The interplay between a direct viral pathologic process and a host immune-mediated pathologic process is probably unique to each person.
Often immune responses result in a pathologic condition for the host in addition to parasite clearance, and Wolbachia may exacerbate these responses (12).
However, vaccine development for C. trachomatis remains challenging partly due to the potential pathologic effects of the host's immune response to Chlamydia [ 35].
Therefore, in conjunction with the diversity of the ERV U3 promoter sequences, these findings infer active participation of ERVs in a range of normal physiologic as well as pathologic events of the host [ 7, 8].
Hence, in applying these findings to altered forms created in vivo (humans) these may take up intracellular and/or extracellular residence; possibly establishing a sort of immune protected parasitic relationship persisting/surviving phagocytic action, and creating subtle pathologic changes in the host during a prolonged period of tissue persistence.
Taken together these results suggest that the magnitude of the host immune-pathologic response to Mtb W4 infection was dose dependent.
Because incubation periods and altered PrPres deposition in the brain have been linked to polymorphisms in the PrP amino acid sequence (8, 35 ), we investigated the possibility that PrPres biochemical and pathologic changes correlate with different host PrP amino acid sequences.
In this paper we show that the development of Chagas disease is a consequence of a long-term and complex relationship between parasite persistence and maladapted homeostatic mechanisms in the host which leads to pathologic changes.
In pathologic sites such as granulomas, where infiltrating host cells outstrip a meager microvasculature, hypoxia is presumed to increase host cell glycolysis, and the limited perfusion that contributes to hypoxia is expected to allow acid products of glycolysis to accumulate.
The neurotropic RNA and DNA viruses that produce central nervous system (CNS) diseases employ a range of pathologic mechanisms in a variety of hosts.
A recent article reviewed clinical, experimental, and pathologic studies for the notion of a host immune response including cell-mediated immunity in M. pneumonia infections [ 8].
