Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).

<h4>Background and objectives</h4>Syphilis is an infectious disease caused by T. pallidum subsp. Pallidum. In high-income countries the main mode of transmission is sexual. Approximately half of infected patients are asymptomatic, which does not exclude the possibility of transmission. T...

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Main Authors: Jose Luis Pérez-Arellano, Araceli Hernández Betancor, Oscar Sanz Peláez, Jose Curbelo, Michele Hernández Cabrera, Elena Pisos Álamo, Nieves Jaén Sánchez, Laura Suárez Hormiga, Carmen Lavilla Salgado, Laura López Delgado, Sandra González Linares, Cristina Carranza-Rodríguez
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2025-01-01
Series:PLoS ONE
Online Access:https://doi.org/10.1371/journal.pone.0325073
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author Jose Luis Pérez-Arellano
Araceli Hernández Betancor
Oscar Sanz Peláez
Jose Curbelo
Michele Hernández Cabrera
Elena Pisos Álamo
Nieves Jaén Sánchez
Laura Suárez Hormiga
Carmen Lavilla Salgado
Laura López Delgado
Sandra González Linares
Cristina Carranza-Rodríguez
author_facet Jose Luis Pérez-Arellano
Araceli Hernández Betancor
Oscar Sanz Peláez
Jose Curbelo
Michele Hernández Cabrera
Elena Pisos Álamo
Nieves Jaén Sánchez
Laura Suárez Hormiga
Carmen Lavilla Salgado
Laura López Delgado
Sandra González Linares
Cristina Carranza-Rodríguez
author_sort Jose Luis Pérez-Arellano
collection DOAJ
description <h4>Background and objectives</h4>Syphilis is an infectious disease caused by T. pallidum subsp. Pallidum. In high-income countries the main mode of transmission is sexual. Approximately half of infected patients are asymptomatic, which does not exclude the possibility of transmission. The aim of this study was to evaluate syphilis seroprevalence among asymptomatic persons in Gran Canaria (Canary Islands, Spain).<h4>Patients and methods</h4>Three different groups were studied from 2001 to 2020: i) a "blood donor" sample of 948,869 voluntary blood donations as a proxy of health population.; ii) undocumented African immigrants, including 1,873 recent arrivals in Gran Canaria; and iii) people living with HIV (PLWH), a group of 1,690 patients followed by our team. The evaluation included both treponemal and reaginic tests.<h4>Results</h4>i) among blood donors, the mean seroprevalence of positive treponemal tests was 0.25% (95% CI: 0.19-0.31). Non-treponemal test positivity (RPR) ranged from 0.05 to 0.06% with titers ≤ 1:4 in all cases; ii) thirty-four of 641 undocumented African migrants (5.30%; 95% CI: 3.82-7.32%) had a confirmed positive treponemal test but only 4 had a positive RPR, with titers ranging from 1:1-1:4; iii) 46.51% (95% CI: 44.14-48.89) of PLWH patients had a confirmed positive treponemal test. For factors related to HIV-syphilis coinfection, multivariate analysis clearly showed the association with male sex and the MSM risk category. However, the results of this series call into question the overall role of immigration in the seroprevalence of syphilis among PLWH in our setting. Active syphilis (RPR > 1:8) was found in 20.10% of PLWH.<h4>Conclusions</h4>In summary, syphilis is a re-emerging infection, and asymptomatic persons constitute a group that facilitates its transmission and spread. In our setting, seroprevalence was lowest in blood donors, higher in recently arrived African migrants, and highest in PLWH, especially MSM. The presence of active syphilis however is mainly restricted to MSM. This information is of relevance for the design of syphilis control strategies.
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spelling doaj-art-d155baca07a74203bd50c3f5f62bf4cb2025-08-20T02:35:54ZengPublic Library of Science (PLoS)PLoS ONE1932-62032025-01-01207e032507310.1371/journal.pone.0325073Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).Jose Luis Pérez-ArellanoAraceli Hernández BetancorOscar Sanz PeláezJose CurbeloMichele Hernández CabreraElena Pisos ÁlamoNieves Jaén SánchezLaura Suárez HormigaCarmen Lavilla SalgadoLaura López DelgadoSandra González LinaresCristina Carranza-Rodríguez<h4>Background and objectives</h4>Syphilis is an infectious disease caused by T. pallidum subsp. Pallidum. In high-income countries the main mode of transmission is sexual. Approximately half of infected patients are asymptomatic, which does not exclude the possibility of transmission. The aim of this study was to evaluate syphilis seroprevalence among asymptomatic persons in Gran Canaria (Canary Islands, Spain).<h4>Patients and methods</h4>Three different groups were studied from 2001 to 2020: i) a "blood donor" sample of 948,869 voluntary blood donations as a proxy of health population.; ii) undocumented African immigrants, including 1,873 recent arrivals in Gran Canaria; and iii) people living with HIV (PLWH), a group of 1,690 patients followed by our team. The evaluation included both treponemal and reaginic tests.<h4>Results</h4>i) among blood donors, the mean seroprevalence of positive treponemal tests was 0.25% (95% CI: 0.19-0.31). Non-treponemal test positivity (RPR) ranged from 0.05 to 0.06% with titers ≤ 1:4 in all cases; ii) thirty-four of 641 undocumented African migrants (5.30%; 95% CI: 3.82-7.32%) had a confirmed positive treponemal test but only 4 had a positive RPR, with titers ranging from 1:1-1:4; iii) 46.51% (95% CI: 44.14-48.89) of PLWH patients had a confirmed positive treponemal test. For factors related to HIV-syphilis coinfection, multivariate analysis clearly showed the association with male sex and the MSM risk category. However, the results of this series call into question the overall role of immigration in the seroprevalence of syphilis among PLWH in our setting. Active syphilis (RPR > 1:8) was found in 20.10% of PLWH.<h4>Conclusions</h4>In summary, syphilis is a re-emerging infection, and asymptomatic persons constitute a group that facilitates its transmission and spread. In our setting, seroprevalence was lowest in blood donors, higher in recently arrived African migrants, and highest in PLWH, especially MSM. The presence of active syphilis however is mainly restricted to MSM. This information is of relevance for the design of syphilis control strategies.https://doi.org/10.1371/journal.pone.0325073
spellingShingle Jose Luis Pérez-Arellano
Araceli Hernández Betancor
Oscar Sanz Peláez
Jose Curbelo
Michele Hernández Cabrera
Elena Pisos Álamo
Nieves Jaén Sánchez
Laura Suárez Hormiga
Carmen Lavilla Salgado
Laura López Delgado
Sandra González Linares
Cristina Carranza-Rodríguez
Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).
PLoS ONE
title Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).
title_full Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).
title_fullStr Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).
title_full_unstemmed Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).
title_short Treponema pallidum infection in asymptomatic persons: A puzzling scenario in the Canary Islands (Spain) (2001-2020).
title_sort treponema pallidum infection in asymptomatic persons a puzzling scenario in the canary islands spain 2001 2020
url https://doi.org/10.1371/journal.pone.0325073
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