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Published on: June 23, 2015
Occurrence and pathogenicity of Mycoplasma hominis in the upper urinary tract: a review
Abstract:
In two studies Mycoplasma hominis was isolated from the upper urinary tracts of seven of 80 patients with symptoms of acute pyelonephritis and three of 18 patients with signs of acute exacerbation of chronic pyelonephritis. M. hominis was not recovered from the upper urinary tract of 22 patients with chronic pyelonephritis without acute exacerbation or from 60 patients with noninfectious urinary tract disease. In an additional study, specimens were cultured from patients with antibodies to M. hominis in urine. All of these patients had acute pyelonephritis; M. hominis was isolated from the upper urinary tract of seven patients. Thus, M. hominis was cultured from the upper urinary tract of a total of 17 patients. No other microorganisms were recovered from 12 of these patients. The titer of antibody to M. hominis significantly increased or decreased in the serum of 13 patients, and antibodies were demonstrated in the urine of nine. These results suggest that M. hominis may be a cause of acute pyelonephritis in humans; the organism is estimated to account for approximately 5% of such cases. The clinical signs of infection in the patients studied were subtle, and the symptoms did not involve the lower urinary tract. The diagnosis of acute pyelonephritis due to M. hominis can be established by culture of the organism from the upper urinary tract and its likely if antibodies are present in urine; in contrast, culture of M. hominis from catheter-collected urine or detection of a serum antibody response is not sufficient evidence for this diagnosis.
Insights
Mycoplasma hominis may cause acute pyelonephritis in humans, accounting for about 5% of cases. Diagnosis requires upper urinary tract culture and urine antibodies, not just serum response.
Area of Science:
- Urology
- Infectious Diseases
- Microbiology
Background:
- Pyelonephritis is a serious kidney infection.
- The causative agents of pyelonephritis are typically bacteria.
- The role of Mycoplasma hominis in pyelonephritis requires further investigation.
Purpose of the Study:
- To investigate the potential role of Mycoplasma hominis as a causative agent of acute pyelonephritis in humans.
- To establish diagnostic criteria for Mycoplasma hominis-induced pyelonephritis.
Main Methods:
- Culture of Mycoplasma hominis from upper urinary tract specimens of patients with pyelonephritis.
- Serological testing for antibodies to Mycoplasma hominis in serum and urine.
- Analysis of clinical symptoms and patient history.
Main Results:
- Mycoplasma hominis was isolated from the upper urinary tract of 17 patients with acute pyelonephritis.
- In 12 of these patients, no other microorganisms were recovered.
- Antibodies to Mycoplasma hominis were detected in the urine of nine patients, and significant changes in serum antibody titers were observed in 13 patients.
Conclusions:
- Mycoplasma hominis is suggested as a potential cause of acute pyelonephritis, estimated in approximately 5% of cases.
- Diagnosis is supported by upper urinary tract culture and the presence of urine antibodies.
- Serum antibody response or culture from catheter-collected urine is insufficient for diagnosis.
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