Tests to eliminate underlying viral causes include virus testing for [[Feline Immunodeficiency Virus (FIV)|FIV]], [[Feline Leukemia Virus (FeLV)|FeLV]] and an oral Swab for [[Feline Calicivirus|FCV]]. | Tests to eliminate underlying viral causes include virus testing for [[Feline Immunodeficiency Virus (FIV)|FIV]], [[Feline Leukemia Virus (FeLV)|FeLV]] and an oral Swab for [[Feline Calicivirus|FCV]]. |