<prompt> What is the most frequent causative agent for acute epiglottitis in children under 5 years of age?Haemophilus influenzae type BInfluenza virus type APara influenza virus type 1Staphylococcus aureus  <response>: a. Haemophilus influenzae type BRef: Nelsons 20e p 2032-2033Etiology of Epiglottitis: H influenzae type B. Pneumococcus, b-hemolytic Streptococcus and Staphylococccus 