Typhoid Mary in a 1909 newspaper illustration. Mary Mallon was an<unk>  of Salmonella typhi who is thought to have infected 53 others with typhoid fever while continuing her work as a cook. An<unk>  is a person or other organism that has become infected with a pathogen, but that displays no signs or symptoms. Although unaffected by the pathogen,<unk> s can transmit it to others or develop symptoms in later stages of the disease.<unk> s play a critical role in the transmission of common infectious diseases such as typhoid, HIV, C. difficile, influenzas, cholera, tuberculosis and COVID-19, although the last is often associated with "robust T-cell immunity" in more than a quarter of patients studied. While the mechanism of disease-carrying is still unknown, researchers have made progress towards understanding how certain pathogens can remain dormant in a human for a period of time. A better understanding of<unk>  disease<unk> s is crucial to the fields of medicine and public health as they work towards mitigating the spread of common infectious diseases.
Asymptomatic carrier
Serodiscordant
Susceptible individual
Vulnerable adult
At risk mental state
Rape during the Kashmir conflict
Dual diagnosis
Late talker