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{{brucellosis}}
{{Taxobox
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''B. suis''<br/>
''B. suis''<br/>
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__NOTOC__
{{SI}}
{{About0|brucellosis}}
{{CMG}} {{AE}} {{DL}}, {{VD}}


==Overview==
==Overview==
'''''Brucella''''' is a [[genus]] of [[Gram-negative]] [[bacterium|bacteria]].<ref name=Sherris>{{cite book | author = Ryan KJ, Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | publisher = McGraw Hill | year = 2004 | isbn = 0-8385-8529-9 }}</ref> They are small (0.5 to 0.7 by 0.6 to 1.5 µm), non-[[motile]], encapsulated [[coccobacillus|coccobacilli]].
Human brucellosis is caused by four [[Brucella|Brucellae]] species: [[Brucella abortus|''B. abortus'']], [[Brucella canis|''B. canis'']], [[Brucella melitensis|''B. melitensis'']], and ''B. suis''.<ref>{{Cite web|url=http://www.who.int/csr/resources/publications/Brucellosis.pdf|title=WHO|last=|first=|date=|website=|publisher=|access-date=}}</ref>
 
''Brucella'' is the cause of [[brucellosis]], a true [[zoonosis|zoonotic]] disease (i.e. human-to-human transmission has not been identified).<ref name=Sherris /> It is transmitted by ingesting infected food, direct contact with an infected animal, or inhalation of aerosols.  Minimum infectious exposure is between 10 - 100 organisms. [[Brucellosis]] primarily occurs through occupational exposure (e.g. exposure to cattle, sheep, pigs), but also by consumption of unpasteurised milk products.
 
There are a few different species of ''Brucella'', each with a slightly different presentation, such as B. melitensis, B. abortus, B. suis and B. citicosis.
 
==Laboratory isolation==
''Brucella'' are slow-growing, but may be isolated from normal blood cultures using standard media.  In traditional blood culture media, prolonged incubation (up to 6 weeks) may be required, but on modern automated machines the cultures often come positive within seven days.  On [[Gram stain]] they appear as dense clumps of Gram-negative coccobacilli and are exceedingly difficult to see.
 
Laboratory acquired brucellosis is common.<ref name=Robichaud_2004>{{cite journal |author=Robichaud S, Libman M, Behr M, Rubin E |title=Prevention of laboratory-acquired brucellosis |journal=Clin. Infect. Dis. |volume=38 |issue=12 |pages=e119-22 |year=2004 |pmid=15227634 |doi=10.1086/421024}}</ref>  This most often happens when the disease is not thought of until cultures become positive, by which time the specimens have already been handled by a number of laboratory staff. The idea of preventative treatment is to stop people who have been exposed to ''Brucella'' from becoming unwell with the disease.
 
There are no clinical trials to be relied on as a guide for optimal treatment, but a three week course of [[rifampicin]] and [[doxycycline]] twice daily is the combination most often used, and appears to be efficacious;<ref name=Robichaud_2004 /><ref name="Maley2006">{{cite journal |author=Maley MW, Kociuba K, Chan RC |title=Prevention of laboratory-acquired brucellosis: significant side effects of prophylaxis |journal=Clin. Infect. Dis. |volume=42 |issue=3 |pages=433-4 |year=2006 |pmid=16392095 |doi=10.1086/499112}}</ref> the advantage of this regimen is that it can be taken by mouth and there are no injections, however, a high rate of side effects (nausea, vomiting, loss of appetite) has also been reported.<ref name="Maley2006"/>
 
==Blue light study==
In a study published in ''Science'' magazine in August of 2007, it was revealed that ''Brucella'' reacts strongly to the presence of the blue spectrum in natural light, reproducing at a great rate and becoming infectious.  Conversely, depriving ''Brucella'' of the blue wavelengths dropped its reproductive rate by 90%, a result one of the co-authors called "spectacular."<!-- presumably with no pun intended.--><ref name="SciNEWS">[http://sciencenow.sciencemag.org/cgi/content/full/2007/823/2 "Deadly in the Daylight"] August 23, 2007 in ''ScienceNOW Daily News''.  Accessed September 8, 2007.</ref><ref name="SCIENCE">[http://www.sciencemag.org/cgi/content/abstract/317/5841/1090 "Blue-Light-Activated Histidine Kinases: Two-Component Sensors in Bacteria
"], August 24 2007, ''Science'' Vol. 317:5841, pp. 1090 - 1093  Accessed September 8, 2007.</ref>


