What should you know about the CDC hepatitis A vaccine?

Hepatitis A is a viral infection of the liver. It can cause feeling generally unwell, nausea, loss of appetite, abdominal discomfort, dark urine, and yellowing of the skin or eyes. Some people have few symptoms, while others feel significantly ill. Vaccination prepares the immune system to recognise the virus and lowers the chance of illness when protection is established.

The vaccine is preventive; it does not treat an established infection. Protection planning may be relevant before travel, after a possible exposure, or for people whose work, health, or living circumstances increase risk. A clinician can decide whether vaccination is appropriate and whether another action is needed after exposure.

Arrange an appointment early if you are travelling or have had a possible exposure. Tell the clinician about previous hepatitis A vaccination, allergies, pregnancy, immune problems, liver disease, and current medicines. Keep your vaccination record so the schedule can be checked rather than repeated unnecessarily.

Hepatitis A vaccination is given according to a recommended schedule, with the timing depending on the product and your situation. Mild soreness or tiredness can occur after an injection. Follow the clinic’s advice about the next dose and continue careful hand hygiene and food safety, because vaccination does not replace these measures.

Seek medical advice promptly after a possible exposure, especially if you develop nausea, marked tiredness, loss of appetite, abdominal pain, dark urine, or yellow skin or eyes. A liver function test may be considered alongside other assessment. Seek urgent care for severe vomiting, confusion, dehydration, or rapidly worsening illness. Tell the clinician about travel, food or water exposure, and close contacts.

Ask whether you need hepatitis A vaccination, when each dose should be given, and what to do after a missed appointment or recent exposure. Check whether your liver history, immune status, pregnancy, or medicines change the plan, and ask which symptoms should trigger testing.