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Calculating the basic reproductive rate Ro when there are 2 or more pathogens.

R D Baker

    Annales De La Societe Belge De Medecine Tropicale
    |January 1, 1989
    PubMed
    Summary
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    Observed trypanosome prevalences in livestock may appear linked due to population factors and treatments, not just direct infection interactions. Calculating the basic reproductive rate (R0) helps understand these complex pathogen dynamics.

    Area of Science:

    • Veterinary Parasitology
    • Epidemiology
    • Disease Ecology

    Background:

    • Observed trypanosome prevalences in cattle and livestock often appear correlated.
    • This correlation may arise from factors beyond direct pathogen interactions.

    Purpose of the Study:

    • To explore reasons behind non-independent prevalences of major trypanosomes in livestock.
    • To explain the calculation and utility of the basic reproductive rate (R0) in multi-pathogen contexts.

    Main Methods:

    • Discussion of factors influencing pathogen correlation, including population heterogeneity and interventions.
    • Explanation of the basic reproductive rate (R0) calculation for a pathogen in the presence of another.

    Main Results:

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  • Population averaging and interventions like chemotherapy and mortality can induce apparent positive correlations between trypanosome infections.
  • The basic reproductive rate (R0) calculation is demonstrated as a feasible method for assessing pathogen impact.

    • Conclusions:

    • Non-independence of trypanosome prevalences can be an artifact of population structure and control measures.
    • Calculating R0 is a valuable, albeit complex, tool for understanding endemic multi-pathogen systems in livestock.