Findings

Introduction

Vietnam reported in 1991 the first case of human immunodeficiency virus (HIV) infection; 25 years later, 227,114 people were living with HIV and 74,442 people had died of AIDS [1]. The epidemic has been slowed down in recent years from the annual new infections of over 30,000 in 2006–2007, but there were still 12,500 people newly diagnosed in 2013 [2].

The HIV epidemic in Vietnam was triggered and driven by drug injection. In the early 1990s, the annual proportion of newly diagnosed HIV cases among people who inject drugs (PWID) was as high as 87 % [3]. By the early 2000s, HIV prevalence among injecting drug users in Vietnam peaked at around 30 % before slowly and steadily reducing to around 10 % in 2014 as harm reduction was introduced and scaled up [4].

Women who inject drugs (WWID) tend to progress faster than males to dependence; inject more frequently; have intimate partners who inject, acquire and die from HIV/AIDS; and have greater combined risks, partly because many sell sex to purchase drugs [5–8]. Stigma may be greater than towards men who inject drugs (MWID) because ‘injecting drug use is often seen as contrary to the socially derived roles of women as mothers, partners and caretakers’ ([9], p. 19). Epidemic data shows that the share of drug injection as a mode of transmission has been reduced significantly from over 80 % in the 1990s to 35.4 % in the first 6 months of 2015 [4]. This indicates the ongoing significance of drug injection but also the increasing importance of sexual transmission. In such context, WWID as an HIV ‘bridge’ through cross-over of injecting and sex work (SW) is of epidemiological importance where commercial sex and inconsistent condom use are prevalent [10–15]. There is a dearth of research on WWID and of interventions that encompass drug use and wider health needs [7].

Little is known about characteristics, usage patterns, extent of sex work and HIV risks among WWID in Vietnam. Sentinel surveillance among PWID excludes females; most data on WWID is about SWs who inject [5, 12, 16, 17]. This paper reports descriptive findings from a cross-sectional survey, aimed to inform policy makers and programme managers about characteristics of WWID in the two major cities of Vietnam and their HIV-related behaviours so that policies and programmes can be adapted to produce stronger impacts on the HIV epidemic in Vietnam. The research, conducted in Hanoi and Ho Chi Minh city in 2010–2011, was funded through an Australian Development Research Award.

Methods

An advisory group—consisted of representatives of WWID, HIV programme managers and public security officials—was set up to guide the study. Per advice of the group, participants were recruited from Hanoi and Ho Chi Minh city—the two largest cities with the highest numbers of people who inject drugs and also the highest concentration of WWID.

Women aged 18+ who injected at least once in the previous 6 months were recruited using respondent-driven sampling (RDS) [15, 17–19]. The sample size of 200/site was based on the assumed prevalence of 50 % for key responses (which would yield the biggest sample size), 95 % confidence interval, 8.5 % margin of error and design effect of 1.5. In each city, the recruitment started with nine ‘seeds’, balanced between age groups, HIV status and sex work involvement. Each participant was given three coupons to recruit others. Data collection was done at a drug user organisation’s office. Core members of the organisations provided information about the study; screened potential participants for eligibility, especially by checking injection marks and asked questions about injection practice; and monitored recruitment to avoid repeated participation. Interviewers were social researchers experienced in and comfortable with interacting with WWID. Participants got compensation of 150,000 Vietnam dongs (around 8 US dollars) for their contribution. In total, 203 WWID in Hanoi and 200 in Ho Chi Minh City (HCMC) participated.

Data were entered analysed by RDSAT v 6 [15] except constructing means (used SPSS v18). Approval was given by University of Melbourne’s Human Research Ethics Committee and the Hanoi investigator’s institutional review board.

Results and discussion

Characteristics

Mean age of WWID in Hanoi was 32.8 (18–54) years while in HCMC was 27.3 (18–35). Hanoian WWID on average had 7.9 (0–12) years of education and HCMCs had an average of 6.7 (0–13). SW was a main income source for almost two thirds in Hanoi but <30 % in HCMC. HCMC had more unemployed (Table 1). Nearly two thirds in Hanoi and 44 % in HCMC had ever married; similar proportions had children. Most did not live with a partner, and most partners used drugs. Most common accommodation in Hanoi was self-rented, and in HCMC was with family, but 10 % were homeless in HCMC (3 % in Hanoi).

Table 1 Sample characteristics
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Knowledge and testing

Knowledge about HIV transmission through tattoos and breastfeeding was inadequate, and one fifth in Hanoi and 40 % in HCMC believed they could identify an infected person by appearance. (Table 2) In HCMC, 29 % had not heard of sexually transmitted infections (STIs). Although viral hepatitis is a scourge among PWID [16], 82 % (Hanoi) and 70 % (HCMC) had never heard of Hep C, and <60 % knew of Hep B. Over one third knew nothing about HIV treatment. Among the 81 % (Hanoi) and 65 % (HCMC) ever tested for HIV, 35 % (Hanoi) and 40 % (HCMC) were untested for >1 year.

