The evaluation rat bite fever includes a history of a rat bite and a physical examination.

Physical findings in someone with rat bite fever may include:

• Skin wound:
• Rat bite
• Rash:
• Looks like broken blood vessels under the skin
• Fever
• Joint swelling (multiple joints)

Tests that may be used to evaluate rat bite fever include:

• Blood culture
• Wound culture
• Serum antibody levels