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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==
* 1.'''Uncomplicated brucellosis in adults and children ≥8yrs of age  '''<ref>{{cite book | last = Corbel | first = Michael | title = Brucellosis in humans and animals | publisher = World Health Organization | location = Geneva | year = 2006 | isbn = 9241547138 }}</ref>, <ref>{{cite book | last = Bennett | first = John | title = Mandell, Douglas, and Bennett's principles and practice of infectious diseases | publisher = Elsevier/Saunders | location = Philadelphia, PA | year = 2015 | isbn = 978-1455748013 }}</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 {{and}} [[Streptomycin]] 1 g/day IM  for  2-3 weeks 
:* Alternative regimen (1): [[Doxycycline]] 100 mg/day PO for six weeks {{and}}[[Gentamicin]] 5mg/kg IM  for 7-days   
:* Alternative regimen (2): [[Gentamicin]] 5mg/kg/dayIV/ IM  for 7-10 days  {{and}} [[Rifampicin]] 600–900 mg/day PO for six weeks


*2.'''Complications of brucellosis'''
=== Brucella species ===
:*2.1Spondylitis
''[[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:[[ Doxycycline]] for 3 months  {{and}} [[Streptomycin]] for 2 to 3 weeks.
{| style="border: 0px; font-size: 90%; margin: 3px;" align="center"
:*2.2  Neurobrucellosis
|+
::* Preferred regimen: [[Ceftriaxone]] 2 mg IV bid for 1 month {{and}} Doxycycline 100 mg PO bid for 4-5 month {{and}} [[Rifampicin]] 600–900 mg/day PO for  4-5 month
! style="width: 180px;background: #4479BA" |{{fontcolor|#FFF| Species}}
:*2.3 Brucella endocarditis
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| Host}}
::* Preferred regimen: [[Doxycycline]] {{and}} an [[Aminoglycoside]] for at least 8 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" | -
|-
|}


*3. '''Pregnancy'''
=== Tests to differentiate brucella species ===
:* Preferred regimen:[[Rifampin]] 900 mg PO qd  for 6 weeks
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>
::* NOTE: Adding [[Trimethoprim-sulfamethoxazole]] can be considered, but this option should probably be avoided preceding the 13th week and after the 36th week of gestation because of concern about teratogenicity and kernicterus.
{| style="border: 0px; font-size: 90%; margin: 3px;" align="center"
|+
* 4.'''For children < 8 yrs of age'''
! style="width: 180px;background: #4479BA" |{{fontcolor|#FFF| Test}}
:* Preferred regimen: [[TMP/SMZ]] 8/40 mg/ kg/day bid PO  for 6 weeks {{and}} [[Streptomycin]] 30 mg/kg/day IM qd  for 3 weeks {{or}} [[Gentamicin]] 5 mg/kg/day IM/ IV qd  for 7-10 days
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. melitensis'' }}
:* Alternative regimen (1): [[TMP/SMZ]] {{and}} [[Rifampicin]] 15 mg/kg/day PO for 6 weeks
! style="width: 120px;background: #4479BA" |{{fontcolor|#FFF| ''B. abortus'' }}
:* Alternative regimen (2): [[Rifampicin]] {{and}} an [[Aminoglycoside]]
! 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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