SYMPOSIUM

Populations, pathogens, and epidemic phases: closing the gap between theory and practice in the prevention of sexually transmitted diseases

J F Blanchard

Correspondence to:
Correspondence to:
J F Blanchard, Department of Community Health Sciences, University of Manitoba, 750 Bannatyne Avenue, Room S100A, Winnipeg, Manitoba, Canada R3E 0W3;
james_blanchard{at}umanitoba.ca

The phase specific model for the prevention and control of sexually transmitted infections (STI) offers new insights into the strategic planning of programmes. The model illustrates the importance of modifying the focus of prevention and control activities to different subpopulations as the epidemic evolves over time. However, the practical application of phase specific approaches will depend on an understanding of the variability and determinants in the trajectory by which STI epidemics progress through epidemic phases. This paper draws on empirical observations from diverse populations to explore the influence of sexual behaviour patterns in populations, the biological characteristics of STI pathogens, and the population–pathogen interactions in relation to epidemic trajectories. In addition, various approaches to the determination of epidemic phase are presented.

Keywords: sexually transmitted disease; prevention; public health

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