Table 2 HIV knowledge and testing
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Gender and perceived stigma

Our sample perceived WWID (especially) and SWs as intensely stigmatised. The vast majority felt drug use or selling sex inhibited finding a non-injecting partner (Table 3).

Table 3 Perceived community attitudes towards injecting drugs and sex work
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Injection and sexual risks

Entry into drugs and sex was varied. More than 70 % of our sample cited friends, and less than one quarter cited husband/boyfriend, as those who introduced them to drugs (Table 4). Almost all started with heroin, mostly smoked/inhaled apart from 26.7 % (CI 18.6–35.5) in Hanoi and 13.5 % (CI 7.1–21.2) in HCMC who commenced with injecting. Similar reasons were offered but different proportions; for example, ‘forget sorrow’ was most common in Hanoi and ‘curiosity’ in the younger HCMC sample (Fig. 1). Mean age of first use was 24 (13–47) in Hanoi and 19.8 (11–33) in HCMC. Around 28 % in Hanoi and 62 % in HCMC used by age 20, and 0.5 % and 12 % were under 16, respectively; HCMC’s younger profile suggests initiation is starting earlier.

Table 4 Injecting behaviour by site
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Fig. 1
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Reasons given (%) for starting to use drugs (>1 response acceptable)

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Around one fifth of our participants in both cities reported injecting at least four times a day: 19 % Hanoi, 21.5 % HCMC. Women primarily injected alone, most often in their homes (Hanoi 87 %, HCMC 50 %), guesthouses in Hanoi, streets/parks in HCMC and public toilets in both. Needle sharing in the previous month was 8.3 % in Hanoi and 18.4 % in HCMC. Reasons for sharing (>1 permitted) were craving, convenient and to express love/trust or share fate.

Mean age at first intercourse was 18.4 years (8–30) in Hanoi, 17.9 years (11–28) in HCMC, but some reportedly had sex as children (Table 5). In HCMC, 24 % had sex before age 16 (4 % in Hanoi).

Table 5 Sexual practices
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Over one fifth in Hanoi and nearly half in HCMC reported they had never sold sex. Among those who had, two thirds were using drugs before they first sold sex (Fig. 2).

Fig. 2
figure 2

Sequence of using drugs, selling sex (among those who had sold sex) (%) (Hanoi n = 158, HCMC n = 106)

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Some sold sex as children. Mean age of first SW was 25 (14–52) in Hanoi and 20 (13–33) in HCMC, where almost 20 % sold sex before age 17 (3.3 % in Hanoi). Substantial minorities sold sex to buy drugs for partners. Over one third claimed SW was their decision. In Hanoi, 85 % (81.3–90.9), and HCMC, 72 % (63.3–79.6), had sex in the past month; mean number of partners was 44 (1–180) in Hanoi, 12 (1–100) in HCMC. Clients were found mainly in public places, rather than brothels or bars.

Condom use was high with clients. However, 76 % of sexually active women in Hanoi and 83 % in HCMC had ≥1 ‘husband/boyfriend’, many/most of whom used drugs; just 17.5 % in Hanoi and 32 % in HCMC used condoms the last time.

Limitations

Reporting of certain behaviours may be influenced by recall and social desirability bias. RDS recruits through peer networks; hence, some types of WWID, e.g. those who rarely interact with others, may not be sampled. Fears of facing the police (for doing sex work or using drugs) might have prevented some WWID to participate. Also, lack of a known sampling frame precludes certainty about generalisability.

Discussion

Participants’ demographic data reflects the diversity of WWID (age range, socio-economic status, living arrangement, etc.), and the North–South differences imply different strategies are needed to reach and to deliver interventions to them.

However, common issues (and needs) of WWID were identified through the study: being single mothers, had sex or sold sex as a child, heavily dependent on drugs with a high frequency of injection, not using condom with intimate partners–multiple of them–most/all injectors with high probability of having HIV, inadequate knowledge on HIV transmission, suboptimal access to HIV testing, lacking knowledge on STI and viral hepatitis and high perceived stigma from society. Programmes to prevent blood-borne infections should be intensified among WWID. Psychological support, counselling, family planning and parenting skills are among interventions needed to address their different immediate needs.

From these WWID, we learn that drug use led some of them to sex work. Drug-dependent treatment would be an important intervention strategy to prevent this. But we also learn that not all WWID sell sex, so programmes targeting sex workers would not reach many of the WWID.

Given the epidemiological context in Vietnam where injection still plays an important role while sexual transmission is gradually becoming the most important mode of transmission, intervention for bridging groups such as WWID should be prioritised if the HIV epidemic in Vietnam is to be stopped.