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    • Keywords


      Geriatric infections; host–parasite co-evolution; immunity; microbiota; pathogens

    • Abstract


      In host–parasite co-evolution, parasites are assumed to have an advantage owing to their shorter generationtime. Evolution of pathogens within the lifetime of a host individual is implicated as a strong selective force inthe evolution of sex and aging in the host. However, this assumption or its testable predictions have not beenexamined empirically. We classified infectious bacteria and viruses into those that can have continued longtermexistence on the host body (group 1) versus those that have only a short-term interaction during an activeinfection (group 2). We surveyed the literature for age-specific incidence data about infections from both thegroups. The age trends of the two groups show contrasting patterns. The incidence of infections by all group 1pathogens showed a 2.28- to 28-fold increase in older ages. In group 2, 6 out of the 9 pathogens showed asignificant declining trend in incidence with age. In both groups, there was greater mortality or morbidityamong the infected in the old-age classes. These patterns are better explained by pathogen evolution than byage-related decline in immunity.

    • Author Affiliations



      1. Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune 411 008, India
      2. Deenanath Mangeshkar Hospital and Research Centre, Erandawne, Pune 411 004, India
    • Dates

    • Supplementary Material

  • Journal of Biosciences | News

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      Posted on July 25, 2019

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