The timing of the analysis is central to its design. Immigration enforcement activity in Los Angeles County began increasing in early 2025 and then expanded significantly in early June 2025, when high-profile federal operations took place in downtown Los Angeles and other communities. Those operations generated widespread public attention and, according to the researchers, created a natural before-and-after window for studying health care utilization. The team examined patient records at three safety-net hospitals—Los Angeles General Medical Center, Harbor-UCLA Medical Center, and Olive View-UCLA Medical Center—during the twelve months before June 2025 and the four months that followed. These hospitals are a key source of care for immigrant communities in the county, which makes them a sensitive barometer for changes in health-seeking behavior among foreign-born residents.

To distinguish foreign-born patients from U.S.-born patients, the researchers relied on a variable that is routinely collected but rarely exploited for research of this kind: patients’ self-reported country of birth, recorded at the point of care. This allowed the team to compare utilization trends across groups defined by place of birth, including patients born in Mexico, patients born in Central or South America, and patients born in Asia, against a U.S.-born comparison group drawn from the same hospitals over the same period. Because all three facilities serve large, diverse patient populations under the same county health system, the design helps control for hospital-level factors that might otherwise confound comparisons, such as changes in staffing, capacity, or billing practices during the study window.

The headline finding concerns the first four weeks after heightened immigration operations began. During that period, emergency department visits by foreign-born patients decreased by more than 20 percent relative to U.S.-born patients. In other words, after adjusting for the comparison group, roughly one in five emergency visits that would have been expected among foreign-born patients did not occur. This kind of relative decline, measured against a concurrent control population, is methodologically meaningful because it accounts for seasonal patterns, general fluctuations in demand, and any county-wide shocks affecting all patients equally. A drop of that magnitude in a matter of weeks suggests a behavioral response to the enforcement environment rather than a gradual shift in underlying health status.

Over time, the disparity partially receded. By October 2025, the gap in emergency department use between foreign-born and U.S.-born patients had narrowed to 10 percent. The researchers interpret this trajectory as consistent with an acute shock to care-seeking behavior that attenuated as the immediate intensity of enforcement operations subsided, though the gap did not disappear entirely. Even at the reduced level, a persistent 10 percent shortfall in visits among foreign-born patients relative to their U.S.-born counterparts represents a substantial volume of foregone care across a hospital system that serves hundreds of thousands of patients annually. The partial rebound also underscores how sensitive utilization data can be to civic conditions, functioning almost as a real-time indicator of community fear.

Perhaps the most clinically consequential finding is what happened among the foreign-born patients who did seek emergency care. Despite making fewer visits overall, they were more likely to be hospitalized once they arrived. Compared with U.S.-born patients, admission rates increased by 4.8 percentage points among Mexican-born patients, by 5.1 percentage points among patients born in Central or South America, and by 2.5 percentage points among those born in Asia. Higher admission rates among a group that is simultaneously visiting the emergency department less often point toward delayed care: conditions that might have been managed with a short emergency visit and outpatient follow-up instead progressed to the point where inpatient admission became necessary.

This combination of fewer visits and higher admission intensity has a well-understood clinical and economic logic. Emergency departments function as a safety valve for conditions ranging from asthma exacerbations to infections and uncontrolled chronic disease. When patients postpone presentation, illnesses that could have been treated early may advance, requiring longer stays, more intensive interventions, and costlier care. The USC team warns that this dynamic could lead to the development of more serious health conditions and higher costs for both patients and the health care system. For safety-net hospitals, which operate under constrained budgets and serve populations with high rates of uninsurance, an influx of more acutely ill patients carries direct financial and operational consequences, from bed capacity to staffing demands.

The study’s implications extend beyond Los Angeles. Public health researchers have long hypothesized that immigration enforcement can produce a chilling effect on health care use, in which fear of encountering authorities at or near medical facilities deters people from seeking care regardless of their own immigration status. The new findings add rigorous, hospital-level evidence to that literature, quantifying both the magnitude and the duration of the effect during a specific enforcement escalation. Because the analysis covers patients born across multiple world regions, it also suggests that the chilling effect was not confined to a single national-origin group, with measurable declines and admission increases spanning Mexican, Central American, South American, and Asian-born patients, though the magnitude of the admission-rate shift varied by group.

Lead author Sarah Axeen, a scholar at the USC Schaeffer Institute for Public Policy & Government Service and an assistant professor at the Keck School of Medicine of USC, summarized the concern in stark terms. Our findings suggest that immigration enforcement may discourage immigrant patients from seeking acute care when they need it, with potentially serious health consequences for patients and economic costs for the health systems that serve them, she said. That framing captures the dual burden the study documents: a public health cost borne by individual patients whose conditions may worsen untreated, and a systemic cost borne by county hospitals that ultimately absorb more complex, more expensive cases when delayed patients finally present.

