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Psittacosis (Chlamydia psittaci) (Ornithosis)
1996 Case Definition
Clinical description
An illness characterized by fever, chills, headache,
photophobia, cough, and myalgia
Laboratory criteria for diagnosis
- Isolation of Chlamydia psittaci from
respiratory secretions, or
- Fourfold or greater increase in antibody against C.
psittaci by complement fixation or microimmunofluorescence
(MIF) to a reciprocal titer of greater than or equal to 32
between paired acute- and convalescent-phase serum specimens,
or
- Presence of immunoglobulin M antibody against C.
psittaci by MIF to a reciprocal titer of greater than
or equal to 16
Case classification
Probable: a clinically
compatible case that is epidemiologically linked to a confirmed
case or that has supportive serology (e.g., C. psittaci titer
of greater than or equal to 32 in one or more serum specimens
obtained after onset of symptoms)
Confirmed: a clinically compatible case
that is laboratory confirmed
Comment
The serologic findings by CF also may occur as
a result of infection with Chlamydia pneumoniae or Chlamydia
trachomatis. The MIF might be more specific for infection
with C. psittaci, but experience with and availability
of this newer test are more limited.
See also:
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