Influenza (Flu)
What Is It?
Highly contagious viral respiratory illness. Causes sudden fever, chills, myalgia, headache, cough, and fatigue. Can lead to pneumonia and hospitalization in high-risk patients.
How Is It Diagnosed?
Rapid influenza diagnostic test (RIDT) or molecular assay (PCR) from nasopharyngeal swab. Clinical diagnosis acceptable in high-prevalence season.
How Is It Treated?
Oseltamivir (Tamiflu) within 48 hours of symptom onset for high-risk patients. Supportive care: rest, fluids, analgesics. Annual vaccination strongly recommended.
Tests and Imaging Typically Needed
Rapid flu test or PCR, COVID-19 test, chest X-ray if pneumonia suspected, CBC if severe.
Approximate Self-Pay Costs
Office visit: $95-$150. Rapid flu test: $20-$40. Oseltamivir: $30-$80. Annual flu vaccine: $20-$40.