The research team included, alongside Axeen, Cameron Kaplan, Daniel Cordova, Manuel Pastor, and Todd Schneberk, all of USC; Annie Ro of the University of California, Irvine; and Anna Gorman of the Los Angeles County Department of Health Services. Data for the work were made available by the National Center for Advancing Translational Sciences of the National Institutes of Health under award number UL1TR001855, and the authors note that the content is solely their responsibility. Published October 5, 2026, in JAMA Network Open under the title Emergency Department Visits After Heightened Immigration Enforcement in Los Angeles County, the study arrives at a moment when policymakers, hospital administrators, and public health officials are weighing how enforcement strategy intersects with community health. Its central message is difficult to ignore: the effects of immigration enforcement are visible not only in arrest statistics and court dockets, but in the quiet, measurable absence of patients from emergency rooms—and in the greater severity of the illnesses they carry when they return.

Subject of Research: The effect of heightened immigration enforcement on emergency department use and hospitalization rates among foreign-born patients at Los Angeles County safety-net hospitals

Article Title: As immigration enforcement increased in L.A., foreign-born patients made fewer ER visits

Article References: As immigration enforcement increased in L.A., foreign-born patients made fewer ER visits. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: immigration enforcement, emergency department visits, foreign-born patients, Los Angeles County, safety-net hospitals, hospitalization rates, JAMA Network Open, health care utilization, chilling effect, public health, USC Schaeffer Center, delayed care

The clearest window into this phenomenon comes from an editor who has seen it firsthand. Alexander C. Tsai of Harvard Medical School and Massachusetts General Hospital, writing in the journal SSM – Mental Health, describes handling a manuscript during review when the author disclosed that the grant supporting the study had been renegotiated. The revised award language was understood to extend its restrictions to publications acknowledging support from the grant. What that meant in practice was anyone’s guess. The author received conflicting advice about how broadly the restriction should be interpreted, including whether it reached the manuscript text itself. Faced with this ambiguity, the author adopted a conservative interpretation and surgically excised the offending terminology from prominent parts of the manuscript, while leaving in place other language that might plausibly have raised similar concerns but had not been specifically flagged.

Tsai argues that his experience is unlikely to be unique, given the scale at which grant award documents have been revised under duress. The proximate cause is not mysterious. Biomedical research funding in the United States has been aggressively politicized. Grants have been terminated mid-cycle for proposing to study topics the administration disfavors. Other grants, spared outright termination, have had their noncompeting continuations slow-walked. The National Institutes of Health has reminded grantees that the force-revised language represents substantive changes in the scope of their awards, and that those changes constitute new terms and conditions with which recipients are expected to comply. Importantly, the NIH notice did not explicitly prohibit particular words from appearing in publications. Instead, it places grantees in the unenviable position of determining how award-specific changes in scope apply to the research activities and scientific products arising from the award.

These executive branch actions unfold within a broader context of attacks on science and academic freedom, compounded by concurrent state-level measures. State legislatures in Indiana, Ohio, and North Dakota, among others, have introduced or passed bills altering post-tenure review procedures, expanding grounds for disciplining or dismissing tenured faculty, restricting institutional diversity, equity, and inclusion programs and expenditures, and imposing politically prescribed requirements on faculty evaluation and teaching. The provisions differ substantially by state, but their conjoint effect has been to deploy a tightly woven dragnet of political oversight over public higher education while weakening the institutional buffers that traditionally protect academic autonomy. Many American scientists now work in environments where tenure protections are eroded, DEI activities are restricted, and the climate for academic freedom is measurably colder.

The result, Tsai writes, is that science now stands in the meat locker of anticipatory compliance. Because the NIH compliance notice does not specifically instruct grantees to eliminate specified terms, but the consequences of noncompliance could be catastrophic for a laboratory, institutional counsel, research management offices, and investigators have strong incentives to adopt conservative interpretations of what the revised terms require. The sanitization takes familiar forms. Terms that have been standard scientific vocabulary for decades—gender-affirming, health equity, justice, racial segregation, sexual and gender minorities, structural racism—closely correspond to terms appearing on screening lists that NIH staff reportedly supplied to Senate staffers and investigative reporters. In manuscripts written under award-specific restrictions, such terms may be replaced with oblique constructions, with older behavioral categories the field has outgrown, or with awkward periphrases whose only virtue is that they do not contain a disfavored word.

The sophistication of this censorship, Tsai argues, is that it requires no censors at all, because scientists can be induced to do the work themselves—in exchange for the continued possibility of maintaining their effort and employing their postdocs. He is careful not to fault individual scientists for making these calculations, acknowledging he would likely do the same. But this is a collective action problem. If manuscript sanitization becomes common, each individually rational act of compliance reveals a degree of elasticity that the administration can then extrapolate to an entire field, and an initially bounded list of keywords that trigger review is unlikely to stop expanding once it has been shown to work. He likens the dynamic to episodes in which major American law firms, targeted by executive orders threatening financial consequences, entered into accommodation agreements that failed to insulate them from further executive pressure. The arrangement, he writes, is elegant: it converts the coercive effects of state action into private editorial decisions, distributes the moral injury across thousands of individual scientists each making a defensible compromise, and leaves executive power free to deny with curious vigor that any censorship is occurring at all.

