<prompt> a 2 year old child is brought to th er with ho fever and vomiting.oe hehas neck rigidity .the csf repo shows 2000ml protien 100mgdl the gram stain shows the presence of gram negtive bacilli the culture shows growth of bacteria only on choclate agar and not on blood agar the causative agent is :neisseria mengitidisheamophilus influenzaebordotella peusisstreptococcus pyogens  <response>: Haemophilus Influenzae Mode of Transmission: Droplet infection and discharge from the upper respiratory tract during the infectious period. Incubation Period Unknown, probably sho, 2-4 days. Infectious Period - As long as the organism is present, even in the absence of nasal discharge. - Noninfectious within 24 to 48 hours after the sta of effective Haemophilus influenza type b Medical Management Hospitalization required Treatment with an effective 3rd generation cephalosporin, or chloramphenicol plus ampicillin Ampicillin-resistant strains now common throughout the United States ref : ananthanaryana 9th ed 