Cytomegalovirus disease

Disease Description (Causes and Symptoms)

• Definition summary: Acute viral hepatitis is a condition in which hepatitis A, B, C, D, and E viruses, hepatitis G virus (e.g., HAV, HBV, HCV, HDV, HEV, etc.), and some viruses such as Epstein–Barr virus (mononucleosis) and cytomegalovirus cause acute inflammation of liver tissue. Generally, it refers to an acute course lasting within 6 months.
• Causes and pathophysiology: The pathophysiology differs depending on the type of causative virus and route of infection. Types A and E are mainly transmitted through contaminated food or water or by the oral route, while types B, C, and D are transmitted through exposure to blood or bodily fluids (such as transfusion, injection, or sexual contact). When the virus invades liver cells and causes inflammation and liver-cell injury, AST/ALT elevation, increased bilirubin, and impaired coagulation may occur.
• Main symptoms: Fatigue, malaise, loss of appetite, nausea and vomiting, low-grade fever, musculoskeletal pain (joint and muscle pain), discomfort/pain in the right upper abdomen, itchy skin, jaundice (yellowing of the whites of the eyes and skin), dark-colored urine, and loss of taste. Most cases are mild and resolve spontaneously, but some may progress to severe hepatitis or acute liver failure.

Treatment Methods and Precautions

• General treatment (in most cases)
  • Supportive care: Adequate rest, fluid and nutritional supplementation (small, frequent meals), symptom relief (control of vomiting and pain), and avoidance of hepatotoxic medications.
  • Medication treatment: Most cases of types A and E and routine mild cases recover with supportive care.
• Specific antiviral treatment
  • Acute hepatitis B (in severe or progressive hepatitis or when there is a risk of acute liver failure): Nucleos(t)ide analogues (such as tenofovir and entecavir) are used. Whether to start antiviral treatment is determined by a specialist based on severity and clinical presentation.
  • Acute hepatitis C: Early antiviral treatment in some cases (DAAs; direct-acting antivirals) may be considered. Consult a specialist.
  • HDV (delta virus): Treatment is combined with HBV treatment; interferon-based therapy may be considered in some cases.
  • HAV and HEV: Prevention (consider immunoglobulin after exposure); treatment is generally supportive care.
• Management of severe disease and complications
  • If acute liver failure is suspected (altered consciousness, elevated INR, severe jaundice, cerebral edema, etc.), immediate hospitalization and evaluation by a liver transplantation team are required.
• Lifestyle management and contraindications
  • Avoid alcohol in all cases.
  • Avoid hepatotoxic medications, herbal medicines, and folk remedies (especially medications of unknown origin). Take only necessary medications after consulting a doctor.
  • Infections with types B, C, and D, which may become chronic, require regular testing even after recovery (for several months to annually).
• Symptoms requiring attention (immediate emergency medical care needed)
  • Decreased consciousness or confusion, inability to drink fluids due to persistent vomiting, a tendency to bleed, rapidly worsening jaundice, a sharp decrease in urine output, etc.

Outpatient Visit Checkpoints (Items to Prepare and Things to Confirm Before Visiting the Hospital)

• Materials and items to bring
  • A list of recently used medications (including prescription medications, OTC medications, herbal medicines, and supplements)
  • Copies of previous test results, if available (liver function tests, blood tests, ultrasound, etc.)
  • Vaccination history (hepatitis A and B)
  • The date symptoms began and their course (when jaundice appeared, changes in urine/stool color, etc.)
  • Recent travel history (exposure to contaminated water or food), history of transfusions or injections/procedures, sexual-contact history, and whether injectable drugs are used
  • Records of alcohol use, smoking, and weight changes
• Items useful to record during outpatient visits
  • Fever, changes in appetite, digestive symptoms, urine/stool color, location and intensity of abdominal pain, and degree of fatigue (decline in daily functioning)
  • Whether there have been contacts (family members with similar symptoms or confirmed hepatitis)

Examples of General Questions to Ask the Doctor

• "What do my liver function test results mean (ALT/AST, bilirubin, INR, etc.)?"
• "What tests (viral serology, PCR, etc.) are needed? When will the results be available?"
• "How likely is this infection to become chronic? How should follow-up testing be done?"
• "Are there any medications or supplements I am taking that I should stop?"
• "When is it safe to resume daily activities, return to work, and restart exercise?"

Examples of Disease-Specific Questions

• (When type B is suspected) "In my case, should I start an antiviral medication (e.g., tenofovir or entecavir)? What are the criteria for starting it?"
• (When there has been recent overseas travel or exposure to contaminated food) "Could I have a type A or type E infection? When should preventive immunoglobulin or vaccination be given after exposure?"

Additional Recommendations

• Prevention: Vaccination against hepatitis A and B, consumption of safe food and water, prevention of exposure to needles and blood, safe sex (condoms), and no sharing of syringes. Caution is needed because HEV infection during pregnancy carries an increased risk of severe disease.
• Follow-up testing: Even after recovery from acute hepatitis, serologic follow-up for at least 3–6 months is recommended depending on the viral type (especially for HBV/HCV/HDV).

(Summarized based on the clinical information provided. Specific testing and treatment decisions should follow the clinical judgment of the treating specialist.)