===Treatment===
==Causes==
* Uncomplicated brucellosis in adults and children eight years of age and older <ref>{{cite book | last = Corbel | first = Michael | title = Brucellosis in humans and animals | publisher = World Health Organization | location = Geneva | year = 2006 | isbn = 9241547138 }}</ref>
*'''''[[Brucella]]''''' is a genus of [[gram-negative bacteria]].<ref name="Sherris">{{cite book | author = Ryan KJ, Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | publisher = McGraw Hill | year = 2004 | isbn = 0-8385-8529-9 }}</ref>They are small (0.5 to 0.7 by 0.6 to 1.5 µm), non-motile and encapsulated [[coccobacilli]].
:* Preferred regimen: [[Doxycycline]] 100 mg  PO bid for 6 weeks {{or}} [[Tetracycline]] 500 mg every six hours orally administered for at least six weeks
:* NOTE: [[Streptomycin]] 1 g/day intramuscularly administered for the first two to three weeks of therapy {{or}} [[Gentamicin]] 5mg/kg/day intravenously or intramuscularly for 7-10 days in combination with [[Doxycycline]] administered for six weeks
:* Alternative regimen (1): [[Doxycycline]] 200 mg/day orally {{and}} [[Rifampicin]] 600–900 mg/day orally, both drugs administered for six weeks
:* Alternative regimen (2): Fluoroquinolones
:* NTOE: Quinolones should always be used in combination with other drugs, such as Doxycycline or Rifampicin
:* Alternative regimen (3): [[TMP/SMZ]] in a fixed ratio of 1:5 (80 mg TMP/400 mg SMZ)
:* NOTE: TMP/SMZ should always be used in combination with another agent, such as Doxycycline, Rifampicin or Streptomycin


* Complications of brucellosis
=== Brucella species ===
:* Spondylitis
''[[Brucella]]'' species have been found primarily in mammals. <ref name="pmid15930423">{{cite journal| author=Pappas G, Akritidis N, Bosilkovski M, Tsianos E| title=Brucellosis. | journal=N Engl J Med | year= 2005 | volume= 352 | issue= 22 | pages= 2325-36 | pmid=15930423 | doi=10.1056/NEJMra050570 | pmc= | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15930423  }} </ref> Brucellla species, with their host and degree of virulence is described below:<ref>{{Cite web|url=http://www.who.int/csr/resources/publications/Brucellosis.pdf|title=WHO|last=|first=|date=|website=|publisher=|access-date=}}</ref>
::* Preferred regimen: Continuation of [[Doxycycline]] for eight weeks or more; Surgical drainage is rarely necessary.
{| style="border: 0px; font-size: 90%; margin: 3px;" align="center"
:* Neurobrucellosis
|+
::* Preferred regimen: [[Rifampicin]] {{or}} [[Trimethoprim/sulfamethoxazole]], be added to the standard regimen of [[Doxycycline]] {{and}} [[Streptomycin]] for 6-8 weeks, and possibly longer, depending on the clinical response
! style="width: 180px;background: #4479BA" |{{fontcolor|#FFF| Species}}
:* Brucella endocarditis
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| Host}}
::* Preferred regimen: [[Doxycycline]] {{and}} an [[Aminoglycoside]] for at least eight weeks, and therapy should be continued for several weeks after surgery when valve replacement is necessary
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| Human Virulence}}
::* NOTE: [[Rifampicin]] {{or}} [[Trimethoprim/sulfamethoxazole]] are used for their ability to penetrate cell membranes
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | ''B. melitensis''
| style="background: #F5F5F5; text-align:center" | Goats, sheep, cattle, buffaloes, dogs and camels
| style="background: #F5F5F5; text-align:center" | ++++
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | ''B. abortus''
| style="background: #F5F5F5; text-align:center" | Cattle, buffaloes, bison, dogs, elk, and horses
| style="background: #F5F5F5; text-align:center" | ++/+++
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | ''B. canis''
| style="background: #F5F5F5; bold; text-align:center" | Dogs
| style="background: #F5F5F5; text-align:center" | +
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | ''B. suis''
| style="background: #F5F5F5; text-align:center" | Pigs and sheep
| style="background: #F5F5F5; text-align:center" | +
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | ''B. ovis''
| style="background: #F5F5F5; text-align:center" | Sheep
| style="background: #F5F5F5; text-align:center" | -
|-
|}


