出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2016/01/16 17:56:09」(JST)
気管支敗血症菌 | |||||||||||||||||||||
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B. bronchisepticaの電子顕微鏡写真
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Bordetella bronchiseptica (Ferry 1912) Moreno-López 1952 |
気管支敗血症菌(Bordetella bronchiseptica、ボルデテラ・ブロンキセプティカ)とはボルデテラ属(Bordetella)に属する細菌であり、感染性気管支炎の原因となる[1]。気管支敗血症菌は長期間生活環境で持続することができ[2]、ヒトに固有の百日咳を引き起こす百日咳菌(Bordetella pertussis)と近縁である[3]。
B. pertussisやB. parapertussisとは異なり、B. bronchisepticaはヒトへは感染せず、ネコ、イヌ、ウサギなどの小型の哺乳類の気道に感染する[3]。
B. bronchisepticaはB. pertussisの特徴である百日咳毒素(en:pertussis toxin)を発現しないが、遺伝子によると両者は非常に近縁である。[4],[5]
獣医学において、B. bronchisepticaは複数種の動物を宿主として病原性を示す。B. bronchisepticaとPasteurella multocidaの混合感染は発育阻害や鼻甲介の変形を引き起こす豚萎縮性鼻炎の原因となる[6]。B. bronchiseptica はイヌやウサギにおける急性気管気管支炎の原因となる[7]。B. bronchisepticaは鼻道においてよく見つけられる。B. bronchisepticaはスナッフルとして知られている無症状様感染症の原因と誤解されるが、実際はPseudomonas multocidaとB. bronchisepticaが同時に鼻腔に混合感染することを原因とする[8]。
Bordetella bronchiseptica | |
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Scanning electron micrograph of B. bronchiseptica | |
Scientific classification | |
Kingdom: | Bacteria |
Phylum: | Proteobacteria |
Class: | Beta Proteobacteria |
Order: | Burkholderiales |
Family: | Alcaligenaceae |
Genus: | Bordetella |
Species: | B. bronchiseptica |
Binomial name | |
Bordetella bronchiseptica (Ferry 1912) |
Bordetella bronchiseptica | |
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Classification and external resources | |
ICD-10 | A37.8 |
ICD-9-CM | 033.8 |
[edit on Wikidata]
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Bordetella bronchiseptica is a small, Gram-negative, rod-shaped bacterium of the genus Bordetella.[1] It can cause infectious bronchitis in dogs and other animals, [2] but rarely infects humans.[3] Closely related to B. pertussis[4]—the obligate human pathogen that causes pertussis (whooping cough); B. bronchiseptica can persist in the environment for extended periods.[5]
Humans are not natural carriers of B. bronchiseptica, which typically infects the respiratory tracts of smaller mammals (cats, dogs, rabbits, etc.).[4] People are more likely to be infected by B. pertussis or B. parapertussis. Unlike B. pertussis, B. bronchiseptica is generally resistant to macrolide antibiotics. It is also generally resistant to cephalosporins. Some human cases have been successfully treated with trimethoprim/sulfamethoxazole and fluoroquinolones.
B. bronchiseptica does not express pertussis toxin, which is one of the characteristic virulence factors of B. pertussis, but it has the genes to do so, highlighting the close evolutionary relationship between the two species.[6],[7]
In veterinary medicine, B. bronchiseptica leads to a range of pathologies in different hosts. It is a serious disease of dogs, pigs, and rabbits, and has been seen in cats, horses, and seals. A PCR test for the pathogen exists.[8]
In pigs, B. bronchiseptica and Pasteurella multocida act synergistically to cause atrophic rhinitis, a disease resulting in arrested growth and distortion of the turbinates in the nasal terminus (snout).[9]
In dogs, B. bronchiseptica causes acute tracheobronchitis,[10] which typically has a harsh, honking cough. Kennel cough can also be caused by canine adenovirus-2 or canine parainfluenza virus or a combination of pathogens.[8]
In rabbits, B. bronchiseptica is often found in the nasal tract. It is often assumed to cause a nearly asymptomatic infection known as snuffles, but the causative agent for that disease is Pasteurella multocida; B. bronchiseptica often co-infects the nasal passage at the same time.[11]
Cats infected with B. bronchiseptica have been seen with tracheobronchitis, conjunctivitis, and rhinitis (upper respiratory tract infection - URI), mandibular lymphadenopathy, and pneumonia. However, URI in cats can also be caused by herpesvirus, calicivirus, Mycoplasma species, or Chlamydia psittaci.[8] An intranasal vaccine exists for cats.[12]
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リンク元 | 「ボルデテラ・ブロンキセプチカ」「気管支敗血症菌」「B. bronchiseptica」 |
関連記事 | 「bronchiseptica」 |
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