Difference between revisions of "Bacillus cereus"

(Pathogenesis)
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*Known for causing foodborne illness in humans, though some strains are probiotic
 
*Known for causing foodborne illness in humans, though some strains are probiotic
 
*Classically associated with "fried rice syndrome"
 
*Classically associated with "fried rice syndrome"
 +
*8-16 hour incubation time
  
 
===Pathogenesis===
 
===Pathogenesis===
 
*The emetic form is commonly caused by rice cooked for a time and temperature insufficient to kill any spores present, then improperly refrigerated. It can produce a toxin which is not inactivated by later reheating.  This form leads to nausea and vomiting one to five hours after consumption. It can be difficult to distinguish from other short-term bacterial foodborne intoxications such as by Staphylococcus aureus.
 
*The emetic form is commonly caused by rice cooked for a time and temperature insufficient to kill any spores present, then improperly refrigerated. It can produce a toxin which is not inactivated by later reheating.  This form leads to nausea and vomiting one to five hours after consumption. It can be difficult to distinguish from other short-term bacterial foodborne intoxications such as by Staphylococcus aureus.
 
*Bacillus foodborne illnesses occur due to survival of endospores when food is improperly cooked.  Bacterial growth results in production of enterotoxins, one of which is heat- and acid-stable (pH 2 to 11); ingestion leads to two types of illness: diarrheal and emetic.
 
*Bacillus foodborne illnesses occur due to survival of endospores when food is improperly cooked.  Bacterial growth results in production of enterotoxins, one of which is heat- and acid-stable (pH 2 to 11); ingestion leads to two types of illness: diarrheal and emetic.
*[[8-16 hour incubation time]]
 
  
 
==Clinical Features==
 
==Clinical Features==
 
*Causes severe [[nausea]], [[vomiting]], and [[diarrhea]].<ref> Kotiranta A, Lounatmaa K, Haapasalo M (2000). "Epidemiology and pathogenesis of Bacillus cereus infections". Microbes Infect 2 (2): 189–98. doi:10.1016/S1286-4579(00)00269-0. PMID 10742691.</ref>
 
*Causes severe [[nausea]], [[vomiting]], and [[diarrhea]].<ref> Kotiranta A, Lounatmaa K, Haapasalo M (2000). "Epidemiology and pathogenesis of Bacillus cereus infections". Microbes Infect 2 (2): 189–98. doi:10.1016/S1286-4579(00)00269-0. PMID 10742691.</ref>
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 +
==Differential Diagnosis==
 +
 +
==Management==
  
 
==Prognosis==
 
==Prognosis==
 
Most emetic patients recover within six to 24 hours but in some cases, the toxin can be fatal.<ref> Takabe F, Oya M (1976). "An autopsy case of food poisoning associated with Bacillus cereus". ForensicSci 7 (2): 97–101.</ref>
 
Most emetic patients recover within six to 24 hours but in some cases, the toxin can be fatal.<ref> Takabe F, Oya M (1976). "An autopsy case of food poisoning associated with Bacillus cereus". ForensicSci 7 (2): 97–101.</ref>
 
==[[Antibiotic Sensitivities]]==
 
 
==Table Overview==
 
{{Clinically Relevant Bacteria}}
 
  
 
==See Also==
 
==See Also==

Revision as of 12:49, 4 August 2015

Background

  • Gram-positive, beta-hemolytic, rod-shaped bacterium
  • Known for causing foodborne illness in humans, though some strains are probiotic
  • Classically associated with "fried rice syndrome"
  • 8-16 hour incubation time

Pathogenesis

  • The emetic form is commonly caused by rice cooked for a time and temperature insufficient to kill any spores present, then improperly refrigerated. It can produce a toxin which is not inactivated by later reheating. This form leads to nausea and vomiting one to five hours after consumption. It can be difficult to distinguish from other short-term bacterial foodborne intoxications such as by Staphylococcus aureus.
  • Bacillus foodborne illnesses occur due to survival of endospores when food is improperly cooked. Bacterial growth results in production of enterotoxins, one of which is heat- and acid-stable (pH 2 to 11); ingestion leads to two types of illness: diarrheal and emetic.

Clinical Features

Differential Diagnosis

Management

Prognosis

Most emetic patients recover within six to 24 hours but in some cases, the toxin can be fatal.[2]

See Also

References

  1. Kotiranta A, Lounatmaa K, Haapasalo M (2000). "Epidemiology and pathogenesis of Bacillus cereus infections". Microbes Infect 2 (2): 189–98. doi:10.1016/S1286-4579(00)00269-0. PMID 10742691.
  2. Takabe F, Oya M (1976). "An autopsy case of food poisoning associated with Bacillus cereus". ForensicSci 7 (2): 97–101.