Updated in 8/3/2011 4:47:18 PM      Viewed: 110 times      (Journal Article)
Proc. R. Soc. Lond. Ser. B-Biol. Sci. 260 (1359): 321-327 (1995)

The Population-Dynamics of Vertically and Horizontally Transmitted Parasites

M Lipsitch , M A Nowak , D Ebert , R M May
We analyse a model of the transmission dynamics of a parasite transmitted both vertically and horizontally. The basic reproductive ratio (R(0)) of the parasite is shown to be a sum of horizontal and vertical components. We derive expressions for the equilibrium prevalence of infection for a mixture of horizontal and vertical transmission; prevalence can reach 100% if transmission is sufficiently high. At the endemic equilibrium, if prevalence is high, most transmission will in general be vertical, but horizontal transmission rates must be high to reach and stably maintain such an equilibrium. Surprisingly, for such parasites the highest equilibrium rates of vertical transmission are observed when horizontal transmission is very effective. We discuss the implications for assessing the importance of horizontal v. vertical transmission from field data, and we suggest some implications for the evolution of virulence.
The Population-Dynamics of Vertically and Horizontally Transmitted ParasitesISI:A1995RJ57600014JUN 22 PROC ROY SOC LONDON SER BNA