Toxoplasma gondii is a pathogenic agent responsible for causing both systemic and local disease which elicits a typically pro-inflammatory, Th1 immune response.
Thus, whether parvovirus B19 is a pathogenic agent of fulminant liver failure and non A-E hepatitis, a risk factor accelerating liver dysfunction due to other agents, or alternatively a bystander with no influence on liver pathology, is still unresolved.
Rickettsia parkeri was detected in A. triste, which suggests that this species could be considered a pathogenic agent responsible for human rickettsioses in Uruguay.
It may therefore be that a pathogenic agent enters the body and gains access to the gastrointestinal tract, invades vulnerable neurons in the ENS and is subsequently retrogradely transported to the CNS through vagal preganglionic fibers.
These findings suggest WUPyV may be a potential pathogenic agent in children with acute respiratory tract infections.
Results are presented in Table 2. Maternal fever at delivery was more commonly seen in infants in whom a pathogenic agent was not detected.
Piscirickettsia salmonis, the causative agent of SRS, was first identified as a pathogenic agent in disease outbreaks among farmed Chilean Coho salmon (Oncorhynchus kisutch) in 1989, and since then, infectivity has been demonstrated in all cultured salmonid species, from the south of Chile to the Northern Hemisphere [ 5– 7].
Lymphoid cells were then exposed to a pathogenic agent under conditions (dose, exposure time) deemed optimal for biological activity for each agent by the pathogen specialist.
Presuming a pathogenic agent is present in the sample, the undetected disease agents in these cases may simply be known species that are not targeted by a laboratory's testing algorithm or they may be truly novel pathogens.
After testing for all known enteropathogens, a pathogenic agent was detected in 66% of the diarrhoea cases.
