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Most of our current knowledge about the molecular determinants of bacterial pathogenicity comes from studies with cultures in vitro. However, interest is increasing in bacterial behaviour in the complex and ever-changing environment of the infected host. New methods are revealing how bacteria behave in their hosts, providing many surprises and indicating how much of the subject remains unexplored.
Standard virulence evolution theory assumes that virulence factors are maintained because they aid parasitic exploitation, increasing growth within and/or transmission between hosts. An increasing number of studies now demonstrate that many opportunistic pathogens (OPs) do not conform to these assumptions, with virulence factors maintained instead because of advantages in non-parasitic contexts. Here...
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