Table 5

Aetiology studies looking for atypical organisms

Reference [evidence level]AgeYear and SettingTestsTotal episodesMycoplasma, % (n)Chlamydia, % (n)Mixed, % (n)
Kurz52 [II]2 months–18 years2006–7, Austria, IPNPA culture PCR serology1126.7 (4 of 60 tested)
Principi53 [Ib]2–14 years1998–9, Italy, IPSerology NPA PCR41835.8 (150)11 (46)6 (26)
Baer54 [II]1–18 years1999–2000, Switzerland, IPSerology NPA PCR5032 (16)
1–3 years: 22%
>3–7 years: 35%
>7 years: 40%
8 (4)6 (3)
Somer55 [II]2 months–15 years1996–8, Turkey, IPSerology14027 (38)5 (7)?0
Korppi56 [II]<15 years1981–2, Finland, IP+OPSerology (updated from previous study)20130 (61)
0–4 years: 9%
5–9 years: 40%
10–14 years: 67%
14 (29)
6%
13%
35%
5 (10)
  • IP, inpatients; NPA PCR, nasopharyngeal PCR; OP, outpatients.