Aloha! You're speaking with Dr. Michael SalkinYou're correct. Hamsters carry tapeworms more so than the other common rodents kept as pets and some of the tapeworms can infect humans. Tapeworms are contracted when the hamster comes in contact with contaminated water and/or feed. A solitary hamster is unlikely to be exposed because other (infected) hamsters aren't contaminating the water and/or feed but it's certainly possible that she was exposed prior to your bringing her home.Nevertheless, because infected hamsters are most often asymptomatic, we would need to collect a few grams of her feces and perform a microscopic ova and parasite exam looking for the characteristic tapeworm eggs. If found, treatment is highly effective; I inject or dose orally praziquantel at a dose of 6-10mg/kg and repeat the dosing in 10 days. Please respond with further questions or concerns if you wish.