There is a spectrum of pathogenic potential among pathogenic bacteria – from those that are opportunistic pathogens, only capable of virulent behaviour in the presence of local or systemic defects of host defences, through to pathogens, which might be termed professional, capable of pathogenic behaviour in the presence of normally functioning host defences.
tabacum interactions, and to assess whether A. tumefaciens has a direct or plant-mediated effect on pathogen growth, behaviour and expression of pathogenicity factors.
Although it had been present at low levels in the UK for a number of years, in 2009 there was a sudden change in the pathogen's behaviour.
Recent studies also indicate that there is a neural regulation of innate immunity as well as pathogen avoidance behaviour.
In comparison, vector biologists are more interested in particular phenotypes related to disease transmission such as pathogen interaction, behaviour and insecticide resistance, where it is desirable to capture natural variation.
It is also likely that evolved differences in gene expression, or regulatory evolution, has played a pivotal role in generating phenotypic diversity involved in pathogen-like behaviour of AIEC, as we have shown previously for another intracellular pathogen [ 62, 63].
The lowered activity of the immune system is compensated for by pathogen avoidance behaviours, and it is within this framework that the nausea and vomiting of pregnant woman are currently interpreted.
This importance is enhanced by its abundance in Europe, the high levels of infection observed in this species, its ability to disseminatethe pathogen, its scavenging behaviour and, mostly, its potential ability for crossing fences and contacting with livestock [ 22].
Pre-travel advice regarding TD included an explanation of TD etiology, mode of pathogen transmission, preventive behaviour, treatment options and, if indicated, written instructions on how to use antibiotics.
Understanding the impact of intracellular pathogens on the behaviour of their host cells is key to designing new interventions.
