Pneumatocele is caused by –
Pneumatoceles

These are multiple thin walled air containing cysts.
Staphylococcus aureus is the most common organism causing pneumatoceles and pneumatoceles are considered pathognomonic of staphylococcal pneumonia.
E.coli and klebsiella pneumonia may have pneumatoceles. __ O.P. Ghai 6th /e 350
Staphylococcus
Streptococcus
Streptococcus pneumoniae
P. carnii