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==Overview== | ==Overview== | ||
The [[differential diagnosis]] of anthrax includes a wide range of [[infectious]] and non-[[infectious]] conditions. Depending on the mode of anthrax exposure in the patient ([[cutaneous]], [[ingestion]], [[inhalation]] or [[injection]]), there will be different forms of the disease.<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> A history of exposure to contaminated animal materials, occupational exposure, and living in an [[endemic]] area, | The [[differential diagnosis]] of anthrax includes a wide range of [[infectious]] and non-[[infectious]] conditions. Depending on the mode of anthrax exposure in the patient ([[cutaneous]], [[ingestion]], [[inhalation]] or [[injection]]), there will be different forms of the disease.<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> A history of exposure to contaminated animal materials, occupational exposure, and living in an [[endemic]] area, is crucial when considering the [[diagnosis]] of anthrax. Additional tests to isolate ''[[Bacillus anthracis]]'' are required to differentiate [[anthrax]] from other [[diagnosis|diagnoses]], thereby confirming the correct [[etiologic]] agent. | ||
==Differential Diagnosis== | ==Differential Diagnosis== | ||
===Cutaneous Anthrax=== | ===Cutaneous Anthrax=== | ||
* A history of exposure to contaminated animal materials, occupational exposure, and living in an endemic area is crucial when considering a diagnosis of anthrax. A painless, [[pruritus|pruritic]] [[papule]], surrounding [[vesicle]]s and [[edema]], usually on an exposed region of the body should raise a concern of [[cutaneous anthrax]], which is confirmed by the demonstration of [[Gram-positive]] encapsulated [[bacilli]] from the lesion and/or positive culture for ''[[Bacillus anthracis]]'' from the lesion and/or positive specialized tests. | * A history of exposure to contaminated animal materials, occupational exposure, and living in an endemic area is crucial when considering a [[diagnosis]] of [[anthrax]]. A painless, [[pruritus|pruritic]] [[papule]], surrounding [[vesicle]]s and [[edema]], usually on an exposed region of the body should raise a concern of [[cutaneous anthrax]], which is confirmed by the demonstration of [[Gram-positive]] [[capsule|encapsulated]] [[bacilli]] from the lesion, and/or positive culture for ''[[Bacillus anthracis]]'' from the lesion and/or positive specialized tests. | ||
* The differential diagnosis of the anthrax [[eschar]] includes a wide range of infectious and non-infectious conditions including:<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | * The [[differential diagnosis]] of the anthrax [[eschar]] includes a wide range of [[infectious]] and non-[[infectious]] conditions, including:<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | ||
:* [[Boil]] (early lesion) | :* [[Boil]] (early lesion) | ||
:* [[Spider bite|Arachnid bites]] | :* [[Spider bite|Arachnid bites]] | ||
| Line 31: | Line 31: | ||
:* [[Herpes]] | :* [[Herpes]] | ||
* Generally these other diseases and conditions lack the characteristic [[edema]] of anthrax. The absence of [[pus]], the lack of [[pain]], and the patient’s occupation may provide further diagnostic clues. The outbreak of [[Rift Valley fever]], initially thought to be anthrax in livestock, also affected numerous humans. | * Generally these other diseases and conditions lack the characteristic [[edema]] of anthrax. The absence of [[pus]], the lack of [[pain]], and the patient’s occupation may provide further [[diagnostic]] clues. The outbreak of [[Rift Valley fever]], initially thought to be anthrax in livestock, also affected numerous humans. | ||
