Rat bite fever symptoms: what to know

Rat bite fever is caused by bacteria associated with rodents. Symptoms can begin after a bite, scratch, or contact with contaminated material, and the original wound may look minor or have healed. Fever may come with chills, tiredness, headache, or body aches. Joint pain can affect one or several joints, while the rash may appear on the hands and feet or spread more widely. These features overlap with other infections, so symptoms alone do not confirm the diagnosis.

Clean any bite or scratch promptly with soap and running water. Record the exposure details and check your temperature if you feel unwell. Contact a healthcare professional promptly if fever, rash, vomiting, or joint pain develops after rodent exposure. Tell them about the timing, the animal involved, broken skin, and any medicines or health conditions that may affect treatment. Prescription antibiotics may be needed when the clinical assessment supports infection.

Get urgent help for confusion, fainting, breathing difficulty, severe dehydration, repeated vomiting, rapidly worsening weakness, a spreading rash, or a hot and severely painful joint. Seek same-day medical advice for fever after a rat bite or scratch, even if the skin wound appears small. Early assessment helps distinguish rat bite fever from cellulitis and other causes of fever or rash.

Ask which symptoms are most concerning, whether you need blood or wound testing, how soon treatment should start, and what changes should prompt a return visit.