* For children less than eight years of age
=== Tests to differentiate brucella species ===
:* Preferred regimen: [[TMP/SMZ]] 8/40 mg/ kg/day bid orally administered for six weeks {{and}} [[Streptomycin]] 30 mg/kg/day once daily intramuscularly administered for three weeks {{or}} [[Gentamicin]] 5 mg/kg/day once daily intravenously or intramuscularly administered for 7-10 days
Following tests may be used to differentiate between the different species of brucella.<ref>{{Cite web|url=http://www.who.int/csr/resources/publications/Brucellosis.pdf|title=WHO|last=|first=|date=|website=|publisher=|access-date=}}</ref>
:* Alternative regimen (1): [[TMP/SMZ]] {{and}} [[Rifampicin]] 15 mg/kg/day orally each administered for 6 weeks
{| style="border: 0px; font-size: 90%; margin: 3px;" align="center"
 
|+
:* Alternative regimen (2): [[Rifampicin]] {{and}} an [[Aminoglycoside]]
! style="width: 180px;background: #4479BA" |{{fontcolor|#FFF| Test}}
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. melitensis'' }}
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. abortus'' }}
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. suis'' }}
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. ovis'' }}
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. canis'' }}
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | Need to CO2
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | Production of H2S
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | -
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | Growth on basic fushin 0.002%
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | Growth on thionin 0.004%
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | +
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | Growth on thionin 0.002%
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | +
|-
| style="width: 120px;font-weight: bold;background: #DCDCDC" | Destroy with Tb phage
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | +
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | -
| style="background: #F5F5F5; text-align:center" | -
|-
|}


==References==
==References==
{{reflist|2}}
{{reflist|2}}


==External links==
[[Category:Disease]]
* [http://www.hpa.org.uk/infections/topics_az/zoonoses/brucellosis/menu.htm Brucellosis]
[[Category:Up-To-Date]]
 
[[Category:Pulmonology]]
*[http://www.genomesonline.org/search.cgi?colcol=all&goldstamp=ALL&gen_type=ALL&org_name1=genus&gensp=Brucella&org_domain=ALL&org_status=ALL&size2=ALL&org_size=Kb&gen_gc=ALL&phylogeny2=ALL&gen_institution=ALL&gen_funding=ALL&gen_data=ALL&cont=ALL&gen_country=ALL&gen_pheno=ALL&gen_eco=ALL&gen_disease=ALL&gen_relevance=ALL&gen_avail=ALL&selection=submit+search Brucella Genome Projects] (from [http://www.genomesonline.org Genomes OnLine Database])
[[Category:Hepatology]]
 
[[Category:Rheumatology]]
*[http://img.jgi.doe.gov/cgi-bin/pub/main.cgi?section=TaxonList&page=lineageMicrobes&genus=Brucella Comparative Analysis of Brucella Genomes] (at [[United_States_Department_of_Energy|DOE's]] [[Integrated_Microbial_Genomes_System|IMG system]])
[[Category:Nephrology]]
 
*[http://bbp.hegroup.org/ Brucella Bioinformatics Portal]
 
[[Category:Rhizobiales]]
[[Category:Gram negative bacteria]]
 
 
 
[[de:Brucellen]]
[[fa:بروسلا]]
[[fr:Brucella]]
[[it:Brucella]]
[[he:Brucella]]
[[ru:Бруцелла]]
[[uk:Бруцела]]
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Latest revision as of 20:44, 29 July 2020

Brucellosis Microchapters

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Brucella

Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Alpha Proteobacteria
Order: Rhizobiales
Family: Brucellaceae
Genus: Brucella
Species

B. abortus
B. canis
B. melitensis
B. neotomae
B. ovis
B. suis

This page is about microbiologic aspects of the organism(s).  For clinical aspects of the disease, see brucellosis.

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Danitza Lukac, Vishal Devarkonda, M.B.B.S[2]

Overview

Human brucellosis is caused by four Brucellae species: B. abortus, B. canis, B. melitensis, and B. suis.[1]

Causes

Brucella species

Brucella species have been found primarily in mammals. [3] Brucellla species, with their host and degree of virulence is described below:[4]

Species Host Human Virulence
B. melitensis Goats, sheep, cattle, buffaloes, dogs and camels ++++
B. abortus Cattle, buffaloes, bison, dogs, elk, and horses ++/+++
B. canis Dogs +
B. suis Pigs and sheep +
B. ovis Sheep -

Tests to differentiate brucella species

Following tests may be used to differentiate between the different species of brucella.[5]

Test B. melitensis B. abortus B. suis B. ovis B. canis
Need to CO2 - + - + -
Production of H2S - + + - -
Growth on basic fushin 0.002% + + - + -
Growth on thionin 0.004% - - + + +
Growth on thionin 0.002% + - + + +
Destroy with Tb phage - + - - -

References

  1. ↑ "WHO" (PDF).
  2. ↑ Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0-8385-8529-9.
  3. ↑ Pappas G, Akritidis N, Bosilkovski M, Tsianos E (2005). "Brucellosis". N Engl J Med. 352 (22): 2325–36. doi:10.1056/NEJMra050570. PMID 15930423.
  4. ↑ "WHO" (PDF).
  5. ↑ "WHO" (PDF).
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