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Why Do We Feel Sick When Infected--Can Altruism Play a Role?

Shakhar K, Shakhar G - PLoS Biol. (2015)

Bottom Line: Nonetheless, SB seems evolutionarily costly: it promotes starvation and predation and reduces reproductive opportunities.Former explanations focused on individual fitness, invoking improved resistance to pathogens.Could prevention of disease transmission, propagating in populations through kin selection, also contribute to SB?

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, College of Management Academic Studies, Rishon LeZion, Israel.

ABSTRACT
When we contract an infection, we typically feel sick and behave accordingly. Symptoms of sickness behavior (SB) include anorexia, hypersomnia, depression, and reduced social interactions. SB affects species spanning from arthropods to vertebrates, is triggered nonspecifically by viruses, bacteria, and parasites, and is orchestrated by a complex network of cytokines and neuroendocrine pathways; clearly, it has been naturally selected. Nonetheless, SB seems evolutionarily costly: it promotes starvation and predation and reduces reproductive opportunities. How could SB persist? Former explanations focused on individual fitness, invoking improved resistance to pathogens. Could prevention of disease transmission, propagating in populations through kin selection, also contribute to SB?

No MeSH data available.


Related in: MedlinePlus

The benefits of SB to indirect fitness.Symptoms of SB (pink) can suppress (red connectors) or promote (green arrows) several mediating behaviors (yellow), consequently reducing pathogen transmission through several routes (blue).
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pbio.1002276.g003: The benefits of SB to indirect fitness.Symptoms of SB (pink) can suppress (red connectors) or promote (green arrows) several mediating behaviors (yellow), consequently reducing pathogen transmission through several routes (blue).

Mentions: Strikingly, most of the symptoms that constitute SB share a common denominator: they restrict contacts between sick individuals and their social groups (Fig 3). Symptoms of sickness achieve this feat using three containment strategies:


Why Do We Feel Sick When Infected--Can Altruism Play a Role?

Shakhar K, Shakhar G - PLoS Biol. (2015)

The benefits of SB to indirect fitness.Symptoms of SB (pink) can suppress (red connectors) or promote (green arrows) several mediating behaviors (yellow), consequently reducing pathogen transmission through several routes (blue).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608734&req=5

pbio.1002276.g003: The benefits of SB to indirect fitness.Symptoms of SB (pink) can suppress (red connectors) or promote (green arrows) several mediating behaviors (yellow), consequently reducing pathogen transmission through several routes (blue).
Mentions: Strikingly, most of the symptoms that constitute SB share a common denominator: they restrict contacts between sick individuals and their social groups (Fig 3). Symptoms of sickness achieve this feat using three containment strategies:

Bottom Line: Nonetheless, SB seems evolutionarily costly: it promotes starvation and predation and reduces reproductive opportunities.Former explanations focused on individual fitness, invoking improved resistance to pathogens.Could prevention of disease transmission, propagating in populations through kin selection, also contribute to SB?

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, College of Management Academic Studies, Rishon LeZion, Israel.

ABSTRACT
When we contract an infection, we typically feel sick and behave accordingly. Symptoms of sickness behavior (SB) include anorexia, hypersomnia, depression, and reduced social interactions. SB affects species spanning from arthropods to vertebrates, is triggered nonspecifically by viruses, bacteria, and parasites, and is orchestrated by a complex network of cytokines and neuroendocrine pathways; clearly, it has been naturally selected. Nonetheless, SB seems evolutionarily costly: it promotes starvation and predation and reduces reproductive opportunities. How could SB persist? Former explanations focused on individual fitness, invoking improved resistance to pathogens. Could prevention of disease transmission, propagating in populations through kin selection, also contribute to SB?

No MeSH data available.


Related in: MedlinePlus