A likely pathogen may be Hepatitis C.
Explanation:
Hepatitis C is the infection causing virus leading to liver attack and inflammation. Hepatitis C virus is usually spread by contact with contaminated blood. This may happen while sharing needles or from unsterile tattoo equipment. The virus is commonly transmitted by saliva or semen of an infected person.
This virus causes fatigue, nausea, yellowing of the eyes and skin and loss of appetite. The person infected with Hepatitis C can be cured with antiviral medications.