* In the differential diagnosis of the severe forms, [[orbital cellulitis]], [[dacryocystitis]] and [[deep neck infection|deep tissue infection of the neck]] should be considered in the case of severe anthrax lesions involving the face, neck and anterior chest wall. [[necrotizing fasciitis|Necrotizing soft tissue infections]], particularly [[Streptococcus pyogenes|group A streptococcal infections]] and [[gas gangrene]], and severe [[cellulitis]] due to [[staphylococci]], should also be considered in the differential diagnosis of severe forms of cutaneous anthrax. [[gas gangrene|Gas]] and [[abscess]] formation are not observed in patients with cutaneous anthrax. [[Abscess|Abscess formation]] is only seen when the lesion is infected with other bacteria such as [[streptococci]] or [[staphylococci]]. | * In the [[differential diagnosis]] of the severe forms, [[orbital cellulitis]], [[dacryocystitis]] and [[deep neck infection|deep tissue infection of the neck]], should be considered in the case of severe anthrax lesions involving the face, neck and anterior chest wall. [[necrotizing fasciitis|Necrotizing soft tissue infections]], particularly [[Streptococcus pyogenes|group A streptococcal infections]] and [[gas gangrene]], and severe [[cellulitis]] due to [[staphylococci]], should also be considered in the [[differential diagnosis]] of severe forms of cutaneous anthrax. [[gas gangrene|Gas]] and [[abscess]] formation are not observed in patients with cutaneous anthrax. [[Abscess|Abscess formation]] is only seen when the lesion is [[infected]] with other [[bacteria]], such as [[streptococci]] or [[staphylococci]]. | ||
===Ingestional Anthrax (Oropharyngeal and Gastrointestinal Anthrax)=== | ===Ingestional Anthrax (Oropharyngeal and Gastrointestinal Anthrax)=== | ||
====Oropharyngeal Anthrax==== | ====Oropharyngeal Anthrax==== | ||
* The list of differential diagnosis of oropharyngeal anthrax | * The list of [[differential diagnosis]] of oropharyngeal anthrax includes: | ||
** [[Diphtheria]] | ** [[Diphtheria]] | ||
** Complicated [[tonsillitis]] | ** Complicated [[tonsillitis]] | ||
** [[ | ** [[Streptococcal pharyngitis]] | ||
** [[Vincent's angina]] | ** [[Vincent's angina]] | ||
** [[Ludwig's angina]] | ** [[Ludwig's angina]] | ||
| Line 47: | Line 47: | ||
====Gastrointestinal Anthrax==== | ====Gastrointestinal Anthrax==== | ||
* The list of differential diagnosis of gastrointestinal anthrax | * The list of [[differential diagnosis]] of gastrointestinal anthrax includes: | ||
** [[Food poisoning]] (in the early stages of intestinal anthrax) | ** [[Food poisoning]] (in the early stages of intestinal anthrax) | ||
** [[Acute abdomen]] | ** [[Acute abdomen]] | ||
** Hemorrhagic [[gastroenteritis]] | ** [[Hemorrhage|Hemorrhagic]] [[gastroenteritis]] | ||
*** Necrotizing [[enteritis]] caused by ''[[Clostridium perfringens]]'' | *** [[Necrotizing]] [[enteritis]] caused by ''[[Clostridium perfringens]]'' | ||
*** [[Dysentery]] (amebic or bacterial)<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | *** [[Dysentery]] ([[Amoeba|amebic]] or [[bacterial]])<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | ||
===Inhalational Anthrax (Pulmonary, Mediastinal, and Respiratory Anthrax)=== | ===Inhalational Anthrax (Pulmonary, Mediastinal, and Respiratory Anthrax)=== | ||
* The list of differential diagnosis of inhalation anthrax | * The list of [[differential diagnosis]] of inhalation anthrax includes: | ||
** ''[[Mycoplasma pneumoniae]]'' | ** ''[[Mycoplasma pneumoniae]]'' | ||
** [[Legionnaires' disease]] | ** [[Legionnaires' disease]] | ||
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===Anthrax Meningitis=== | ===Anthrax Meningitis=== | ||
* The list of differential diagnosis of anthrax meningitis | * [[Meningitis]] is a potential [[complication]] of [[anthrax]] [[infection]]. The list of [[differential diagnosis]] of anthrax meningitis includes: | ||
** Acute [[meningitis]] | ** Acute [[meningitis]] | ||
** Cerebral [[malaria]] | ** Cerebral [[malaria]] | ||
** [[Subarachnoid hemorrhage]] | ** [[Subarachnoid hemorrhage]] | ||
* The definitive diagnosis is obtained by visualization of the capsulated [[bacilli]] in the [[cerebrospinal fluid]] and/or by culture.<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | * The definitive [[diagnosis]] is obtained by visualization of the [[capsule|capsulated]] [[bacilli]] in the [[cerebrospinal fluid]] and/or by [[Cell culture|culture]].<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | ||
===Anthrax Sepsis=== | ===Anthrax Sepsis=== | ||
* [[Sepsis]] due to other bacteria should be considered. | * [[Sepsis]] is a potential [[complication]] of [[anthrax]] [[infection]]. [[Sepsis]] due to other [[bacteria]] should be considered. | ||
