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

Opportunity Summary:

This funding opportunity (PAR-19-351) is a limited-competition National Institutes of Health (NIH) grant announcement from the National Institute of Allergy and Infectious Diseases (NIAID). It offers an Exploratory and Developmental Research Grant (R21) pathway specifically for investigators who already hold certain NIAID-supported career development awards: K01, K08, or K23. The central purpose is to give these K award recipients a practical bridge to independence by letting them compete for a small, time-limited research award while they are still finishing their mentored career phase. In other words, it is designed to help promising early-stage investigators generate the kind of preliminary data, proof-of-concept results, or refined methods that strengthen a later application for a major independent award such as an R01 (or an equivalent independent research grant).

Eligibility is intentionally narrow on the investigator side: applicants must be NIAID-supported K01/K08/K23 recipients, and the timing matters because the R21 application is meant to be submitted during the final two years of the active K award period. The idea is that, by the time the K support ends, the investigator has already launched an independent line of research or gathered key feasibility data, making the step to an R01 more realistic. This structure also fits NIAID's broader workforce development goals by helping researchers move from mentored training to fully independent investigator status with a concrete funding mechanism that supports early experimentation and rapid testing of ideas.

The R21 mechanism itself is meant for exploratory, developmental, and early-stage research projects that can be completed in a relatively short time and with limited resources. The announcement highlights several common R21-appropriate project types, including pilot and feasibility studies, secondary analysis of existing datasets, small and self-contained projects, and the development or refinement of research methods or technologies. In practice, the expectation is not that the applicant will deliver a fully mature research program, but that the work will reduce uncertainty and provide credible preliminary evidence that justifies a larger, definitive follow-on study or a broader research program supported through an R01 or similar mechanism.

A key restriction in this specific announcement is that clinical trials are not allowed (as stated in the title as "R21 Clinical Trial Not Allowed"). That means applicants need to design projects that stay on the non-clinical-trial side of human research, such as basic, translational, computational, methodological, preclinical, or certain observational or data-focused studies that do not meet NIH's definition of a clinical trial. Anyone considering human subjects work would need to be careful in framing aims and outcomes to ensure the project does not cross into clinical trial territory, because that would make it nonresponsive to the opportunity.

On the organizational side, the eligible applicant landscape is broad and aligns with typical NIH institutional eligibility. Entities that may apply include various levels of U.S. government (state, county, city/township, special district), federally recognized tribal governments, tribal organizations, public housing authorities/Indian housing authorities, independent school districts, public and private institutions of higher education, nonprofit organizations (with or without 501(c)(3) status), for-profit organizations (other than small businesses), and small businesses, as well as an "other" category used in federal listings. The announcement also explicitly calls out a range of institution types that NIH often encourages to apply, including Alaska Native and Native Hawaiian Serving Institutions, Asian American Native American Pacific Islander Serving Institutions (AANAPISISs), 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, and U.S. territories or possessions.

Foreign involvement is clearly restricted. Non-domestic (non-U.S.) entities and non-domestic components of U.S. organizations are not eligible to apply. In addition, foreign components, as NIH defines them in the NIH Grants Policy Statement, are not allowed. This effectively means the applicant organization must be domestic, and the proposed work must be conducted without foreign components as part of the project structure.

In terms of the basic funding profile captured in the listing, the award ceiling is shown as $200,000, and the activity category is health (CFDA 93.855). The opportunity is categorized as discretionary and uses the grant funding instrument. The original closing date in the listing is 2020-09-07, and the opportunity was created on 2019-08-20, which signals that applicants should verify the current status and any subsequent reissues or updated receipt dates if they are searching for an active or successor announcement. Overall, the program is best understood as a targeted stepping-stone: a limited competition R21 that helps NIAID K award recipients produce focused results quickly, strengthen independence, and position themselves for the next major stage of NIH research funding.

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