Journal of Comparative Physiology B

, Volume 183, Issue 3, pp 297–312 | Cite as

A review of the physiology of fever in birds

  • David A. Gray
  • Manette Marais
  • Shane K. Maloney
Review

Abstract

While fever is known to occur in invertebrates and vertebrates, the mechanisms of fever in animals other than mammals have received scant attention. We look initially at the recognition, by the avian immune system, of pathogen associated molecular patterns and the likely role of toll-like receptors in signaling the presence of bacteria and viruses. Several mediators of fever are subsequently released by immune cells, including interleukin-6 and interleukin-1β, that eventually reach the brain and alter thermoregulatory function. As is the case in mammals, prostaglandins appear to be the ultimate mediators of fever in birds, since the febrile response is attenuated when prostaglandin synthesis is inhibited. Ambient temperature modulates the fever response, with larger fevers at higher, and smaller fevers at lower ambient temperatures. Glucocorticoid levels are increased during fever and seem to play an important role by modulating the extent of fever generation, possibly playing a role in the attenuation of fever after repeated exposure to a pathogen in a process termed tolerance, suggesting that the fever process can be phenotypically adapted to likely future conditions. While fever has an ancient phylogenetic history and many of the underling mechanisms in birds appear similar to mammals, there are several important differences that suggest fever has evolved quite differently in these two homeothermic classes.

Keywords

Febrile response in birds Acute phase response Thermal biology 

Abbreviations

LPS

Lipopolysaccharide

PAMP

Pathogen-associated molecular pattern

MDP

Muramyl dipeptide

TLR

Toll-like receptor

EE

Energy expenditure

PG

Prostaglandin

NO

Nitric oxide

AA

Arachidonic acid

COX

Cyclo-oxygenase

l-NAME

l-Nitro-arginine methyl ester

IL

Interleukin

TRI

Thermal response index

AVT

Arginine vasotocin

TNZ

Thermoneutral zone

TNF

Tumour necrosis factor

HPA

Hypothalamic–pituitary–adrenal

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • David A. Gray
    • 1
  • Manette Marais
    • 1
  • Shane K. Maloney
    • 1
    • 2
  1. 1.School of Physiology, Faculty of Health SciencesUniversity of the WitwatersrandJohannesburgSouth Africa
  2. 2.School of Anatomy, Physiology and Human BiologyUniversity of Western AustraliaPerthAustralia

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