“…2,3 When an infectious agent is isolated, the most commonly described pathogen is Streptococcus pneumoniae, 3 although other bacteria including Staphylococcus aureus 4 and Neisseria meningitides 5 have been implicated. Less commonly seen are non-bacterial causes, which include viruses, trauma, thermal injury, irritant chemicals, recreational drugs, chemotherapy, and radiotherapy.…”