5.18
바이러스성 간염 I: 소개
바이러스성 간염은 간친화성 바이러스 감염으로 인해 발생하는 간의 염증성 질환으로, 가장 흔한 원인은 A형, B형, C형, D형 및 E형 간염 바이러스입니다. 구조와 전파 방식에는 차이가 있지만, 언급된 모든 바이러스는 간세포를 감염시키고 간 기능을 저해할 수 있는 면역…
바이러스성 간염은 간 조직을 표적으로 하는 바이러스 감염으로 인한 간 염증입니다. 가장 흔한 원인은 간염 계열인 A-E 바이러스입니다.
A형 간염 바이러스는 오염된 음식이나 물을 통해 대변-구강 경로를 통해 전파됩니다.
B형 간염은 감염된 혈액과 체액을 통해 전파되는 DNA 바이러스입니다. 일반적인 경로로는 성적 접촉, 직업적 노출, 특히 바늘 찔림 부상, 산모에서 아기로 전염되는 산전 전파가 있습니다.
C형 간염은 주로 혈액 노출을 통해 전파되는 RNA 바이러스입니다. 일반적인 경로로는 약물 주사 바늘 공유와 안전하지 않은 문신 행위가 포함됩니다.
D형 간염 바이러스는 감염을 위해 HBV가 필요한 결함 있는 RNA 바이러스입니다. 이는 HBV와 HDV가 함께 간세포에 들어올 때 동반감염으로 발생할 수도 있고, 이미 HBV를 보유한 사람이 HDV를 감염시킬 때 중증감염으로 발생할 수도 있습니다.
E형 간염 바이러스는 대변-구강 경로를 통해 전파되는 RNA 바이러스로, 일반적으로 오염된 물을 통해 전파됩니다.
또한, 엡스타인-바 바이러스, 거대세포바이러스, 황열병 바이러스 등 다른 바이러스들도 간염을 유발할 수 있습니다.
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Q1: How does hepatitis A virus spread from person to person?
Hepatitis A virus spreads through the fecal-oral route, typically when a person ingests food or water contaminated with fecal material from an infected individual. After entering the gastrointestinal tract, the virus reaches the liver and infects hepatocytes, causing an acute, self-limiting illness that resolves without chronic infection.
Q2: What are the main transmission routes for hepatitis B virus?
Hepatitis B virus spreads through infected blood and body fluids via sexual contact, sharing needles, occupational exposures such as needlestick injuries, and vertical transmission from mother to infant during childbirth. HBV infection may be acute or progress to chronic disease, making transmission prevention critical in healthcare settings.
Q3: Why is hepatitis D virus dependent on hepatitis B virus?
Hepatitis D virus is a defective RNA virus that requires hepatitis B virus for replication and cannot infect hepatocytes independently. HDV infection occurs as coinfection when HBV and HDV enter hepatocytes simultaneously, or as superinfection in individuals already chronically infected with HBV, typically worsening disease severity.
Q4: How does hepatitis C virus primarily transmit between individuals?
Hepatitis C virus is an RNA virus transmitted primarily through blood exposure, including sharing drug-injection equipment and unsafe tattooing or piercing practices. Sexual contact involving blood exposure is a less common transmission route. HCV infection can lead to chronic hepatitis and requires careful prevention strategies.
Q5: What distinguishes hepatitis E virus transmission and clinical course?
Hepatitis E virus is an RNA virus spread via the fecal-oral route, most commonly through contaminated water. While HEV generally causes acute hepatitis, infection can be especially severe in pregnant individuals, particularly during the third trimester, distinguishing it from other hepatitis viruses in terms of pregnancy-related complications.
Q6: Can viruses other than hepatitis A-E cause liver inflammation?
Yes, additional viruses such as Epstein-Barr virus, cytomegalovirus, and yellow fever virus can cause hepatitis as part of systemic infections. These non-hepatotropic viruses infect hepatocytes and provoke immune responses that can hinder liver function, though they are less common causes of viral hepatitis than the hepatitis family viruses.
Q7: What is the fundamental mechanism by which viral hepatitis damages the liver?
Viral hepatitis causes liver inflammation when hepatotropic viruses infect hepatocytes and provoke immune responses that can hinder liver function. Despite variations in viral structure and transmission routes, all hepatitis viruses target hepatic tissue, resulting in inflammation that ranges from acute, self-limiting illness to chronic disease with potential complications.