Do hamsters carry diseases that are harmful to humans?

Rare, but possible: Any household pet can potentially pass along a disease to humans (zoonoses). However, hamsters are usually relatively benign in this regard; the biggest concern from hamsters regards bites and allergies to their dander. Guinea pigs are known to be carriers of the causative agent of salmonella sometimes. It is always a good idea to wash one's hands after handling a pet (including dogs).

Rare but can happen.: Hamsters can directly or indirectly transmit Rabies, Tularemia, Salmonellosis, Lymphocytic choriomeningitis virus, Dermatophytosis (ringworm, dermatomycosis), Rodentolepiasis and Hymenolepiasis (tapeworms).