Risk of SARS-CoV-2 infection in high and low-risk cohabitants, in Loures and Odivelas, Portugal
Background Effective contact tracing, vaccination, and isolation of cases of SARS-CoV-2 infection and their high-risk contacts constituted measures to contain the spread of COVID-19. In Portugal, in October 2021, low-risk cohabitants were lifted the obligation to isolate. The aim of this study was t...
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| Veröffentlicht in: | European journal of public health 2022-10, Vol.32 (Supplement_3) |
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| creator | Mateus Cunha, I Marques, JL Subtil, IM Bragança Pereira, M Gabriel, C Vieira, C Cordeiro, C Abreu Gomes, F Bastos, L |
| description | Background
Effective contact tracing, vaccination, and isolation of cases of SARS-CoV-2 infection and their high-risk contacts constituted measures to contain the spread of COVID-19. In Portugal, in October 2021, low-risk cohabitants were lifted the obligation to isolate. The aim of this study was to estimate the relative risk of infection for close contacts, regarding the type of close contact and being cohabitants.
Methods
A descriptive longitudinal study, with an analytical component was performed. Sociodemographic and epidemiologic data from close contacts and confirmed cases in Loures and Odivelas, between October and November 2021, was collected from a regional database and from Trace COVID-19 platform. We performed a descriptive analysis and estimated the relative risk of SARS-CoV-2 positive test, stratified by type of contact and cohabitation, with 95% confidence level.
Results
We identified 200 confirmed cases and 428 people who were close contacts, corresponding to 502 different close contacts (59 people had contact with more than a case). From 502 close contacts, 268 were classified as low-risk and 230 as high-risk. Full time cohabitation was present in 310 of close contacts. Between contact tracing day and the next 4 weeks, 58 (10.9%) of close contacts tested positive. Risk of high-risk contacts testing positive was 2.7 [1.5-4.6], compared with low-risk contacts. Risk of cohabitants testing positive was 3.5 [1.6-7.7], compared with non-cohabitants. Risk of a high-risk cohabitant testing positive was 2.2 [1.1-4.4], compared with low-risk cohabitants. There was no higher risk of high-risk cohabitants testing positive compared with high-risk non-cohabitants. Same was true for low-risk cohabitants and non-cohabitants.
Conclusions
These results allow us to understand how to better stratify close contacts and apply isolation measures, according to the risk of testing positive. Further studies should be developed to assess the impact of other variables.
Key messages
* We identified an increased risk of testing positive in high-risk contacts, and in cohabitants.
* Cohabitants could be stratified regarding being high or low-risk, with different measures being applied. |
| doi_str_mv | 10.1093/eurpub/ckac131.093 |
| format | Article |
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Effective contact tracing, vaccination, and isolation of cases of SARS-CoV-2 infection and their high-risk contacts constituted measures to contain the spread of COVID-19. In Portugal, in October 2021, low-risk cohabitants were lifted the obligation to isolate. The aim of this study was to estimate the relative risk of infection for close contacts, regarding the type of close contact and being cohabitants.
Methods
A descriptive longitudinal study, with an analytical component was performed. Sociodemographic and epidemiologic data from close contacts and confirmed cases in Loures and Odivelas, between October and November 2021, was collected from a regional database and from Trace COVID-19 platform. We performed a descriptive analysis and estimated the relative risk of SARS-CoV-2 positive test, stratified by type of contact and cohabitation, with 95% confidence level.
Results
We identified 200 confirmed cases and 428 people who were close contacts, corresponding to 502 different close contacts (59 people had contact with more than a case). From 502 close contacts, 268 were classified as low-risk and 230 as high-risk. Full time cohabitation was present in 310 of close contacts. Between contact tracing day and the next 4 weeks, 58 (10.9%) of close contacts tested positive. Risk of high-risk contacts testing positive was 2.7 [1.5-4.6], compared with low-risk contacts. Risk of cohabitants testing positive was 3.5 [1.6-7.7], compared with non-cohabitants. Risk of a high-risk cohabitant testing positive was 2.2 [1.1-4.4], compared with low-risk cohabitants. There was no higher risk of high-risk cohabitants testing positive compared with high-risk non-cohabitants. Same was true for low-risk cohabitants and non-cohabitants.
Conclusions
These results allow us to understand how to better stratify close contacts and apply isolation measures, according to the risk of testing positive. Further studies should be developed to assess the impact of other variables.
Key messages
* We identified an increased risk of testing positive in high-risk contacts, and in cohabitants.
* Cohabitants could be stratified regarding being high or low-risk, with different measures being applied.</description><identifier>ISSN: 1101-1262</identifier><identifier>EISSN: 1464-360X</identifier><identifier>DOI: 10.1093/eurpub/ckac131.093</identifier><language>eng</language><publisher>Oxford: Oxford University Press</publisher><subject>Cohabitation ; Confidence intervals ; Contact ; Contact tracing ; COVID-19 ; Epidemiology ; Health risks ; Immunization ; Infections ; Longitudinal studies ; Public health ; Risk ; Severe acute respiratory syndrome coronavirus 2 ; Vaccination</subject><ispartof>European journal of public health, 2022-10, Vol.32 (Supplement_3)</ispartof><rights>The Author(s) 2022. Published by Oxford University Press on behalf of the European Public Health Association. 2022</rights><rights>The Author(s) 2022. Published by Oxford University Press on behalf of the European Public Health Association.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,864,1604,27866,27924,27925</link.rule.ids></links><search><creatorcontrib>Mateus Cunha, I</creatorcontrib><creatorcontrib>Marques, JL</creatorcontrib><creatorcontrib>Subtil, IM</creatorcontrib><creatorcontrib>Bragança Pereira, M</creatorcontrib><creatorcontrib>Gabriel, C</creatorcontrib><creatorcontrib>Vieira, C</creatorcontrib><creatorcontrib>Cordeiro, C</creatorcontrib><creatorcontrib>Abreu Gomes, F</creatorcontrib><creatorcontrib>Bastos, L</creatorcontrib><title>Risk of SARS-CoV-2 infection in high and low-risk cohabitants, in Loures and Odivelas, Portugal</title><title>European journal of public health</title><description>Background
Effective contact tracing, vaccination, and isolation of cases of SARS-CoV-2 infection and their high-risk contacts constituted measures to contain the spread of COVID-19. In Portugal, in October 2021, low-risk cohabitants were lifted the obligation to isolate. The aim of this study was to estimate the relative risk of infection for close contacts, regarding the type of close contact and being cohabitants.
Methods
A descriptive longitudinal study, with an analytical component was performed. Sociodemographic and epidemiologic data from close contacts and confirmed cases in Loures and Odivelas, between October and November 2021, was collected from a regional database and from Trace COVID-19 platform. We performed a descriptive analysis and estimated the relative risk of SARS-CoV-2 positive test, stratified by type of contact and cohabitation, with 95% confidence level.
Results
We identified 200 confirmed cases and 428 people who were close contacts, corresponding to 502 different close contacts (59 people had contact with more than a case). From 502 close contacts, 268 were classified as low-risk and 230 as high-risk. Full time cohabitation was present in 310 of close contacts. Between contact tracing day and the next 4 weeks, 58 (10.9%) of close contacts tested positive. Risk of high-risk contacts testing positive was 2.7 [1.5-4.6], compared with low-risk contacts. Risk of cohabitants testing positive was 3.5 [1.6-7.7], compared with non-cohabitants. Risk of a high-risk cohabitant testing positive was 2.2 [1.1-4.4], compared with low-risk cohabitants. There was no higher risk of high-risk cohabitants testing positive compared with high-risk non-cohabitants. Same was true for low-risk cohabitants and non-cohabitants.
Conclusions
These results allow us to understand how to better stratify close contacts and apply isolation measures, according to the risk of testing positive. Further studies should be developed to assess the impact of other variables.
Key messages
* We identified an increased risk of testing positive in high-risk contacts, and in cohabitants.
* Cohabitants could be stratified regarding being high or low-risk, with different measures being applied.</description><subject>Cohabitation</subject><subject>Confidence intervals</subject><subject>Contact</subject><subject>Contact tracing</subject><subject>COVID-19</subject><subject>Epidemiology</subject><subject>Health risks</subject><subject>Immunization</subject><subject>Infections</subject><subject>Longitudinal studies</subject><subject>Public health</subject><subject>Risk</subject><subject>Severe acute respiratory syndrome coronavirus 2</subject><subject>Vaccination</subject><issn>1101-1262</issn><issn>1464-360X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>TOX</sourceid><sourceid>7TQ</sourceid><recordid>eNqNkF1LwzAUhoMoOKd_wKuCt2bLSdIuuRzDLyhMNhXvQtqmW7fa1KRV_Pdmdj_Aq_Py8pyvF6FrIBMgkk1N79o-m-Z7nQODSbBO0Ah4wjFLyPtp0EAAA03oObrwfkcIiWeCjpBaVX4f2TJaz1drvLBvmEZVU5q8q2wTVLStNttIN0VU22_sDnButzqrOt10_vZApLZ3xv8xy6L6MrUO_rN1Xb_R9SU6K3XtzdWxjtHr_d3L4hGny4enxTzFOcSM4ULMBLAMKC8lJGVCCl5SKSjn2kiIM0MEUC0kk8B5kRmdCIg1EF1IbXiesDG6Gea2zn72xndqF85qwkpFRcwlCa_LQNGByp313plSta760O5HAVGHINUQpDoGqYIVmvDQZPv2P_wvrxF2kQ</recordid><startdate>20221021</startdate><enddate>20221021</enddate><creator>Mateus Cunha, I</creator><creator>Marques, JL</creator><creator>Subtil, IM</creator><creator>Bragança Pereira, M</creator><creator>Gabriel, C</creator><creator>Vieira, C</creator><creator>Cordeiro, C</creator><creator>Abreu Gomes, F</creator><creator>Bastos, L</creator><general>Oxford University Press</general><general>Oxford Publishing Limited (England)</general><scope>TOX</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7T2</scope><scope>7TQ</scope><scope>C1K</scope><scope>DHY</scope><scope>DON</scope><scope>K9.</scope><scope>NAPCQ</scope></search><sort><creationdate>20221021</creationdate><title>Risk of SARS-CoV-2 infection in high and low-risk cohabitants, in Loures and Odivelas, Portugal</title><author>Mateus Cunha, I ; Marques, JL ; Subtil, IM ; Bragança Pereira, M ; Gabriel, C ; Vieira, C ; Cordeiro, C ; Abreu Gomes, F ; Bastos, L</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c1533-d87813b124f916f60d4f298244ae915be0812a8939144dbea6815a10ad9ae4c63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Cohabitation</topic><topic>Confidence intervals</topic><topic>Contact</topic><topic>Contact tracing</topic><topic>COVID-19</topic><topic>Epidemiology</topic><topic>Health risks</topic><topic>Immunization</topic><topic>Infections</topic><topic>Longitudinal studies</topic><topic>Public health</topic><topic>Risk</topic><topic>Severe acute respiratory syndrome coronavirus 2</topic><topic>Vaccination</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mateus Cunha, I</creatorcontrib><creatorcontrib>Marques, JL</creatorcontrib><creatorcontrib>Subtil, IM</creatorcontrib><creatorcontrib>Bragança Pereira, M</creatorcontrib><creatorcontrib>Gabriel, C</creatorcontrib><creatorcontrib>Vieira, C</creatorcontrib><creatorcontrib>Cordeiro, C</creatorcontrib><creatorcontrib>Abreu Gomes, F</creatorcontrib><creatorcontrib>Bastos, L</creatorcontrib><collection>Access via Oxford University Press (Open Access Collection)</collection><collection>CrossRef</collection><collection>Health and Safety Science Abstracts (Full archive)</collection><collection>PAIS Index</collection><collection>Environmental Sciences and Pollution Management</collection><collection>PAIS International</collection><collection>PAIS International (Ovid)</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Nursing & Allied Health Premium</collection><jtitle>European journal of public health</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mateus Cunha, I</au><au>Marques, JL</au><au>Subtil, IM</au><au>Bragança Pereira, M</au><au>Gabriel, C</au><au>Vieira, C</au><au>Cordeiro, C</au><au>Abreu Gomes, F</au><au>Bastos, L</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Risk of SARS-CoV-2 infection in high and low-risk cohabitants, in Loures and Odivelas, Portugal</atitle><jtitle>European journal of public health</jtitle><date>2022-10-21</date><risdate>2022</risdate><volume>32</volume><issue>Supplement_3</issue><issn>1101-1262</issn><eissn>1464-360X</eissn><abstract>Background
Effective contact tracing, vaccination, and isolation of cases of SARS-CoV-2 infection and their high-risk contacts constituted measures to contain the spread of COVID-19. In Portugal, in October 2021, low-risk cohabitants were lifted the obligation to isolate. The aim of this study was to estimate the relative risk of infection for close contacts, regarding the type of close contact and being cohabitants.
Methods
A descriptive longitudinal study, with an analytical component was performed. Sociodemographic and epidemiologic data from close contacts and confirmed cases in Loures and Odivelas, between October and November 2021, was collected from a regional database and from Trace COVID-19 platform. We performed a descriptive analysis and estimated the relative risk of SARS-CoV-2 positive test, stratified by type of contact and cohabitation, with 95% confidence level.
Results
We identified 200 confirmed cases and 428 people who were close contacts, corresponding to 502 different close contacts (59 people had contact with more than a case). From 502 close contacts, 268 were classified as low-risk and 230 as high-risk. Full time cohabitation was present in 310 of close contacts. Between contact tracing day and the next 4 weeks, 58 (10.9%) of close contacts tested positive. Risk of high-risk contacts testing positive was 2.7 [1.5-4.6], compared with low-risk contacts. Risk of cohabitants testing positive was 3.5 [1.6-7.7], compared with non-cohabitants. Risk of a high-risk cohabitant testing positive was 2.2 [1.1-4.4], compared with low-risk cohabitants. There was no higher risk of high-risk cohabitants testing positive compared with high-risk non-cohabitants. Same was true for low-risk cohabitants and non-cohabitants.
Conclusions
These results allow us to understand how to better stratify close contacts and apply isolation measures, according to the risk of testing positive. Further studies should be developed to assess the impact of other variables.
Key messages
* We identified an increased risk of testing positive in high-risk contacts, and in cohabitants.
* Cohabitants could be stratified regarding being high or low-risk, with different measures being applied.</abstract><cop>Oxford</cop><pub>Oxford University Press</pub><doi>10.1093/eurpub/ckac131.093</doi><oa>free_for_read</oa></addata></record> |
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| source | PubMed Central Free; DOAJ Directory of Open Access Journals; PAIS Index; Access via Oxford University Press (Open Access Collection); EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Cohabitation Confidence intervals Contact Contact tracing COVID-19 Epidemiology Health risks Immunization Infections Longitudinal studies Public health Risk Severe acute respiratory syndrome coronavirus 2 Vaccination |
| title | Risk of SARS-CoV-2 infection in high and low-risk cohabitants, in Loures and Odivelas, Portugal |
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