What Is Glandular Fever in Children Under 5
Glandular fever, also called infectious mononucleosis, is a viral illness caused by the Epstein-Barr virus. In children under 5, symptoms are often mild or absent, but some develop fever, sore throat, swollen lymph nodes, and fatigue. The virus spreads through saliva, so close contact in daycare or household settings increases exposure risk. The U.S. Centers for Disease Control and Prevention provides background on Epstein-Barr virus transmission and clinical presentation.
Most children under 5 who contract Epstein-Barr virus show few or no clear mononucleosis symptoms, which can make diagnosis harder. When symptoms appear, they may include low-grade fever, mild sore throat, swollen glands in the neck, and temporary tiredness. The illness is usually self-limiting, and severe complications in this age group are rare, though monitoring for breathing difficulty or extreme lethargy is important.
How Doctors Diagnose and Manage Glandular Fever in Young Children
Diagnosis starts with a clinical exam and may include blood tests such as a complete blood count and heterophile antibody test, with results interpreted by a pediatrician. In children under 5, doctors often rely on symptom patterns and exposure history because atypical presentations are common. The American Academy of Pediatrics offers guidance on evaluating febrile illness and sore throat in young children.
Treatment focuses on rest, fluids, and age-appropriate fever reducers such as acetaminophen or ibuprofen, as directed by a healthcare provider. Antibiotics are not effective against the virus and are only used if a secondary bacterial infection is present. Parents should avoid contact sports or rough play if spleen tenderness is suspected, and they should seek urgent care if a child shows persistent high fever, difficulty breathing, or severe abdominal pain.
Prevention, Contagious Period, and When to Contact a Doctor
Prevention centers on hygiene measures such as handwashing, avoiding shared cups or utensils, and limiting close contact with children who have active symptoms. The virus can remain in saliva for weeks after symptoms resolve, so careful hygiene at home and in daycare helps reduce spread. The World Health Organization provides fact sheets on infectious disease prevention and hygiene practices for families.
Parents should contact a pediatrician if a child under 5 has a sore throat lasting more than a few days, unexplained fever, swollen glands, or unusual tiredness. Early evaluation helps rule out other causes such as strep throat or bacterial infection and guides supportive care. Trusted sources such as the Mayo Clinic offer patient-focused information on recognizing symptoms and knowing when to seek medical attention.