History suggests how such pressures play out. Three recent episodes offer instructive precedents. The first is the near-total freeze on federal gun violence research at the Centers for Disease Control and Prevention after the National Rifle Association campaigned against the agency’s injury center following a landmark 1993 study linking household firearms to homicide risk. The 1996 Dickey Amendment did not explicitly ban gun violence research, but its language was ambiguous enough to achieve its intended effects. As researchers Arthur Kellermann and Frederick Rivara observed, no federal employee was willing to risk a career or agency funding to find out what was permitted. Publication on gun violence subsequently declined by 64 percent relative to the growth of the indexed literature between 1998 and 2012, and the number of scientists focused on the topic plateaued, trends that did not reverse until the amendment’s meaning was clarified years later. The second episode concerns the Agency for Health Care Policy and Research, which came under organized attack after issuing a clinical guideline favoring conservative treatment of acute back problems; it survived only through a political compromise that cut its budget and ended the guideline program, and its successor agency, AHRQ, now faces renewed existential threats, mass staff reductions exceeding two-thirds of early-2025 levels, website removals of peer-reviewed publications, and a collapse in new grantmaking.

The third precedent may be the closest analogy, because it targeted vocabulary itself. In 2003, then-Representative Patrick Toomey introduced an amendment to rescind funding for five NIH grants studying sexual behavior; it failed by two votes, but NIH Director Elias Zerhouni was subsequently compelled to justify roughly 200 grants on a circulating hit list, many concerning HIV prevention and sexual behavior. No grants were ultimately terminated, yet the chilling effect persisted. When researcher Joan Kempner surveyed affected scientists three years later, half had removed red flag words—gay, lesbian, homophobia, sex workers, needle exchange—from the titles and abstracts of subsequent applications, and a quarter had abandoned entire research topics. NIH-funded research on lesbian, gay, bisexual, and transgender health declined by more than 50 percent in the two years after the failed amendment, and sexual and gender minority health research remains below one percent of the NIH portfolio today. Crucially, those earlier attacks traveled through Congressional processes; the present ones proceed through executive and administrative action, a distinction that gives additional weight to concerns about recovery.

That concern is grounded in a specific asymmetry, one that the history of Soviet biology under Trofim Lysenko illustrates. After Lysenko’s fall, formal genetics research revived with surprising speed, but the accumulated institutional damage did not: no Soviet genetics textbook was published between 1948 and 1963, a generation of biology instructors had been trained in Lysenkoist doctrine, and administrators who rose under his patronage remained in power into the 1970s. Restrictions can be imposed quickly and removed quickly, but rebuilding lost personnel, training pipelines, institutional trust, and scientific trajectories takes considerably longer. Tsai is careful not to over-extrapolate—Soviet scientists were fired, imprisoned, and executed, circumstances plainly different from those in the contemporary United States—but the lesson about institutional inertia stands.

Why does vocabulary matter so much? Because scientific vocabulary is the medium through which the field conveys findings about the pathways by which large-scale forces produce disease. Concepts like institutionalized racism, minority stress, racial segregation, and structural stigma are central to mature literatures on how social conditions shape health. Consider a study measuring gender-based violence—a construct that specifies the gendered relations and structures of power in which violence occurs—and relabeling it in publications as generic interpersonal violence. Readers must reconstruct a critical feature of what was actually studied, and the populations most affected lose the precision of the finding. Tsai canvasses the coping strategies available to authors, from awkward periphrases to coded substitutions—his satirical suggestion of replacing structural racism with pink polka dotted bananas exposes the absurdity of purely lexical enforcement, which would not even defeat automated semantic screening—and portfolio segregation, in which investigators with non-federal funding allocate their most vocabulary-vulnerable work to genuinely non-federal support. None of these strategies will preserve scientific communication against a determined state adversary, but they make the pressures visible rather than subsidizing them invisibly. The deeper remedy, he argues, is collective: editorial statements, professional society position papers, and coordinated commentary that turn isolated, private accommodations into a documented collective act performed under duress. Scientists, he insists, deserve to have their compliance recorded accurately as compliance rather than as consent.

Subject of Research: Anticipatory self-censorship among U.S. biomedical scientists under federal funding and political pressure on scientific vocabulary

Article Title: Inside the meat locker: anticipatory self-censorship and pressure on the vocabulary of American science

Article References: Tsai, A. C. (2026). Inside the meat locker: anticipatory self-censorship and pressure on the vocabulary of American science. SSM – Mental Health, 10, Article 100696. https://doi.org/10.1016/j.ssmmh.2026.100696

Image Credits: AI Generated

DOI: 10.1016/j.ssmmh.2026.100696

Keywords: self-censorship, NIH, scientific censorship, academic freedom, federal grant terminations, chilling effect, research funding, public health, structural racism, AHRQ, Dickey Amendment, Lysenkoism