Many cats will remain silent carriers their whole lives. (thesprucepets.com)
But some of those animals go on to become silent carriers that spread the disease to others. (2ndchance.info)
In 1 in 10 cases, people infected with these germs spread the disease to apparently healthy people in the hospital — such as patients, doctors or nurses — who in turn can act as silent carriers of illness, infecting others even if they don't become sick. (scientificamerican.com)