Coxiella burnetii: Difference between revisions
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::*2.2 '''Non-cardiac organ disease''' | ::*2.2 '''Non-cardiac organ disease''' | ||
:::* Preferred regimen: [[Doxycycline]] | :::* Preferred regimen: [[Doxycycline]] 100 mg PO bid {{and}} [[hydroxychloroquine]] 200 mg PO tid | ||
:::* Note: childern and pregnant women | :::* Note: childern and pregnant women consultation recommended | ||
::* Postpartumwith serologic profile for chronic Q fever | ::*2.3 '''Postpartumwith serologic profile for chronic Q fever''' | ||
:::* Preferred regimen:[[Doxycycline]] | :::* Preferred regimen: [[Doxycycline]] 100 mg PO bid {{and}} [[hydroxychloroquine]] 200 mg PO tid for 12 months | ||
:::* Note: Women should only be treated postpartum if serologic titers remain elevated >12 months after delivery (immunoglobulin G phase I titer ≥1:1024) | :::* Note (1): Women should only be treated postpartum if serologic titers remain elevated >12 months after delivery (immunoglobulin G phase I titer ≥1:1024); Women treated during pregnancy for acute Q fever should be monitored similarly to other patients who are at high risk for progression to chronic disease (e.g., serologic monitoring at 3, 6, 12, 18, and 24 months after delivery) | ||
:::* Note (2): Post-Q fever fatigue syndrome- no current recommendation | |||
:::* Note:Post-Q fever fatigue syndrome- no current recommendation | |||
==References== | ==References== | ||
Revision as of 18:07, 21 July 2015
| Coxiella burnetii | ||||||||||||||
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| C. burnetii, the causative agent of Q fever C. burnetii, the causative agent of Q fever
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| Scientific classification | ||||||||||||||
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| Binomial name | ||||||||||||||
| Coxiella burnetii (Derrick 1939) Philip 1948 |
Coxiella burnetii is a species of intracellular, pathogenic bacteria, and is the causative agent of Q fever. The genus Coxiella is morphologically similar to the rickettsia, but with a variety of genetic and physiological differences. C. burnetii are small Gram negative bacteria with two growth phases, as well as a spore form which lies idle in soil.[1] It can survive standard disinfectants, and is resistant to many other environmental changes.[2]
Pathogenesis
The ID50 (the dose needed to infect 50% of experimental subjects) is one via inhalation— i.e. inhalation of one organism will yield disease in 50% of the population. Disease occurs in two states: An acute state presents with headaches, chills, and respiratory symptoms, and an insidious chronic stage.
While most infections clear up spontaneously, treatment with tetracycline or doxycycline appears to reduce the symptomatic duration and reduce the likelihood of chronic infection. A combination of erythromycin and rifampin is highly effective in curing and prevention of disease and so is vaccination with Q-vax vaccine (CSL).
Treatment
Antimicrobial regimen
- 1. Acute Q fever [3]
- 1.1 Adults
- Preferred Regimen: Doxycycline 100 mg PO bid for 14 days
- 1.2 Pediatric
- 1.2.1 ≥8 years old
- Preferred regimen:Doxycycline 2.2 mg/kg PO bid for 14 days (Maximum, 100 mg per dose)
- 1.2.2 <8 years old with high risk criteria
- Preferred regimen:Doxycycline 2.2 mg/kg PO bid for 14 days (Maximum, 100 mg per dose)
- 1.2.3 <8 years old with mild or uncomplicated illness
- Preferred regimen:Doxycycline 2.2 mg/kg PO bid for 5 days (Maximum, 100 mg per dose)
- Alternative regimen: (If patient remains febrile past 5 days of treatment) Trimethoprim/Sulfamethoxazole 4-20 mg/kg PO bid for 14 days (Maximum, 800 mg per dose)
- 1.3 Pregnant women
- Preferred regimen: Trimethoprim/sulfamethoxazole 160 mg/800 mg PO bid
- Note: Should be given throughout pregnancy
- 2. Chronic Q fever
- 2.1 Endocarditis or vascular infection
- Preferred regimen: Doxycycline 100 mg PO bid AND hydroxychloroquine 200 mg PO tid for ≥18 months
- Note: Childern and pregnant women consultation recommended
- 2.2 Non-cardiac organ disease
- Preferred regimen: Doxycycline 100 mg PO bid AND hydroxychloroquine 200 mg PO tid
- Note: childern and pregnant women consultation recommended
- 2.3 Postpartumwith serologic profile for chronic Q fever
- Preferred regimen: Doxycycline 100 mg PO bid AND hydroxychloroquine 200 mg PO tid for 12 months
- Note (1): Women should only be treated postpartum if serologic titers remain elevated >12 months after delivery (immunoglobulin G phase I titer ≥1:1024); Women treated during pregnancy for acute Q fever should be monitored similarly to other patients who are at high risk for progression to chronic disease (e.g., serologic monitoring at 3, 6, 12, 18, and 24 months after delivery)
- Note (2): Post-Q fever fatigue syndrome- no current recommendation
References
- ↑ Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0-8385-8529-9.
- ↑ Sankaran, Neeraja (2000). "Coxiella burnetii". Microbes and people : an A-Z of microorganisms in our lives. Phoenix, Arizona: The Oryx Press. p. 72. ISBN 1-57356-217-3. "In contrast to other rickettsiae, which are highly sensitive and easily killed by chemical disinfectants and changes in their surroundings, C. burnetii is highly resistant" & "Q fever". Centers for Disease Control and Prevention; National Center for Infectious Diseases; Division of Viral and Rickettsial Diseases; Viral and Rickettsial Zoonoses Branch. 2003-02013. Retrieved 2006-05-24. Check date values in:
|date=(help) "The organisms are resistant to heat, drying, and many common disinfectants." - ↑ "q fever".