まとめ
胃酸の低さ (ヒポクロヒドリア) はコレラによるものではないが,重症になる可能性が高い. この状態は,開発途上国における酸感受性の病原体による下痢の高い割合を説明する可能性がある.
科学分野:
- 胃腸内科 胃腸内科
- 感染症 感染症は感染症です.
- エピデミオロジー エピデミオロジー
背景:
- コレラは,特に発展途上国において,公衆衛生上の重大な問題である.
- 胃酸の減少 (低塩素水症) は,コレラ患者で観察されていますが,その因果関係は不明でした.
研究 の 目的:
- コレラがヒポクロヒドリアを引き起こすか,またはヒポクロヒドリアが重症のコレラに誘発する要因であるかどうかを調査する.
- 酸に敏感な病原体によって引き起こされる下痢疾患の発生におけるヒポクロヒドリアの役割を調査する.
主な方法:
- コレラから回復しているバンガリー人の患者で,断食と食後の胃酸の産生を測定した.
- アメリカ人のボランティアで,コレラ感染前と後の基礎およびベタゾール塩化水素刺激による酸の産生を評価した.
主要な成果:
- 37人のBangalee患者のうち16人が,コレラ後の胃酸の低生産を示した.
- 低塩化水素患者からの胃酸は,in vitroでコレラビブリオを殺すことができなかった.
- コレラはアメリカのボランティアで胃酸の分泌を変化させなかった.
- コレラ前における低酸の産生は,コレラの重症度の上昇と相関していた.
結論:
- バンガリー・コレラ患者におけるヒポクロヒドリアは,感染に先行し,感染によって引き起こされるものではありません.
- Idiopathic tropical hypochlorhydriaは,開発途上国における下痢疾患の重要なリスク因子である可能性があります.
- 酸に敏感な病原体と宿主因子を理解することは,公衆衛生の介入にとって極めて重要です.
関連する概念動画
Stomach pH Regulation
The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...
Acids, Bases and Neutralization Reactions
Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
Microbiota of the Stomach and Small Intestine
The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
Reservoir of Infection
Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
Bacterial Gastroenteritis
Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Cholera
Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...


