Etiology and properties of the pathogen
The disease is caused by an RNA-containing virus classified as a member of the family Caliciviridae (genus Calicivirus). This microorganism possesses specific environmental survival characteristics:
- It demonstrates high resistance to low temperatures, surviving exceptionally well when frozen to –20 °C and below.
- The virus is extremely sensitive to temperature fluctuations: "freeze-thaw" cycles rapidly lead to its inactivation.
- The pathogen is easily destroyed upon contact with standard chlorine- and iodine-based disinfectants.
Epidemiology
The sole source of infection is an infected human. The transmission mechanism is fecal-oral.
The waterborne route is absolute dominant among the routes of spread. This is associated with insufficient or inadequate chlorination of tap water, as well as drinking water directly from open reservoirs. Alimentary (foodborne) and contact-transmission routes are less common.
The epidemic process is characterized by a tendency toward mass spread, frequently causing large outbreaks. Notably, the primary target of the virus is not children, but adults in the 15 to 30 age group.
Pathogenesis features
The exact mechanisms by which the virus damages human hepatocytes (liver cells) remain under investigation. The primary data were obtained through experimental modeling in primates:
- By the end of the first month following infection, a typical morphological picture of acute hepatitis forms in the liver tissues.
- A cytolytic syndrome develops, the primary marker of which is an elevation of transaminase levels in the blood.
- Simultaneously with increasing liver damage, active shedding of viral particles in the feces begins.
- Seroconversion—the process of production and appearance of specific antibodies in blood serum—is recorded 8–15 days after the onset of viral shedding in stool.
Clinical presentation
The incubation period of the infection can last from 10 to 50 days. Following this, the disease passes through two main stages:
Preicteric period At this time, asthenovegetative and dyspeptic disorders come to the forefront. Patients complain of pronounced generalized weakness, anorexia, nausea, episodes of recurrent vomiting, and abdominal pain. On days 3–4 from the onset of the disease, fever typically joins these symptoms.
Icteric period Jaundice manifests in virtually 100% of infected individuals and progressively increases over 2–3 days. Key clinical feature of the infection: unlike some other forms of hepatitis, the intoxication syndrome does not resolve with the appearance of skin jaundice and continues to trouble the patient.
Objectively, the physician detects hepatomegaly (enlargement of the liver). This period lasts from 2 to 3 weeks. Laboratory tests during this time register pronounced hyperbilirubinemia: the concentration of total bilirubin may exceed normal values by 2 to 10 times.
To remember the main clinical feature, use the phrase: "In hepatitis E, jaundice is E-xistent, but you don't f-E-el any better" (intoxication does not disappear with the onset of jaundice).
Class and exam questions
Who is the main source of infection in hepatitis E?
The sole source of infection is an infected human.
What are mass disease outbreaks most commonly associated with?
Epidemic outbreaks are closely linked to poor sanitation, primarily inadequate water chlorination and drinking from open water bodies.
What is the main feature of the icteric period?
The key feature is that after the appearance of jaundice, the intoxication syndrome persists and does not resolve.
What else to study on this topic
- Morphological picture of acute hepatitis: changes in hepatocytes
- Dynamics of transaminase levels in cytolytic syndrome
- Structure of the Caliciviridae virion
- Laboratory diagnostic methods and antibody detection
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