The lung abscess in children can be caused by all except –
Lung abscess in children 

Lung abscess is most likely to occur in -

i)  Immunocompromized patients
ii) Those with recurrent aspiration
iii) Malnutrition 
iv) Blunt chest trauma
v) Complication of pneumonia

Organisms commonly causing lung abscess are -
Staph. aureus  
H.influenzae 
S. pneumoniae  
Pseudomonas
E.coli 
Klebsiella                   
Others are → Nocardia, Legionella, Fungi (candida and aspergillus)
Pneumococcus
E. Histolytica
Staphylococcus
Klebsiella