Influenza B Symptoms 2025. Sudden onset of fever or chills Get nhs advice on influenza (flu), including symptoms, how to treat it at home and when to seek medical advice.
Antigenic typing of circulating influenza strains to date by esr’s who national influenza centre show a good match with the 2025 seasonal influenza vaccine. Both influenza a and influenza b are highly contagious, and their symptoms are similar: