The following are the most important diseases or complications that may be co-morbid with Q fever:
Respiratory system (J00-J99)
- Pneumonia (pneumonia)
Cardiovascular system (I00-I99)
- Endocarditis (meningitis) – occurs in chronic Q fever (most common and dangerous late complication).
- Myocarditis (inflammation of the heart muscle).
- Pericarditis (inflammation of the pericardium)
Infectious and parasitic diseases (A00-B99).
- Chronic Q fever – in circa one percent of cases.
Liver, gallbladder, and bile ducts-pancreas (pancreas) (K70-K77; K80-K87).
- Hepatitis (inflammation of the liver)
Psyche – nervous system (F00-F99; G00-G99)
- Meningoencephalitis (combined inflammation of the brain (encephalitis) and meninges (meningitis)) – possibly with retrobulbar headache (intensification with increase in intracranial pressure and eye movements), aphasia (speech disorders), hemiparesis (hemiplegia), confusion, and visual disturbances.
Pregnancy, childbirth, and puerperium (O00-O99).
- Abortion (miscarriage)
- Premature birth
- Decreased birth weight