* The definitive diagnosis of anthrax is made by the isolation of ''[[Bacillus anthracis]]'' from the primary lesion | * The definitive [[diagnosis]] of anthrax is made by the isolation of ''[[Bacillus anthracis]]'' from the primary lesion, from [[blood cultures]] or by detection of the [[toxin]] or [[DNA]] of ''[[Bacillus anthracis|B. anthracis]]'' in these specimens.<ref name=WHO>{{cite book | last = Turnbull | first = Peter | title = Anthrax in humans and animals | publisher = World Health Organization | location = Geneva, Switzerland | year = 2008 | isbn = 9789241547536 }}</ref> | ||
==References== | ==References== | ||
Revision as of 20:18, 20 July 2014
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
The differential diagnosis of anthrax includes a wide range of infectious and non-infectious conditions. Depending on the mode of anthrax exposure in the patient (cutaneous, ingestion, inhalation or injection), there will be different forms of the disease.[1] A history of exposure to contaminated animal materials, occupational exposure, and living in an endemic area, is crucial when considering the diagnosis of anthrax. Additional tests to isolate Bacillus anthracis are required to differentiate anthrax from other diagnoses, thereby confirming the correct etiologic agent.
Differential Diagnosis
Cutaneous Anthrax
- A history of exposure to contaminated animal materials, occupational exposure, and living in an endemic area is crucial when considering a diagnosis of anthrax. A painless, pruritic papule, surrounding vesicles and edema, usually on an exposed region of the body should raise a concern of cutaneous anthrax, which is confirmed by the demonstration of Gram-positive encapsulated bacilli from the lesion, and/or positive culture for Bacillus anthracis from the lesion and/or positive specialized tests.
- The differential diagnosis of the anthrax eschar includes a wide range of infectious and non-infectious conditions, including:[1]
- Generally these other diseases and conditions lack the characteristic edema of anthrax. The absence of pus, the lack of pain, and the patient’s occupation may provide further diagnostic clues. The outbreak of Rift Valley fever, initially thought to be anthrax in livestock, also affected numerous humans.
- In the differential diagnosis of the severe forms, orbital cellulitis, dacryocystitis and deep tissue infection of the neck, should be considered in the case of severe anthrax lesions involving the face, neck and anterior chest wall. Necrotizing soft tissue infections, particularly group A streptococcal infections and gas gangrene, and severe cellulitis due to staphylococci, should also be considered in the differential diagnosis of severe forms of cutaneous anthrax. Gas and abscess formation are not observed in patients with cutaneous anthrax. Abscess formation is only seen when the lesion is infected with other bacteria, such as streptococci or staphylococci.
Ingestional Anthrax (Oropharyngeal and Gastrointestinal Anthrax)
Oropharyngeal Anthrax
- The list of differential diagnosis of oropharyngeal anthrax includes:
- Diphtheria
- Complicated tonsillitis
- Streptococcal pharyngitis
- Vincent's angina
- Ludwig's angina
- Parapharyngeal abscess
- Deep-tissue infection of the neck
Gastrointestinal Anthrax
- The list of differential diagnosis of gastrointestinal anthrax includes:
- Food poisoning (in the early stages of intestinal anthrax)
- Acute abdomen
- Hemorrhagic gastroenteritis
- Necrotizing enteritis caused by Clostridium perfringens
- Dysentery (amebic or bacterial)[1]
Inhalational Anthrax (Pulmonary, Mediastinal, and Respiratory Anthrax)
- The list of differential diagnosis of inhalation anthrax includes:
Anthrax Meningitis
- Meningitis is a potential complication of anthrax infection. The list of differential diagnosis of anthrax meningitis includes:
- Acute meningitis
- Cerebral malaria
- Subarachnoid hemorrhage
- The definitive diagnosis is obtained by visualization of the capsulated bacilli in the cerebrospinal fluid and/or by culture.[1]
Anthrax Sepsis
- Sepsis is a potential complication of anthrax infection. Sepsis due to other bacteria should be considered.
- The definitive diagnosis of anthrax is made by the isolation of Bacillus anthracis from the primary lesion, from blood cultures or by detection of the toxin or DNA of B. anthracis in these specimens.[1]