Some complications associated with specific infections
| Pathogen | Complications |
| S pneumoniae | Septicaemia, pyopneumothorax, pericarditis/endocarditis, meningitis/brain abscess, peritonitis, arthritis, herpes labialis |
| M pneumoniae | Meningoencephalitis, aseptic meningitis, Guillain-Barré syndrome, transverse myelitis, cerebellar ataxia, ascending polyneuropathy, pericarditis, myocarditis, diarrhoea, haemolytic anaemia, skin rashes, polyarthropathy, hepatitis, pancreatitis, splenomegaly, acute glomerulonephritis, haemorrhagic myringitis |
| Legionella spp | Confusion, encephalomyelitis, Guillain-Barré syndrome, cerebellar signs, pericarditis, hyponatraemia, renal failure, rhabdomyolysis and myositis, diarrhoea, polyarthropathyJaundice/abnormal liver function, pancreatitis, thrombocytopenia |
| C burnetii | Optic neuritis, hepatitis, haemolytic anaemia, osteomyelitis, endocarditis with chronic infection |
| S aureus | Pneumatoceles and/or pneumothorax (especially in children), septicaemia, lung abscess, metastatic infection |