They have to confirm with a blood test firt then there are antiviral drugs that the infected person can take. My brother in law also ingested some contaminated food while he was in Asia and he got hospitalized after running a very high fever and turning yellow :(
"There are no specific medicines to cure infection with hepatitis A. Most people require no treatment except to relieve symptoms.
If you have been exposed to someone who is infected with HAV, there is a treatment that may prevent you from becoming infected. It is called immune globulin and is more likely to be effective when given within 2 weeks of exposure."