Limited Competition: Exploratory and Developmental Research Grant Program for NIAID K01/K08/K23 Recipients (R21 Clinical Trial Not Allowed) | PAR 20 291

Opportunity Information: Apply for PAR 20 291

This funding opportunity (PAR-20-291) is a limited-competition NIH grant announcement from the National Institute of Allergy and Infectious Diseases (NIAID) that lets certain NIAID career development awardees take an extra step toward independence by applying for an Exploratory and Developmental Research Grant (R21). It is specifically designed for investigators who already hold an NIAID-supported K01, K08, or K23 and are in the final two years of their K award. The core purpose is to strengthen these early-career scientists as they move from mentored career development into fully independent research roles, with the long-term expectation that the R21-supported work will help position them for larger independent grants such as an R01 (or another equivalent major research award).

The mechanism being used is the NIH R21, which is meant for early-stage, exploratory, and developmental projects rather than large, mature research programs. In practical terms, this program supports work that can be completed as a focused project and that often carries more scientific risk or uncertainty than an R01 would typically tolerate, precisely because it is aimed at generating initial signals and proof-of-concept results. NIAID highlights several common R21 use cases: pilot and feasibility studies, secondary analyses of existing datasets, small and self-contained research efforts, development or refinement of research methodologies, and development of new research technologies. The throughline across these examples is that the R21 should generate credible preliminary data, prototypes, or validated methods that can support a stronger follow-on application for a larger grant.

A key constraint is embedded directly in the title: "Clinical Trial Not Allowed." That means applications proposing clinical trials are not permitted under this particular R21 opportunity. While clinical research can sometimes be supported through other NIH mechanisms, this announcement is aimed at exploratory work that does not involve running a clinical trial, which narrows the kinds of human-subjects research that would fit and pushes applicants toward preclinical, mechanistic, methodological, or non-trial clinical research activities such as analysis of existing clinical data (as long as it stays within NIH definitions and policies and does not become an intervention trial).

Eligibility is broad at the organizational level but narrow at the investigator level. On the applicant organization side, eligible applicants include a wide range of U.S. entities: state, county, and local governments; special district governments; independent school districts; public and state-controlled institutions of higher education; private institutions of higher education; federally recognized Native American tribal governments; public housing authorities and Indian housing authorities; Native American tribal organizations that are not federally recognized tribal governments; nonprofits with and without 501(c)(3) status (excluding institutions of higher education when specified); for-profit organizations other than small businesses; and small businesses. The announcement also explicitly calls out categories of organizations that are eligible, including Alaska Native and Native Hawaiian Serving Institutions, Asian American Native American Pacific Islander Serving Institutions (AANAPISIs), Hispanic-serving Institutions, Historically Black Colleges and Universities (HBCUs), Tribally Controlled Colleges and Universities (TCCUs), faith-based or community-based organizations, eligible federal agencies, regional organizations, tribal governments that are not federally recognized, and U.S. territories or possessions.

At the same time, the opportunity places strict limits on foreign involvement. Non-domestic (non-U.S.) entities and foreign institutions are not eligible to apply, non-domestic components of U.S. organizations are not eligible to apply, and foreign components (as defined in the NIH Grants Policy Statement) are not allowed. In other words, the applicant organization and the supported work must remain domestic under NIH rules, without foreign components included in the project structure.

From the funding details provided, the award ceiling is listed as $200,000, which signals that this is a relatively modest, targeted budget consistent with the R21 goal of supporting exploratory work rather than full-scale programs. The listing identifies the opportunity as a discretionary grant in the health funding activity category and references CFDA number 93.855 (a catalog identifier historically associated with NIAID programs). The original closing date shown is 2023-09-07, with a creation date of 2020-09-14, which helps place the announcement in time and suggests that applicants would need to verify current submission windows or reissuances if they are planning to apply now.

Overall, the program is best understood as a bridge: it gives NIAID K01/K08/K23 awardees a structured, limited-competition chance to secure R21 funding near the end of their mentored period so they can produce the kind of preliminary data, methodological advances, or feasibility evidence that makes a subsequent independent application (most commonly an R01) more competitive, while explicitly avoiding the complexity and regulatory scope of conducting a clinical trial under this announcement.

• The National Institutes of Health in the health sector is offering a public funding opportunity titled "Limited Competition: Exploratory and Developmental Research Grant Program for NIAID K01/K08/K23 Recipients (R21 Clinical Trial Not Allowed)" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.855.
• This funding opportunity was created on 2020-09-14.
• Applicants must submit their applications by 2023-09-07. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Each selected applicant is eligible to receive up to $200,000.00 in funding.
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

Apply for PAR 20 291

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