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Texting young people about safe sex does not reduce chlamydia, gonorrhea reinfection

More reinfections occurred in the group receiving texts than in the control group, prompting the researchers to call for rigorous evaluation of health communication interventions.

Photo by Patrick Tomasso from Unsplash.com

Time to reconsider tech-based strategies to sexual health?

Sending regular texts to young people who have recently had a sexually transmitted infection (STI) to encourage safer sex behaviors does not reduce rates of chlamydia and gonorrhea reinfection, finds a trial published by The BMJ.

In fact, the findings show that more reinfections occurred in the group receiving texts than in the control group, prompting the researchers to call for rigorous evaluation of health communication interventions.

Rates of STIs such as chlamydia and gonorrhoea are highest in people aged 16-24 years.

Health communications delivered by text message are cheap and effective for some behaviors, such as stopping smoking, and the World Health Organization (WHO) currently recommends digital health communication for sexual and reproductive health. 

But a review on the effects of sexual health interventions delivered by text message found little high quality evidence, while the effects on key behaviours such as condom use, partner notification, and outcomes of sexually transmitted infections (STIs) were still uncertain.

To fill this knowledge gap, a team of UK researchers set out to measure the effects of a series of text messages (‘safetxt’) on rates of chlamydia and gonorrhoea reinfection in young people at one year.

Their findings are based on over 6,000 people aged 16-24 years recruited from 92 sexual health clinics across the UK with a recent diagnosis of, or treatment for, chlamydia, gonorrhoea, or non-specific urethritis between 1 April 2016 and 23 November 2018.

A total of 3,123 participants were randomly assigned to the safetxt intervention and received a series of text messages to improve sex behaviors: four texts daily for days 1-3, one or two daily for days 4-28, two or three weekly for month 2, and 2-5 monthly for months 3-12.  A further 3125 control participants received a monthly text message for one year asking for any change to postal or email address.

The researchers expected that safetxt would reduce the risk of chlamydia and gonorrhoea reinfection at one year by improving three key safer sex behaviours: partner notification at one month, condom use, and sexually transmitted infection testing before unprotected sex with a new partner. 

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Overall, data were available for 4,675 (75%) participants and characteristics such as age, ethnicity, education, and sexual orientation were similar between the groups at the start of the trial.

At one year, the rate of chlamydia or gonorrhoea reinfection was 22% (693 out of 3123) in the safetxt group versus 20% (633 out of 3125) in the control group. At four weeks, 86% of participants in the intervention group versus 84% in the control group had notified the last partner they had sex with before testing positive to get treatment. Also at four weeks, 42% of participants in the intervention group versus 40% in the control group reported using a condom at last sexual encounter, and this difference was sustained at 12 months (34% intervention v 31% control). And at one year, 54% of participants in the intervention group versus 49% in the control group reported using a condom at first sexual encounter with their most recent new partner, but the number of STIs was not reduced.

The proportion of people with a new partner and with two or more partners at one year was also higher in the intervention group.

“Our text message intervention was grounded in psychological theory, incorporating the best evidence on health behavior change, but it did not have the effects we anticipated,” they write. “In light of our results, WHO should revise its endorsement of digital behavior change communication for strengthening health systems, to specify which topics and content WHO endorses.”

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