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IAS 2015: Indiana HIV Outbreak -- Lessons about Containing Local Outbreaks and Harm Reduction

An early 2015 outbreak of HIV and hepatitis C virus (HCV) infection in rural Indiana linked to injection of prescription opiates offers a good example to how to track and contain a localized outbreak, according to a pair of presentations at a late-breaking prevention research session at the 8th International AIDS Society Conference on HIV Pathogenesis, Treatment, and Prevention last month in Vancouver. Attendees at the session stressed that we already know how to prevent such outbreaks, and called for implementation of needle exchange programs and other proven-effective harm reduction measures.

In January 2015 the Indiana State Department of Health, later joined by the U.S. Centers for Disease Control and Prevention (CDC), began investigating an HIV outbreak after disease intervention specialists confirmed nearly a dozen new infections in a rural community in Scott County, near the Kentucky border -- a community of 4200 residents that had only reported 5 cases of HIV during the previous decade. Investigators traced the new infections to people who inject oxymorphone (brand name Opana), a prescription opioid or opiate-like painkiller.

The CDC issued an official health advisory about the outbreak in April, and CDC and Indiana investigators published a brief report in the May 1 edition of Morbidity and Mortality Weekly Report.

John Brooks, leader of the CDC's HIV Epidemiology Team, described efforts to determine the source of the Indiana outbreak, trace patterns of transmission, halt further infections, and bring affected people into care. He also presented results from a molecular epidemiology analysis of HIV and HCV strains, providing insight into how the viruses spread.

Brooks said a disease intervention specialist first recognized that 2 people newly diagnosed with HIV had shared needles for drug injection; contact tracing soon identified 8 more cases. Health officials interviewed newly diagnosed individuals, asking about their needle-sharing behavior and injection and sex partners. People were given the opportunity to suggest any social contacts they thought "might benefit from an HIV test" without naming them as sex or dug use partners. All named individuals who could be located were offered HIV, HCV, hepatitis B virus, and syphilis testing.

Investigators identified nearly 500 individuals during contact tracing, 83% of whom were located, assessed for risk, and tested for HIV. As of June 14, a total of 170 people were diagnosed with HIV. After a rapid increase in mid-March and April, the outbreak plateaued. "We could tell we were closing in on the epidemic when no contacts named were new," Brooks said.

More than half (55%) of the newly diagnosed individuals were men, all were non-Hispanic white, and the median age was 32 years (range 19-56 years). Among those who tested HIV-positive, about 40% reported needle-sharing as their only risk factor, 1% reported only sexual risk, another 40% reported both needle-sharing and sexual risk, and nearly 20% had unknown risk factors, according to the study abstract.

Almost all newly diagnosed people (96%) reported injection drug use. They described crushing, dissolving, and heating extended-release oxymorphone, and some used methamphetamine and heroin as well. The reported daily number of injections ranged from 4 to 15, and the number of injection partners ranged from 1 to 6 per injection event. Interview participants reported that injection drug use in this community is often multi-generational, and family and community members frequently inject together and share syringes and other equipment. The Indiana outbreak reflects a recent upsurge in non-urban injection drug use in the U.S. that has led to increases in HIV and HCV infection and overdose deaths.

Some features of this outbreak differ from those of other outbreaks previously seen among people who inject drugs in the U.S., according to Brooks. The newly diagnosed population was rural, all white, and nearly evenly split between men and women. In contrast, prior outbeaks have traditionally involved inner-city residents, often African-American or Latino, with a 2-to-1 ratio of men to women. But other factors of the Indiana outbreak were similar, including a high rate of poverty (19%), unemployment (9%), low education level (21% without a high school diploma), and limited access to insurance and health care.

Genetic analysis of HIV pol and HCV NS5B gene sequences from plasma samples collected from residents of Scott County and surrounding areas between October 2014 and April 2015 showed that HIV strains were closely related, while HCV strains were more diverse. Usually this type of testing is done retroactively, Brooks noted, adding that he thought this was one of first times real-time phylogenetic data had been used to inform response to an ongoing outbreak, letting investigators know early on that it was geographically isolated.

There was 1 large cluster of related HIV-1 subtype B strains (comprising 55 of 57 tested samples), along with a second very small cluster that Brooks said may represent pre-existing undiagnosed infections. Avidity testing showed that more than 90% of the HIV infections were recent. Phylogenetic trees for HCV were quite different; although 3 viral clusters were apparent, the "vast majority" of HCV strains did not fall into any of them. Among the 119 samples tested, the most common HCV genotypes were 1a (n=82) and 3a (n=29). Almost all people (>95%) diagnosed with HIV were coinfected with HCV, while about one-third of samples from people with HCV showed HIV coinfection.

