A rather rare finding in pulmonary imaging, the cavity formation may result from bacterial infections such as microaerophilic streptococci, viridans streptococci
, Klebsiella pneumoniae, Staphylococcus aureus, Pseudomonas aeruginosa, Haemophilus influenzae, Acinetobacter species, Escherichia coli, Legionella species, Fusobacterium necrophorum, Nocardia asteroides, mycobacteria such as Mycobacterium tuberculosis, nontuberculous mycobacteria and Mycobacterium avium complex, fungi such as Cryptococcus neoformans, Coccidioides, Aspergillus and mucormycosis, parasites such as Paragonimus westermani and Echinococcus genus, and viral infections such as papilloma virus [1,2].
Empyema thoracis and lung abscess caused by viridans streptococci
. Am J Respir Crit Care Med 1997;156(5):1508-14.
Classification and identification of the viridans streptococci
isolated by culture from blood of cancer patients: clinical and microbiologic analysis of 50 cases.
Other commonly reported organisms include Streptococcus pneumoniae, Haemophilus influenzae, viridans streptococci
, and anaerobic bacteria [2, 3].
Common organisms include Viridans streptococci
, Staphylococcus aureus, and other staph species.
Selkar, "Rare and unusual isolates of viridans streptococci
from the human oral cavity," Indian Journal of Pathology and Microbiology, vol.
Results: The organisms detected in the participants were coagulase negative Staphylococcus and Staphylococcus aureus, Viridans streptococci
, diphtheroids, micrococci, bacteroides, and Klebsiella by culture.
and Groups C and G Streptococci.
The early oral microbiota occurring within several hours following delivery is composed of viridans streptococci
and Streptococcus salivarius (S.
suis are not defined in the 2015 Clinical and Laboratory Standards Institute guidelines, breakpoints for viridans streptococci
were used instead (4).
cause most cases, although Staphylococcus aureus is also an important cause that often requires early surgery for successful eradication.