text: what is the technical/medical name of croup? hint-it is one word that consist of 3 words!  good luck!! croup: laryngotracheobronchitis, viral croup, spasmodic croup, laryngismus stridulus  causes:      * parainfluenza virus type i, which can be recovered in 60% of cases, causes most cases of croup.      * parainfluenza types ii, iii, and iv; influenza a and b; adenovirus; respiratory syncytial virus; herpes simplex virus; measles; rhinovirus; coxsackievirus a and b; echovirus all can cause mild sporadic croup.      * influenza a has been implicated in children with severe respiratory compromise.      * in 1 case, mycoplasma pneumoniae has been recovered.      * bacterial superinfection or bacterial tracheitis is uncommon. staphylococcus aureus (most common), haemophilus influenzae, streptococcus pneumoniae, and moraxella catarrhalis cause bacterial superinfection or bacterial tracheitis. group a streptococcus, viridans streptococci, gram-negative enteric bacteria, and anaerobes also have been implicated. when s aureus invades the trachea, it causes mucosal ulceration and necrosis, and the trachea is covered with a thick purulent exudate. this increases luminal narrowing and exacerbates the respiratory compromise.