Getting the message straight: effects of a brief hepatitis prevention intervention among injection drug users
- Lauretta E Grau†1Email author,
- Traci C Green†1,
- Merrill Singer2, 3,
- Ricky N Bluthenthal4,
- Patricia A Marshall5 and
- Robert Heimer1
© Grau et al; licensee BioMed Central Ltd. 2009
Received: 30 January 2009
Accepted: 15 December 2009
Published: 15 December 2009
To redress gaps in injection drug users' (IDUs) knowledge about hepatitis risk and prevention, we developed a brief intervention to be delivered to IDUs at syringe exchange programs (SEPs) in three US cities. Following a month-long campaign in which intervention packets containing novel injection hygiene supplies and written materials were distributed to every client at each visit, intervention effectiveness was evaluated by comparing exposed and unexposed participants' self-reported injection practices. Over one-quarter of the exposed group began using the novel hygiene supplies which included an absorbent pad ("Safety Square") to stanch blood flow post-injection. Compared to those unexposed to the intervention, a smaller but still substantial number of exposed participants continued to inappropriately use alcohol pads post-injection despite exposure to written messages to the contrary (22.8% vs. 30.0%). It should also be noted that for those exposed to the intervention, 8% may have misused Safety Squares as part of pre-injection preparation of their injection site; attention should be paid to providing explicit and accurate instruction on the use of any health promotion materials being distributed. While this study indicates that passive introduction of risk reduction materials in injection drug users through syringe exchange programs can be an economical and relatively simple method of changing behaviors, discussions with SEP clients regarding explicit instructions about injection hygiene and appropriate use of novel risk reduction materials is also needed in order to optimize the potential for adoption of health promotion behaviors. The study results suggest that SEP staff should provide their clients with brief, frequent verbal reminders about the appropriate use when distributing risk reduction materials. Issues related to format and language of written materials are discussed.
The "Diffusion of Benefit through Syringe Exchanges Programs" (DOB) project, a longitudinal study of 584 active injection drug users (IDUs) in Chicago, IL, Hartford, CT, and Oakland, CA, used chain referral, ethnographic methods, semi-structured interviews, and mark-and-recapture techniques to measure diffusion of risk reduction supplies and messages from syringe exchange programs (SEPs) into the larger IDU community. Preliminary findings from the main study indicated that many IDUs improperly stanched their blood flow post-injection, and SEP clients were especially likely to misuse alcohol pads for this purpose . Since alcohol inhibits coagulation, post-injection use increases the volume of spilled blood and leaves wound sites open to potential infection (e.g., hepatitis B and C). Based upon these findings, we developed a brief hepatitis prevention intervention. The intervention was easily integrated into existing SEP operations with minimal staff burden. The current sub-study assesses whether injection hygiene messages included in this brief intervention were associated with exposure to the intervention and whether the intervention messages and materials diffused beyond the point of distribution and into the larger IDU community.
We conducted the hepatitis intervention sub-study in Year 2 of the four-year longitudinal study. The study design for the main study, methods, population characteristics, and injection-associated behaviors are described elsewhere [1–3]. Recruitment for the main study was via snowball sampling, initiating at the SEPs, and we were thus able to subsequently categorize participants according to the extent of their SEP use. Participants were interviewed away from SEP sites, most typically on the streets or at DOB storefronts. They were administered a semi-structured interview that assessed pre- and post-injection practices and familiarity with and use of the SSs. The analyses reported herein are based solely on the self-reported data collected from the 208 DOB participants successfully contacted and interviewed for this sub-study.
Following the month-long distribution period, DOB participants were contacted in the field and shown SSs prior to administering the hepatitis intervention survey. Those reporting that they had seen one previously and correctly identified its purpose were classifed as exposed to the intervention; those incorrectly identifying the SSs or reporting never having seen it before were considered 'unexposed'.
This sub-study is a secondary analysis of self-reported data, and we limited our analyses to bivariate analyses only (Chi-square tests, Fisher's exact tests, t-tests) to examine differences between exposed and unexposed participants on sociodemographics and the two injection hygiene messages targeted in the intervention (i.e., pre-injection cleaning and post-injecting stanching practices).
A total of 208 participants were interviewed between June 2000 and July 2001. The larger DOB cohort and the sub-study sample were comparable across sociodemographic and drug use characteristic except that the sub-study group had significantly (p < 0.05) fewer Whites (7.2% vs. 23.7%), more African Americans (55.3% vs. 33.8%), and fewer self-reported histories of hepatitis C infection (12.9% vs. 87.1%). There were also more participants from Chicago (57.2% vs. 45.2%) and Hartford (30.8% vs. 22.1%) and fewer from Oakland (12.0% vs. 32.7%) than in the larger DOB cohort.
The sub-study sample was 59.6% male, 92.8% from racial/ethnic minority groups, and predominantly heroin injectors. The mean age was 41.4 years (SD 9.0), and 12.2% had less than a 9th-grade education. On average, participants had been injecting for 18 years (SD 11.1). In the previous month, the mean number of injections was 86.9 (SD 69.4), mean injections per syringe was 6.1 (SD 12.6), and 20.9% of participants reported receptive syringe sharing at least once within the previous 30 days. No differences were noted in injection behaviors between the exposed and unexposed groups in the above injection characteristics.
