Cardiac outflow obstruction may also result in sudden-onset syncope with little or no prodrome. One critical clue is the exertional nature, and the other is the presence of a cardiac murmur. Young athletes may present with this etiology for syncope.
SUMMARY. Summary: Flagellar and translocation-associated type III secretion (T3S) systems are present in most Gram-negative plant-and animal-pathogenic bacteria and are often essential for bacterial motility or pathogenicity.o date, T3S4 proteins have been described for translocation-associated T3S systems from several animal-pathogenic bacteria (YscP from Yersinia spp., Spa32 from Shigella spp., and InvJ from Salmonella spp.) and the plant-pathogenic bacterium X. campestris pv. vesicatoria (HpaC) (Table 6).
Intracellular Pathogens. The immune system is vastly more complex than portrayed in this brief glimpse. Another important facet which is worth mentioning is the problem of intracellular pathogens.Intracelluar pathogens are organisms such as viruses and certain bacteria which live inside host cells.f a killer T-cell is activated by recognition of a MHC/protein combination, it will kill the infected host cell. There are many ways in which this is done, e.g. killer T-cells can punch holes in cell walls, or secrete chemicals that destroy cell walls, etc. NEXT: Summary. An Overview of the Immune System.