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Chlamydiophilia 
pneumoniae 
Jordan Frandsen
Case Study: 
A 7 year old female reports to her physician complaining 
of an ear ache, cough, and a sore throat. Upon physical 
examination the doctor noted a crackling, wheezing 
cough. 
A throat culture was taken and revealed nothing. 
A chest x-ray showed a left lower lobe pneumoniae 
Blood was drawn for serologic testing while the patient 
received broad spectrum antibiotics
Serologic testing 
The Microparticle Agglutination Assay revealed a titer of 
antibodies of 1:310 
The serum immunoblot assay showed positive IgM and 
IgG against Chlamydiophilia pneumoniae.
Chlamydiophilia 
pneumoniae 
Gram-negative coccoid 
Non-motile, non-spore forming 
Obligate Intracellular bacterium 
Incubation period is about 21 days 
Two forms in nature: 
Elementary Body- infectious particle 
Reticulate Body- engages replication and growth
Clinical Presentation 
Symptoms can range from asymptomatic to severe 
Mild to severe pneumonia, bronchitis, pharyngitis, 
sinusitis, rarely death in healthy patients 
Chronic infections have been associated with 
Atherosclerosis, Alzheimer’s, and asthma. 
Can be a 1-4 week interval between initial symptoms and 
pulmonary involvement
Life Cycle 
6-8 hours after the EB enters the cell it develops into a 
noninfectious RB within the cytoplasmic vacuole 
There is about a 20 hour eclipse phase after entry when 
the EB develops into the RB. 
The genome is transcribed into RNA, proteins are 
synthesized and the DNA is replicated. 
18-24 hours after infection the RB divides by binary 
fission. 
After the outer cell wall is made the RB develops into a 
new infectious EB.
Life Cycle
Epidemiology 
2-5 million cases of pneumonia and 500,000 pneumonia-related 
hospitalizations occur in the US. 
Transmission is person-to-person by respiratory 
secretions. 
All ages are at risk, but school-age children are most 
common. 
Infection doesn’t produce immunity.
Diagnosis 
Difficult to grow 
Diagnosis is made using assays that show an increase in 
IgG or IgM 
Cultures are only positive about 50% of the time 
The Complement Fixation (CF) test can be used to detect 
genus specific LPS 
Microimmunofluorescence (MIF) uses an EB antigen
Treatment 
Macrolides are the first-line treatment 
Tetracyclines and Fluoroquinolones are also used 
Prolonged treatment is recommened (2-3 weeks) 
In severe case, intravenous antibiotics are used
Prevention 
There is no vaccine currently available 
The best way to avoid this organism is 
Good Hygiene 
Hand Washing 
Avoid contact with infected people
Sources 
http://www.cdc.gov/pneumonia/atypical/chlamydophila.htm 
l 
Kauppinen M, Pekka S, Pneumonia due to Chlamydia 
pneumoniae: prevalence, clinical features, diagnosis, and 
treatment, Clinical Infectious Diseases, 1995;21:S244-52. 
Guerra LG, Ho H, Verghese A, New pathogens in 
pneumonia, Medical Clinics of North America, 1994; 
78:967-985.
Questions?

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Micro presentation

  • 2. Case Study: A 7 year old female reports to her physician complaining of an ear ache, cough, and a sore throat. Upon physical examination the doctor noted a crackling, wheezing cough. A throat culture was taken and revealed nothing. A chest x-ray showed a left lower lobe pneumoniae Blood was drawn for serologic testing while the patient received broad spectrum antibiotics
  • 3. Serologic testing The Microparticle Agglutination Assay revealed a titer of antibodies of 1:310 The serum immunoblot assay showed positive IgM and IgG against Chlamydiophilia pneumoniae.
  • 4. Chlamydiophilia pneumoniae Gram-negative coccoid Non-motile, non-spore forming Obligate Intracellular bacterium Incubation period is about 21 days Two forms in nature: Elementary Body- infectious particle Reticulate Body- engages replication and growth
  • 5. Clinical Presentation Symptoms can range from asymptomatic to severe Mild to severe pneumonia, bronchitis, pharyngitis, sinusitis, rarely death in healthy patients Chronic infections have been associated with Atherosclerosis, Alzheimer’s, and asthma. Can be a 1-4 week interval between initial symptoms and pulmonary involvement
  • 6. Life Cycle 6-8 hours after the EB enters the cell it develops into a noninfectious RB within the cytoplasmic vacuole There is about a 20 hour eclipse phase after entry when the EB develops into the RB. The genome is transcribed into RNA, proteins are synthesized and the DNA is replicated. 18-24 hours after infection the RB divides by binary fission. After the outer cell wall is made the RB develops into a new infectious EB.
  • 8. Epidemiology 2-5 million cases of pneumonia and 500,000 pneumonia-related hospitalizations occur in the US. Transmission is person-to-person by respiratory secretions. All ages are at risk, but school-age children are most common. Infection doesn’t produce immunity.
  • 9. Diagnosis Difficult to grow Diagnosis is made using assays that show an increase in IgG or IgM Cultures are only positive about 50% of the time The Complement Fixation (CF) test can be used to detect genus specific LPS Microimmunofluorescence (MIF) uses an EB antigen
  • 10. Treatment Macrolides are the first-line treatment Tetracyclines and Fluoroquinolones are also used Prolonged treatment is recommened (2-3 weeks) In severe case, intravenous antibiotics are used
  • 11. Prevention There is no vaccine currently available The best way to avoid this organism is Good Hygiene Hand Washing Avoid contact with infected people
  • 12. Sources http://www.cdc.gov/pneumonia/atypical/chlamydophila.htm l Kauppinen M, Pekka S, Pneumonia due to Chlamydia pneumoniae: prevalence, clinical features, diagnosis, and treatment, Clinical Infectious Diseases, 1995;21:S244-52. Guerra LG, Ho H, Verghese A, New pathogens in pneumonia, Medical Clinics of North America, 1994; 78:967-985.