Characteristics of Safety Square intervention participants
Unexposed to intervention
n = 118 (%)
Exposed to Intervention
n = 90 (%)
n = 208 (%)
Test statistic, p-value
15.15, p < .001
Age [mean (SD)]
17.29, p < .001*
Less than high school education
Earning <$1000 per month
6.0, p = .01
Drug treatment (Ever)
Ever tested for HIV
Hepatitis of unknown etiology
Hepatitis B vaccinated (ever)
Heroin as the drug injected most often in past 30 days
Pre-injection hygiene appeared to be generally adequate, with most participants stating that they usually used alcohol pads (92.5%) or water (32.5%) to clean their injection site. It is of note that 8.1% of the exposed group also reported using SSs at pre-injection despite written instructions to use them only at post-injection. It was unclear whether SSs were used to clean the skin with alcohol or soap and water, although it seems unlikely as these items were rarely observed during ethnographic activities associated with the main study.
Finally, we assessed the effectiveness of prevention messages contained in the palm card. Several of these messages were consistent with other messages emanating from the SEPs (e.g., use of clean cookers and water and the washing of hands). These three messages were all but uniformly endorsed by both exposed and unexposed groups (clean cookers: exposed = 91.3%, unexposed = 95.8%; clean water: exposed = 92.5%, unexposed = 95.8%; clean hands: exposed = 87.5%, unexposed = 91.7%). In contrast, the exposed group was less likely to endorse messages about improving injection hygiene via pre-injection cleaning of tourniquets (38.8% vs. 59.2%; Χ2 4.74, p = .03), drug preparation surfaces (72.5% vs. 84.4%; Χ2 3.71, p = .03), or clothes (51.3% vs. 77.1%; Χ2 12.9, p < .0001).
Over one quarter of those exposed to the intervention reported adopting use of SSs, providing preliminary evidence that low-intensity interventions can benefit the public health. Although those who were exposed to the intervention were significantly more likely to be SEP clients, non-client exposure rates suggested that some diffusion of the intervention occurred into the larger IDU community.
However, the accompanying written material was not so well received. The palm card's 10th grade reading level may have been too high. Although we know of no assessments of reading levels among IDU populations, one possibility is that the palm card was not easily comprehended. The readability scores of other materials designed for IDUs have generally been lower, around 7th grade . It may be that the formatting of printed materials may be as important as their content. Inappropriate use of SSs may have been less likely to occur if the message had appeared earlier in the palm card and/or the number of unique messages had been fewer.
The findings also suggest that, while passive distribution of risk reduction materials may be associated with subsequent adoption of healthier behaviors, such campaigns may not be sufficient if not accompanied by frank dialogue and explicit instructions about appropriate use of these materials. Injectors may be unaware of the anticoagulation property of alcohol, instead believing that post-injection swabbing with alcohol protects against blood-borne infections. SEPs routinely distribute health promotion brochures, and customers may become inured or confused by the plethora of information. Communication problems continue to plague HIV risk reduction efforts: condom misuse persists despite package inserts and condom use campaigns [5, 6]. Our findings are consistent with reports of unintended consequences of SEP-based HIV prevention activities  and suggest that, along with continued distribution of risk reduction materials, risk reduction staff should be encouraged to instruct their clients - briefly and often - about the proper use of these materials.
Study limitations such as non-random sampling and social desirability factors may reduce the potential generalizability of the findings. However, at the time of the hepatitis intervention sub-study our research staff had long-standing relationships (>1 year) with participants, having observed and interacted with them away from the SEPs; social desirability factors are therefore considered to be minimal, and differences in exposure across the three sites could be due to structural differences among SEPs such as location, hours of operation, legal status, between-city differences in the dynamics of injecting drug use, syringe availability, or other reasons . It is also possible that the Safety Square and the palm card could have been uncoupled. This may have resulted in some participants having been exposed to only one part of the intervention (i.e., the Safety Square). We therefore have limited evidence to suggest that the intervention worked, and a more rigorously verifiable definition of exposure would be warranted in any large scale evaluation of intervention efficacy.
In conclusion, the brief intervention that was implemented in this study resulted in a modest uptake by the injecting community, and intervention messages and materials diffused beyond the SEPS from which they originated. However, when developing written material, its content and format should be carefully reviewed and beta-tested to ensure that it is clear, understandable, and acceptable to targeted audience. Finally, while these written materials are useful in disseminating harm reduction messages, they should never supplant frank and open discussions of harm reduction strategies with end-users.
The authors would like to thank the National Institute on Drug Abuse for funding the "Diffusion of Benefit through Syringe Exchange" project. The project was part of the Yale Center for Interdisciplinary Research on AIDS (CIRA), which was supported by a grant from the National Institute of Mental Health (PO1-MH56826). The authors also thank the field staff of the project who tirelessly sought out participants for these follow-up interviews: Teri Strenski, Jessica Gacki-Smith, Clifton Sanchez and Ruben Gerena in Chicago; Janie Simmons, Kim Koester, Ismael Janie Simmons, Kim Koester, Ismael Nuñez, Rachel Sayko and Susan Fabian in Hartford; Askia Muhammad, Sybil Marcus, Jon Paul Hammond, Jennifer Awa, Daryl Gault, Donny Gann, Jeffrey Moore, Rachel Robinson and Robert Thawley in Oakland. The project is also indebted to the syringe exchanges of the Chicago Recovery Alliance, AIDS Project Hartford, and the Alameda County Exchange for agreeing to refer their syringe exchange clients to the project and to participate in the hepatitis prevention intervention.
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