The paper attributed confusion over pathogenicity to the existence of asymptomatic carriers, a phenomenon the study noted is common to all gastrointestinal protozoa.
12.
It is not clear whether the rats are affected by " P . marneffei " or are merely asymptomatic carriers of the disease.
13.
However, Koch abandoned the universalist requirement of the first postulate altogether when he discovered asymptomatic carriers of cholera and, later, of typhoid fever.
14.
Scientists calculate that between 1 % and 6 % of individuals infected with " Salmonella " " typhi " become chronic, asymptomatic carriers like Mary.
15.
Those infected may become asymptomatic carriers, but it is relatively uncommon, with shedding observed in only 0.2 to 0.6 % of cases after a year.
16.
Meningitis occurs sporadically throughout the year, and since the organism has no known reservoir outside of man, asymptomatic carriers are usually the source of transmission.
17.
So far they are unsuccessful, as the experimental serums they are testing on patients ( who are actually asymptomatic carriers of the virus ) shows no effect.
18.
Although 72 % of the population are Duffy antigen negative, 8.8 % of the Duffy antigen negative individuals were asymptomatic carriers of " P . vivax ".
19.
In August 2013, researchers at the Stanford University School of Medicine announced they were making breakthroughs in understanding the exact science behind asymptomatic carriers such as Mallon.
20.
This species is a major cause of family and institutional outbreaks because of its persistent nature in indoor environments, and its ability to be transmitted through asymptomatic carriers.
