Age-specific infectious period shapes dynamics of pneumonia in bighorn sheep

Raina K. Plowright, Kezia R. Manlove, Thomas E. Besser, David J. Páez, Kimberly R. Andrews, Patrick E. Matthews, Lisette P. Waits, Peter J. Hudson, E. Frances Cassirer

Research output: Contribution to journalLetterpeer-review

29 Scopus citations


Superspreading, the phenomenon where a small proportion of individuals contribute disproportionately to new infections, has profound effects on disease dynamics. Superspreading can arise through variation in contacts, infectiousness or infectious periods. The latter has received little attention, yet it drives the dynamics of many diseases of critical public health, livestock health and conservation concern. Here, we present rare evidence of variation in infectious periods underlying a superspreading phenomenon in a free-ranging wildlife system. We detected persistent infections of Mycoplasma ovipneumoniae, the primary causative agent of pneumonia in bighorn sheep (Ovis canadensis), in a small number of older individuals that were homozygous at an immunologically relevant genetic locus. Interactions among age-structure, genetic composition and infectious periods may drive feedbacks in disease dynamics that determine the magnitude of population response to infection. Accordingly, variation in initial conditions may explain divergent population responses to infection that range from recovery to catastrophic decline and extirpation.

Original languageEnglish (US)
Pages (from-to)1325-1336
Number of pages12
JournalEcology Letters
Issue number10
StatePublished - Oct 2017

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics


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