Scale-free networks and sexually transmitted diseases: a description of observed patterns of sexual contacts in Britain and Zimbabwe.

Abstract:

BACKGROUND:Sexually transmitted infections spread through a network of contacts created by the formation of sexual partnerships. In physics, networks have been characterized as "scale-free" if they follow a power law with an exponent between 2 and 3. OBJECTIVE:The objective of this study was to test statistically whether distributions of numbers of sexual partners reported from different populations are well described by power laws. STUDY DESIGN:Power laws and an exponential null model are fitted by maximum likelihood techniques to reported distributions of numbers of partners. Data are taken from 4 population-based surveys, 3 from Britain and 1 from rural Zimbabwe. RESULTS:The networks can be described by power laws over a number of orders of magnitude. In addition, the derived exponents differ significantly and meaningfully, with an "accelerating network" formed between men who have sex with men (MSM). CONCLUSIONS:A scale-free network approach provides a reasonable description of distributions of reported numbers of sexual partners.

journal_name

Sex Transm Dis

authors

Schneeberger A,Mercer CH,Gregson SA,Ferguson NM,Nyamukapa CA,Anderson RM,Johnson AM,Garnett GP

doi

10.1097/00007435-200406000-00012

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

380-7

issue

6

eissn

0148-5717

issn

1537-4521

pii

00007435-200406000-00012

journal_volume

31

pub_type

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