Brooks explained that this picture is consistent with HIV newly arriving in a community with a high prevalence of pre-existing HCV of many different types.

Response to the Outbreak

Brooks described the "enormous challenges" facing the affected population. Many were unemployed, most were uninsured, and many did not have identifying documents such as birth certificates. The county is an "abstinence-only" jurisdiction that does not teach comprehensive sex education in schools. Medication-assisted or opiate substitution therapy for addiction treatment was not locally available. The community's sole family practitioner saw outpatients just 4 hours per week, and most people who received care for HIV or hepatitis C traveled out of town to do so.

In response to the outbreak, health officials set up a "one-stop shop," accessible by foot, where people could access multiple services including care coordination, vaccines, help obtaining documents, job training, and assistance signing up for Medicaid. Fortunately, Indiana had recently extended its Medicaid program under the Affordable Care Act -- which 20 other states have still failed to do.

The state increased funding to expand capacity for HIV testing, care, pre-exposure prophylaxis (PrEP), and medication-assisted addiction treatment. Brooks said that about 70% of newly diagnosed people had entered HIV care, about 40% started antiretroviral therapy, and all of these achieved viral suppression or substantial viral load decreases. The first 10 people who started PrEP were sex partners of people who inject drugs, and more and more drug injectors have been asking about PrEP. HCV treatment has proven more challenging due to multiple barriers including the high cost of new drugs, but Brooks noted there has been "a lot of interest" from providers in learning about hepatitis C care.

In the wake of the outbreak public health officials started a media campaign and sent out a mailer to all county residents about HIV and hepatitis testing. Billboards and bus shelter ads encouraged people not to share needles. Jeanne Hale, the mother of Ryan White -- the Indiana teenager who became a public face of AIDS in the 1980s -- came to help educate and dispel stigma.

Summarizing measures to control the outbreak, Brooks highlighted antiretroviral treatment for everyone with HIV; expanded testing including at jails, emergency rooms and addiction services; efforts to decrease opioid over-prescribing; and "long-term solutions to improve public health infrastructure and socioeconomic disparities and to reduce stigma."

On March 26 Indiana governor Mike Pence declared a public health emergency, which allowed implementation of needle exchange programs. In April a new law allowed lay people (not medical providers) to administer naloxone (Narcan) to prevent opiate overdose deaths.

Prior to the outbreak needle exchange was illegal in Indiana, as it still is in many states (not surprisingly, overlapping substantially with those that have not expanded Medicaid). Many newly diagnosed individuals spent time in jail, with syringe possession being the leading reason. At the national level, there is still a ban on using federal funds for needle exchange. (The Obama administration lifted the long-standing ban in 2009, but Congress reinstated it in 2011).

"It is past time for the federal ban on funding for syringe exchange to end," said

session co-chair Steffanie Strathdee from the University of California at San Diego. "It's a travesty -- we all know how to prevent this. We need to stop waiting until epidemics occur." (Strathdee and IAS 2015 co-chair Chris Beyrer from Johns Hopkins published an editorial on the Indiana outbreak and needle exchange in the July 30 New England Journal of Medicine.)

"This is déjà vu," concurred Michael O'Shaughnessy, founding director of the British Columbia Centre for Excellence in HIV/AIDS who spearheaded efforts to stem the HIV epidemic among injection drug users in Vancouver in the 1990s. Outbreaks like the one in Indiana are "entirely preventable," he added. "We need to get the politicians to smarten up -- they're responsible for these infections."

8/5/15

References

J Duwve, K Hoover, C Conrad, J Brooks, et al. Community outbreak of HIV infection linked to injection drug use of oxymorphone -- Indiana, 2015. 8th International AIDS Society Conference on HIV Pathogenesis, Treatment, and Prevention. Vancouver, July 19-22, 2015. Abstract MOAC0303LB.

RR Galang, J Gentry, PJ Peters, J Brooks, et al. HIV-1 and HCV molecular epidemiology of a large community outbreak of HIV-1 infection linked to injection drug use of oxymorphone -- Indiana, 2015. 8th International AIDS Society Conference on HIV Pathogenesis, Treatment, and Prevention. Vancouver, July 19-22, 2015. Abstract MOAC0304LB.

C Conrad, HM Bradley, D Broz, JM Duwve, et al. Community Outbreak of HIV Infection Linked to Injection Drug Use of Oxymorphone -- Indiana, 2015. Morbidity and Mortality Weekly Report 64(16):443-444. May 1, 2015.

CDC Health Alert Network. Outbreak of Recent HIV and HCV Infections among Persons Who Inject Drugs. CDC Health Advisory. April 24, 2015.

SA Strathdee and C Beyrer. Threading the Needle -- How to Stop the HIV Outbreak in Rural Indiana. New England Journal of Medicine 373(5):397-399. July 30, 2015.