PxWire Volume 15, Issue 4

This issue provides a range of maps to help orient the field on critical HIV prevention activities: the status of delivering injectable cabotegravir (CAB for PrEP); funders and countries on track for early introduction of injectable lenacapavir (LEN for PrEP); and where new Phase 3 efficacy trials testing MK-8527 as a monthly pill for PrEP are taking place.

Read below or download a PDF version of this issue.

Progress in PrEP Uptake

  • The first supplies of CAB for programmatic use (as opposed to use in implementation studies) began to arrive in countries in 2024.
  • Currently, 16 countries are rolling out CAB for programmatic use, with the majority of supply provided by PEPFAR, and some additional quantities procured by the Global Fund.
  • Stop work orders for PEPFAR programming, issued in January 2025 by the new US administration, led to the cancellation of planned programs to offer CAB before they could start in Namibia and South Africa. Ethiopia’s CAB program was able to move forward with supplies supported by Global Fund.
  • Stop work orders disrupted ongoing CAB programs in other PEPFAR supported countries, too. They were able to resume, though in some cases at a reduced level. Global Fund supported programs were unaffected by stop work orders and are ongoing.
  • The future of PEPFAR and Global Fund supported CAB programs remains uncertain in the context of multiple forms of injectable PrEP entering the market. But lessons and insights being gathered now on delivery of injectable PrEP via these programs can be leveraged to help countries prepare for the introduction of LEN.
  • In the past quarter, CAB for PrEP received additional regulatory approval in Argentina, Chile, Mexico, and Rwanda.

PrEParing for New Products

The Latest R&D in the Prevention Pipeline

  • Seventeen countries are hosting sites for the Phase 3 efficacy trials of a monthly PrEP pill, MK-8527, being developed by Merck (also known as MSD outside of the US and Canada). Merck announced the launch of the Phase 3 trials at IAS 2025 in Kigali. MK-8527 was found to be safe and well-tolerated in Phase 2 clinical trials.
  • A long-acting PrEP pill would offer a unique new option to the existing range of PrEP options and could significantly expand use of HIV prevention, especially among young women, key populations, those facing stigma or access barriers, and those that prefer an oral PrEP option over an injectable.
  • EXPrESSIVE-10, with funding from the Gates Foundation, is expected to launch in Q4. It will enroll about 4,600 cisgender adolescent girls, young women, and other women who could benefit from PrEP across three countries in Eastern and Southern Africa.
  • EXPrESSIVE-11 launched in August 2025, and will enroll about 4,400 cisgender men, MSM, transgender men and women, and gender non-binary persons who could benefit from PrEP in 16 countries. So far, EXPrESSIVE-11 has launched at sites in Dominican Republic, Guatemala, Switzerland, and the US.
  • Merck’s commitment to stakeholder engagement to date contributes an important model of Good Participatory Practice (GPP) to the field, by putting global advocates at the forefront of planning for the program and trial design. Merck has expressed a commitment to sustain this vital engagement throughout the program and next steps.

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EXPrESSIVE Phase 3 Trials Countries of MK-8527

Seventeen countries are hosting sites for the Phase 3 efficacy trials of a monthly PrEP pill, MK-8527, being developed by Merck (also known as MSD outside of the US and Canada). Merck announced the launch of the Phase 3 trials at IAS 2025 in Kigali. MK-8527 was found to be safe and well-tolerated in Phase 2 clinical trials.

This graphic appears in PxWire.

Avac Event

Beyond Borders

Join ISSTDR, IUSTI, the STI & HIV 2025 World Congress, and AVAC for a special webinar spotlighting speakers who were not about to join the congress due to financial and political barriers. Presenters will share their findings, debate their results, and discuss the work still ahead for the STI field. Don’t miss this opportunity to engage directly with cutting-edge research and the people driving it forward.

Cabotegravir Implementation

Implementation studies completed, ongoing, or planned for cabotegravir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.

Dapivirine Vaginal Ring Implementation

Ongoing and planned implementation studies for the dapivirine vaginal ring as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.

Cabotegravir Volume

Allocation of non-commercial cabotegravir for PrEP supply in low- and middle-income countries, 2023-2026, as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.

Dapivirine Vaginal Ring Volume

DVR supply available to low- and middle-income countries as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.

Cabotegravir Regulatory Approval

Regulatory approvals and those pending for cabotegravir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.

Dapivirine Vaginal Ring Regulatory Approval

Regulatory approvals, pending decisions, and appeals as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.

Global Health Watch: US government shuts down, foreign aid funding expires, Jeanne Marrazzo fired from NIH, issue 36

The US government shutdown that began at midnight on October 1 has stalled key public health operations just as the Supreme Court issued a ruling in AVAC v. Department of State that allowed $4 billion dollars in foreign aid to expire, eroding both health and human services and constitutional checks and balances. Meanwhile, Jeanne Marrazzo was officially fired as Director of NIAID, underscoring how politically motivated attacks on science are dismantling the infrastructure that has underpinned decades of progress in HIV prevention and research. 

