Ringworm in Guinea Pigs
Ringworm is not actually caused by a worm but is a skin infection caused by a fungus. While lesions alone can lead to high suspicion of an infection, definitive diagnosis is made by culturing the fungus or by PCR testing. Because the culture test can take 2-3 weeks to complete, treatment is typically started immediately in suspect cases. The PCR test is more commonly used and results generally take 3 days. If the test is positive, treatment should continue and cultures or PCR testing should be repeated every 3 weeks until two consecutive negative results are obtained for the fungus.