually cause a low-grade fever in adults and children, which is sometimes accompanied by a localized rash and nauseating feeling. Medical author melissa conrad stoppler, md medical editor william c. , md, facp, facr usually when a person develops a fever, he or she has pain, or cough, or other symptoms that explain why the fever is occurring. But occasionally people develop fevers without an apparent reason. When fevers persist, doctors refer to such a fever as fever of unknown origin. A 44-year-old female asked what would cause a higher billyruben level and a lower white blood cell count in an adult? Symptoms are nausea, vomiting, low grade fever. When the body temperature is above 99 degrees f, but below 103 degrees f, it is considered as low-grade fever in adults. The probable causes of low-grade fever are many, of which some include allergies, bacterial infection, viral disease, fungal infection, and medicine side effects. With roughly 1 billion cases occurring annually, the common cold proves a leading cause of fatigue and low-grade fever among americans. Fever accompanies a cold more commonly in young children than in adults. Other classic symptoms include sneezing, throat scratchiness and a runny nose, which typically resolve in approximately 7 to 10 days.