US Government Shuts Down as Federal Funding Expires

At midnight on October 1, US federal funding expired and a government shutdown began after Congress failed to agree to pass a Fiscal Year 2026 (FY26) budget or even a temporary continuing resolution. The shutdown is largely rooted in disagreements over healthcare policy, especially access to healthcare coverage under the Affordable Care Act and Medicaid. The shutdown means “nonessential” federal work is stopped, including many public health operations. Approximately 750,000 federal employees are furloughed, including 40% of Health and Human Services (HHS) staff. CDC disease surveillance is disrupted, many NIH clinical trials are on hold, as is NIH grantmaking and basic research. Many PEPFAR staff have been furloughed as well, but essential “lifesaving” work is continuing. 

IMPLICATIONS: The shutdown further destabilizes the US health system and public health infrastructure already weakened by deep cuts. It now comes against the backdrop of a Presidential administration that is using official federal agency websites and social media as propaganda to blame Democrats for the crisis, while the Office of Management and Budget (OMB) director openly threatens mass firings across federal agencies, which is part of the Project 2025 vision he led. For the global health field, the situation highlights how fragile US commitments have become, with billions in foreign aid still frozen and HIV research and prevention programs facing uncertainty. Beyond the immediate loss of services, intimidation tactics on display during this crisis threaten to erode trust and stall science, which will extend beyond the US with consequences for health and human services worldwide. 

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US Supreme Court Grants Administration Request to Keep Foreign Aid Frozen as Clock Runs Out 

Just prior to the US government shutdown, the US Supreme Court (SCOTUS) handed down a decision in AVAC v. Department of State and Global Health Council v. Trump cases, challenging the foreign aid freeze. In a 6-3 decision by emergency order, the court granted the Administration’s request to not spend $4 billion of Congressionally appropriated foreign assistance funds before they expired on September 30, as required by law. This means that, despite the law, and a lower court order, those funds remain unspent. In its statement, AVAC’s Executive Director, Mitchell Warren, warned that the ruling gave the Administration a “free pass” to block disbursement of foreign aid, citing devastation with clinic closures, disruptions in essential services, and lives lost. Moreover, Warren said the ruling undermines constitutional checks on presidential power. “This is beyond foreign assistance; the Court’s decision is a chilling one for anyone who cares about the US Constitution.” In a dissent from the three other Justices, Justice Kagan cautioned that the stakes are too consequential to be decided through emergency orders without full briefing and oral argument and argued that the Administration has not met the stringent standards for such relief. 

IMPLICATIONS: While the SCOTUS ruling is not a final judgment, it signals a willingness to allow the President and the Executive branch to withhold funds that Congress has appropriated, potentially whenever it chooses. If unchecked, this precedent could erode the checks and balances that constrain executive overreach and jeopardize not only global health funding but every area of federal spending. 

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Jeanne Marrazzo Fired from NIAID 

Jeanne Marrazzo, former Director of the National Institute of Allergy and Infectious Diseases (NIAID), was terminated on October 1 by Health and Human Services (HHS) Secretary Robert F. Kennedy Jr. after being placed on administrative leave in April. This comes 22 days after Marrazzo and former Fogarty International Center’s director, Kathy Neuzil, filed a whistleblower complaint with the Office of Special Counsel. In her complaint, Marrazzo detailed the Administration’s unlawful cancellation of critical research grants, politicization of science, hostility toward vaccines, and censorship of research. Marrazzo’s lawyers claim that her firing was an act of clear retaliation for her defense of scientific integrity and public health research. Marrazzo succeeded Anthony Fauci as the director of the NIAID in 2023. 

IMPLICATIONS: The Office of Special Counsel has been severely weakened by the Administration as have other oversight mechanisms- leaving few pathways for federal scientists and other federal employees to resist politically motivated attacks on research. Holding federal offices accountable to standards of practice that protect the scientific enterprise from political and ideological gamesmanship is essential. Without those standards enforced, decades of progress in science and research are at risk. Marrazzo’s dismissal represents another blow to the independence of US science agencies.  

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FOLLOWING: The US May Expand Mexico City Policy / Global Gag Rule 

According to the Daily Signal, the US Department of State plans to extend the scope of the Global Gag Rule (often referred to as the Mexico City Policy), which is an executive order that restricts foreign non-governmental organizations (NGOs) from receiving US global health assistance if they provide, refer, or advocate for abortion services. The Global Gag Rule first enacted by the Reagan administration, has been rescinded by every Democratic president and put back in place under every Republican president. Reportedly, the language in this latest iteration of the policy would be expanded to also ban US funding for foreign assistance that promotes “gender ideology” or DEI initiatives. The inclusion of gender affirming care and DEI continues this Administration’s ongoing mischaracterization of existing foreign assistance programs, and attacks on programs that are trans inclusive or seek to address racial and gender disparities.  

IMPLICATIONS: This expansion of the Global Gag Rule would fulfill a long-standing conservative goal, explicitly named in Project 2025, to reshape US global public health funding away from evidence-based programs that affirm the needs and dignity of sexual and gender minorities. Turning away from these vulnerable populations further threatens and sets back progress towards ending the global HIV epidemic.   

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