Typhoid Mary, pictured above in a 1909 tabloid, was a famous case of a<unk>  of Salmonella enterica serovar. A<unk>  — sometimes called a preinfection or inapparent infection — is an infection that, being<unk> , is nearly or completely asymptomatic (no signs or symptoms). A<unk> ly infected person is thus a paucisymptomatic or asymptomatic carrier of a microbe, intestinal parasite, or virus that usually is a pathogen causing illness, at least in some individuals. Many pathogens spread by being silently carried in this way by some of their host population. Such infections occur both in humans and animals. An example of an asymptomatic infection is a mild common cold that is not noticed by the infected individual. Since<unk> s often occur without eventual overt sign, their existence is only identified by microbiological culture or DNA techniques such as polymerase chain reaction.
Subclinical infection
Breakthrough infection
Spillover infection
Passive immunity
Criminal transmission of HIV
Asymptomatic carrier
Virus latency
Vaccine-induced seropositivity