The POA, previously known as the "thermoregulatory center," contains warm-sensitive neurons that control all autonomic thermoeffectors [3] and that are thought to be the first neurons in the efferent fever pathway [13] [16].
The second fever pathway, also initiated in the hypothalamus by afferent signals from the vagus nerve, is mediated by locally produced macrophage inflammatory protein-1 (MIP-1), a chemokine.
There are two related fever pathways.
Important patient-related risk factors for severity and fatality include age, concomitant diseases, and concurrent medications, as well as other less well-defined factors, such as defects in mediator degradation pathways, fever, acute infection, menses, emotional stress, and disruption of routine.
Hyperthermia and fever follow different pathways, so studies on hyperthermia cannot be directly translated into the fever setting.
Thus, the present study was designed to test the hypothesis that the HO CO pathway mediates fever by acting on the preoptic region of the anterior hypothalamus (POA), which is the brain body core temperature (Tc) controller site.
Induction of fever involves a multiple-pathway mechanism in which circulating cytokines, particularly proinflammatory cytokines including TNF, IL-1, IL-6, and INF, are the major mediators of fever [ 9].
In summary, the present results support the idea that the POA is not the brain site where the HO CO pathway acts as a fever mediator.
Requirement for elevated body temperature at enrollment could potentially exclude elderly patients, diabetics, and the immunocompromised, leading some authors to question whether fever is even on the causal pathway of the disease [18].
African swine fever has a complex epidemiology with multiple pathways for introduction and spread [ 1].
By inhibiting the production of PGs, these drugs suppress the pathways that mediate inflammation, pain and fever.
