Which animal is noted for being a carrier of lymphocytic choriomeningitis without showing signs of illness?

Mice are known to be carriers of lymphocytic choriomeningitis (LCMV) and can host the virus without exhibiting any clinical signs of illness. This characteristic is particularly vital in laboratory settings as it can lead to unintentional transmission of the virus to other animals or even humans who come into contact with infected mice or their environments. Because of their asymptomatic nature in carrying LCMV, it is critical for researchers and animal care personnel to handle mice with caution and implement strict biosecurity measures to prevent the spread of this zoonotic disease.

In comparison, rats, hamsters, and guinea pigs do not typically serve as carriers of LCMV in the same manner. Although these animals can carry various other pathogens, they usually show signs of illness when infected with agents that would be harmful to them, which prevents them from being classified as silent carriers of LCMV like mice.