Poor condition and infection: a vicious circle in natural populations

Pablo M. Beldomenico, Sandra Elizabeth Telfer, Stephanie Gebert, Lukasz Lukomski, Malcolm Bennett, Michael Begon

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)


Pathogens may be important for host population dynamics, as they can be a proximate cause of morbidity and mortality. Infection dynamics, in turn, may be dependent on the underlying condition of hosts. There is a clear potential for synergy between infection and condition: poor condition predisposes to host infections, which further reduce condition and so on. To provide empirical data that support this notion, we measured haematological indicators of infection (neutrophils and monocytes) and condition (red blood cells (RBCs) and lymphocytes) in field voles from three populations sampled monthly for 2 years. Mixed-effect models were developed to evaluate two hypotheses, (i) that individuals with low lymphocyte and/or RBC levels are more prone to show elevated haematological indicators of infection when re-sampled four weeks later, and (ii) that a decline in indicators of condition is likely to follow the development of monocytosis or neutrophilia. We found that individuals with low RBC and lymphocyte counts had increased probabilities of developing monocytosis and higher increments in neutrophils, and that high indices of infection (neutrophilia and monocytosis) were generally followed by a declining tendency in the indicators of condition (RBCs and lymphocytes). The vicious circle that these results describe suggests that while pathogens overall may be more important in wildlife dynamics than has previously been appreciated, specific pathogens are likely to play their part as elements of an interactive web rather than independent entities.

Original languageEnglish
Pages (from-to)1753-1759
Number of pages7
JournalProceedings of the Royal Society of London. B, Biological Sciences
Issue number1644
Publication statusPublished - 7 Aug 2008


  • disease ecology
  • population dynamics
  • wildlife health
  • host-parasite interaction
  • virus-infectiom
  • body condition
  • mice
  • immunocompetence
  • modulation
  • resistance
  • responses
  • parasites
  • vole


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