Asymptomatic or subclinical infection carriers are now known to be a common feature of many infectious diseases, especially viruses such as polio, herpes simplex, HIV, and hepatitis C. As a specific example, all doctors and virologists agree that poliovirus causes paralysis in just a few infected subjects, and the success of the polio vaccine in preventing disease supports the conviction that the poliovirus is the causative agent.
Asimptomatski ili supkliničkoinfektivni kliconoše danas su poznati kao uobičajeno obilježje mnogih infektivnih bolesti, navlastito virusa kao što je polio, herpes simpleks, HIV i hepatitis C. Kao poseban slučaj, svi se doktori i virolozi naime slažu da poliovirus uzrokuje paralizu samo u nekih inficiranih subjekata, i uspjeh cjepiva protiv polija u prevenciji bolesti podupiru uvjerenje da je poliovirus uzročni agens.