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Social network investigation of a syphilis outbreak in Ottawa, Ontario.

D'Angelo-Scott H, Cutler J, Friedman D, Hendriks A, Jolly AM - Can J Infect Dis Med Microbiol (2015 Sep-Oct)

Bottom Line: Information regarding social venues where sex partners were met was plotted together with sexual partnerships, linking 18 cases and 40 contacts, representing 37% of the outbreak population and connecting many of the single individuals and dyads.Uncovering the places sex partners met was an effective proxy measure of high-risk activities shared with infected individuals and demonstrates the potential for focusing on interventions at one named bar and one Internet site to reach a high proportion of the population at risk.Abstract available from the publisher.

View Article: PubMed Central - PubMed

Affiliation: Canadian Field Epidemiology Program, Public Health Agency of Canada;

ABSTRACT

Background: The incidence of syphilis in Ottawa, Ontario, has risen substantially since 2000 to six cases per 100,000 in 2003, again to nine cases per 100,000 in 2007, and recently rose to 11 cases per 100,000 in 2010. The number of cases reported in the first quarter of 2010 was more than double that in the first quarter of 2009.

Objective: In May 2010, the Ontario Ministry of Health and Long Term Care requested the assistance of the Field Epidemiology Program to describe the increase in infectious syphilis rates and to identify social network sources and prevention messages.

Methods: Syphilis surveillance data were routinely collected from January 1, 2009 to July 15, 2010, and social networks were constructed from an enhanced social network questionnaire. Univariate comparisons between the enhanced surveillance group and the remaining cases from 2009 on non-normally distributed data were conducted using Kruskal-Wallis tests and χ(2) tests.

Results: The outbreak cases were comprised of 89% men. Seventeen of the 19 most recent cases consented to answer the questionnaire, which revealed infrequent use of condoms, multiple sex partners and sex with a same-sex partner. Information regarding social venues where sex partners were met was plotted together with sexual partnerships, linking 18 cases and 40 contacts, representing 37% of the outbreak population and connecting many of the single individuals and dyads.

Conclusion: Uncovering the places sex partners met was an effective proxy measure of high-risk activities shared with infected individuals and demonstrates the potential for focusing on interventions at one named bar and one Internet site to reach a high proportion of the population at risk.

No MeSH data available.


Related in: MedlinePlus

Sexual network of infectious syphilis cases generated using routinely collected cases and contact data only in a syphilis outbreak, Ottawa, Ontario, January 2009 to June 2010 (n=155). Lines represent sexual contact between individuals
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f3-cjidmm-26-268: Sexual network of infectious syphilis cases generated using routinely collected cases and contact data only in a syphilis outbreak, Ottawa, Ontario, January 2009 to June 2010 (n=155). Lines represent sexual contact between individuals

Mentions: Including the social venue information collected through routine surveillance, only 155 cases and contacts were linked by sexual intercourse in 55 components consisting of 18 single cases; (11.6% of all cases and contacts) (Figure 3); 23 dyads (only two individuals linked (29.7%), six triads (11.6%), three tetrads (7.7%) and components of six, eight, 12 and 16 each, with the largest being 19 individuals (12%) (Figure 3). Of the 19 infectious syphilis cases coinfected with HIV, 63% were in small components of one or two cases and/or contacts. However, the potential for HIV transmission is illustrated in components eight and 14 (marked by arrows) in which cases who had been diagnosed with HIV were linked to HIV-negative individuals with syphilis or untested contacts.


Social network investigation of a syphilis outbreak in Ottawa, Ontario.

D'Angelo-Scott H, Cutler J, Friedman D, Hendriks A, Jolly AM - Can J Infect Dis Med Microbiol (2015 Sep-Oct)

Sexual network of infectious syphilis cases generated using routinely collected cases and contact data only in a syphilis outbreak, Ottawa, Ontario, January 2009 to June 2010 (n=155). Lines represent sexual contact between individuals
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644011&req=5

f3-cjidmm-26-268: Sexual network of infectious syphilis cases generated using routinely collected cases and contact data only in a syphilis outbreak, Ottawa, Ontario, January 2009 to June 2010 (n=155). Lines represent sexual contact between individuals
Mentions: Including the social venue information collected through routine surveillance, only 155 cases and contacts were linked by sexual intercourse in 55 components consisting of 18 single cases; (11.6% of all cases and contacts) (Figure 3); 23 dyads (only two individuals linked (29.7%), six triads (11.6%), three tetrads (7.7%) and components of six, eight, 12 and 16 each, with the largest being 19 individuals (12%) (Figure 3). Of the 19 infectious syphilis cases coinfected with HIV, 63% were in small components of one or two cases and/or contacts. However, the potential for HIV transmission is illustrated in components eight and 14 (marked by arrows) in which cases who had been diagnosed with HIV were linked to HIV-negative individuals with syphilis or untested contacts.

Bottom Line: Information regarding social venues where sex partners were met was plotted together with sexual partnerships, linking 18 cases and 40 contacts, representing 37% of the outbreak population and connecting many of the single individuals and dyads.Uncovering the places sex partners met was an effective proxy measure of high-risk activities shared with infected individuals and demonstrates the potential for focusing on interventions at one named bar and one Internet site to reach a high proportion of the population at risk.Abstract available from the publisher.

View Article: PubMed Central - PubMed

Affiliation: Canadian Field Epidemiology Program, Public Health Agency of Canada;

ABSTRACT

Background: The incidence of syphilis in Ottawa, Ontario, has risen substantially since 2000 to six cases per 100,000 in 2003, again to nine cases per 100,000 in 2007, and recently rose to 11 cases per 100,000 in 2010. The number of cases reported in the first quarter of 2010 was more than double that in the first quarter of 2009.

Objective: In May 2010, the Ontario Ministry of Health and Long Term Care requested the assistance of the Field Epidemiology Program to describe the increase in infectious syphilis rates and to identify social network sources and prevention messages.

Methods: Syphilis surveillance data were routinely collected from January 1, 2009 to July 15, 2010, and social networks were constructed from an enhanced social network questionnaire. Univariate comparisons between the enhanced surveillance group and the remaining cases from 2009 on non-normally distributed data were conducted using Kruskal-Wallis tests and χ(2) tests.

Results: The outbreak cases were comprised of 89% men. Seventeen of the 19 most recent cases consented to answer the questionnaire, which revealed infrequent use of condoms, multiple sex partners and sex with a same-sex partner. Information regarding social venues where sex partners were met was plotted together with sexual partnerships, linking 18 cases and 40 contacts, representing 37% of the outbreak population and connecting many of the single individuals and dyads.

Conclusion: Uncovering the places sex partners met was an effective proxy measure of high-risk activities shared with infected individuals and demonstrates the potential for focusing on interventions at one named bar and one Internet site to reach a high proportion of the population at risk.

No MeSH data available.


Related in: MedlinePlus