{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T20:42:27Z","timestamp":1777927347488,"version":"3.51.4"},"reference-count":20,"publisher":"SAGE Publications","issue":"6","license":[{"start":{"date-parts":[[2021,2,3]],"date-time":"2021-02-03T00:00:00Z","timestamp":1612310400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Int J STD AIDS"],"published-print":{"date-parts":[[2021,5]]},"abstract":"<jats:p>Guidance on contact tracing in Chlamydia trachomatis (CT) is limited. CT contacts data over 12\u00a0months (1 December 2018\u201329 November 2019) at a UK sexual health clinic were analysed to determine the appropriateness of the currently recommended six-month \u2018look-back\u2019 interval. Age and sex of CT contacts were associated with clinical outcomes. Subgroups of 100 CT positive\/negative contacts (each N = 100) were randomly selected. The relationship between time since sexual intercourse with the index case (Last Sexual Intercourse; LSI) and CT positivity was examined; suitability of varying look-back intervals was explored. Of 891 CT contacts (mean age = 25.0\u00a0years, 66.2% men), 66.9% tested positive for CT. Positive CT contacts were significantly younger (23.8 \u00b1 6.8\u00a0years vs. 27.4 \u00b1 9.1, p &lt; 0.001) and more often women (36.4% vs. 28.5%, p = 0.018) than negative contacts. In the subgroups, the Mann\u2013Whitney U test revealed no significant difference between the LSI of positive and negative contacts ( p = 0.081). 95% of positive CT contacts ( N = 82) were captured within a hypothetical three-month look-back interval. While most CT positive contacts were captured within three months, they appeared to remain proportionately represented beyond this point. Although this supports current guidelines, further research should investigate whether CT contacts involved in longer look-back intervals may require disproportionately greater resources to trace.<\/jats:p>","DOI":"10.1177\/0956462420980949","type":"journal-article","created":{"date-parts":[[2021,2,5]],"date-time":"2021-02-05T14:02:03Z","timestamp":1612533723000},"page":"533-537","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Analysis of chlamydia contacts and the look-back interval at a UK sexual health clinic"],"prefix":"10.1177","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2914-1790","authenticated-orcid":false,"given":"Catherine","family":"Turner","sequence":"first","affiliation":[{"name":"Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sally E","family":"Howlett","sequence":"additional","affiliation":[{"name":"Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hannah","family":"Loftus","sequence":"additional","affiliation":[{"name":"Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2021,2,3]]},"reference":[{"key":"bibr1-0956462420980949","unstructured":"Public Health England. Sexually transmitted infections and screening for chlamydia in England, https:\/\/assets.publishing.service.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/914184\/STI_NCSP_report_2019.pdf (2019, accessed September 2020)."},{"key":"bibr2-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1016\/S1473-3099(16)30092-5"},{"key":"bibr3-0956462420980949","unstructured":"Public Health England. National chlamydia screening programme standards, https:\/\/assets.publishing.service.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/759846\/NCSP_Standards_7th_edition_update_November_2018.pdf (2018, accessed September 2020)."},{"key":"bibr4-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1177\/0956462417746897"},{"key":"bibr5-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1177\/0956462412472804"},{"key":"bibr6-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1136\/bmjopen-2018-024828"},{"key":"bibr7-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1071\/SH05021"},{"key":"bibr8-0956462420980949","unstructured":"British National Formulary. https:\/\/bnf.nice.org.uk\/drug\/doxycycline.html (2020, accessed July 2020)."},{"key":"bibr9-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1097\/CM9.0000000000000245"},{"key":"bibr10-0956462420980949","unstructured":"Public Health England. GUMCAD STI surveillance system \u2013 clinical guidelines, https:\/\/assets.publishing.service.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/816919\/GUMCAD_STI_Surveillance_System-Clinical_guidance_July-2019.pdf (2019, accessed September 2020)."},{"key":"bibr11-0956462420980949","unstructured":"Random Integer Generator, https:\/\/www.random.org\/integers\/ (2020, accessed September 2020)."},{"key":"bibr12-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1177\/0956462419879615"},{"key":"bibr13-0956462420980949","unstructured":"Public Health England. Partner notification in chlamydia screening. National audit report May 2016, https:\/\/assets.publishing.service.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/736121\/NCSP_PN_audit_report_FINAL.pdf (2016, accessed September 2020)."},{"key":"bibr14-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1186\/1471-2334-13-534"},{"key":"bibr15-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1097\/OLQ.0b013e318206c288"},{"key":"bibr16-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1007\/s10729-007-9027-6"},{"key":"bibr17-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1177\/0956462420956852"},{"key":"bibr18-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1007\/s40588-016-0028-4"},{"key":"bibr19-0956462420980949","doi-asserted-by":"publisher","DOI":"10.1186\/s12879-015-1030-9"},{"key":"bibr20-0956462420980949","unstructured":"BASHH Clinical Effectiveness Group. Update on the Treatment of Chlamydia trachomatis (CT) Infection, https:\/\/www.bashhguidelines.org\/media\/1191\/update-on-the-treatment-of-chlamydia-trachomatis-infection-final-16-9-18.pdf (2018, accessed August 2020)."}],"container-title":["International Journal of STD &amp; AIDS"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/0956462420980949","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/0956462420980949","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/0956462420980949","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T22:41:38Z","timestamp":1777675298000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/0956462420980949"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,2,3]]},"references-count":20,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2021,5]]}},"alternative-id":["10.1177\/0956462420980949"],"URL":"https:\/\/doi.org\/10.1177\/0956462420980949","relation":{},"ISSN":["0956-4624","1758-1052"],"issn-type":[{"value":"0956-4624","type":"print"},{"value":"1758-1052","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,2,3]]}}}