PLOS Pathogens’ Journal Impact Factor (JIF)

PLOS Pathogens’ Journal Impact Factor (JIF) is a specific instance of the general Journal Impact Factor metric published annually by Clarivate in the Journal Citation Reports (JCR) — but PLOS itself, as a matter of explicit editorial policy, does not promote or display a current JIF figure for its journals, including PLOS Pathogens. That policy is more useful and more citable for a research-administration audience than any individual tracker’s number.

PLOS’s own policy: it does not promote an Impact Factor

PLOS’s journal-information page states directly: “We do not consider Impact Factor to be a reliable or useful metric to assess the performance of individual articles but will provide the metric to individuals when specifically requested.” CASRAI verified this language directly on journals.plos.org’s journal-information page (last verified 16 August 2026); the same boilerplate policy language appears across PLOS’s journal-information pages, including PLOS Pathogens’. Rather than headlining a JIF, PLOS’s own metrics pages promote article-level metrics (ALMs), Scopus’s CiteScore and SJR, and the author-level h-index. This position is consistent with the stance of DORA (the San Francisco Declaration on Research Assessment) and the CoARA coalition, both of which discourage using a single journal-level citation ratio as a stand-in for the quality of an individual article or researcher — PLOS is a DORA signatory and its metrics-page language reflects that commitment in practice.

What that means for citing a number

Because PLOS itself declines to headline a JIF, any specific figure in circulation for PLOS Pathogens is necessarily coming from a third party — most commonly Clarivate’s own Journal Citation Reports (JCR), which does compute and publish a JIF for PLOS Pathogens as a JCR-indexed title even though PLOS does not foreground that number on its own site. Clarivate’s JCR database itself sits behind institutional-subscription authentication and could not be checked directly by CASRAI. If a specific figure is genuinely needed — for a CV, grant narrative, or tenure file — the reliable path is: (1) check whether your institution has JCR access via a library subscription and look up PLOS Pathogens directly in jcr.clarivate.com, current cycle the 2025 data year, released June 2026; or (2) per PLOS’s own stated policy above, request the figure directly from PLOS. Do not substitute a number quoted by a third-party JCR-tracking aggregator or Wikipedia’s infobox for either of those — aggregators update on their own schedules and can diverge from Clarivate’s actual current release.

What the JIF measures, mechanically, when it does exist

Where a journal does carry a Clarivate JIF, the figure is a ratio: citations received in a given year to citable items (articles and reviews) the journal published in the two preceding years, divided by the number of those citable items. PLOS Pathogens launched in September 2005 as a subject-specific PLOS title restricted to research on pathogens and host-pathogen interaction, published by the Public Library of Science (PLOS), and has been JCR-indexed since shortly after launch.

PLOS Pathogens vs. PLOS ONE and PLOS Biology

All three are PLOS titles, but they differ in editorial model in a way that matters for interpreting any figure that surfaces for them. PLOS ONE is a broad multidisciplinary megajournal peer-reviewed for technical soundness only. PLOS Biology is a selective flagship reviewed for soundness and significance across biology generally. PLOS Pathogens is likewise selective — reviewed for both soundness and perceived significance — but narrowed specifically to pathogens and infectious-disease research rather than biology broadly. That combination of selectivity and narrow subject scope is a large part of why any reported figures for PLOS Pathogens diverge from both sibling titles, even though all three share a publisher, the same stated metrics policy, and the same Clarivate methodology where a JCR entry exists.

Worked example (illustrative, not the journal’s real figures)

Using round, hypothetical numbers rather than PLOS Pathogens’ actual annual citation and publication counts: if a journal published 900 citable items across the two preceding years, and those items received 4,400 citations in the JCR data year, the resulting JIF would be 4,400 / 900 ≈ 4.9. This is the same mechanical calculation Clarivate applies to every JCR-indexed title — what varies between journals is the citation and publication volume feeding it, and how selectively those citable items were chosen, not the arithmetic.

Why this number alone is a poor stand-in for quality

Citation-tracking organizations including DORA, the CoARA coalition, and Clarivate itself caution against over-relying on a single journal-level metric to judge an individual article or researcher. PLOS’s own stated policy agrees: a journal’s year-level citation average, sourced from wherever it can be found, blends together very different citation trajectories across the papers it publishes, so the figure still says little about any one paper — even for a selective, narrowly scoped title like PLOS Pathogens.

Counter-example

PLOS Pathogens’ CiteScore (a separate Elsevier/Scopus metric using a four-year citation window and a broader document set, and one of the metrics PLOS does actively promote) is not the same figure as its Clarivate JIF, and reporting one as if it were the other is a common sourcing error. Likewise, assuming PLOS Pathogens, PLOS Biology, and PLOS ONE share one editorial bar because they share a publisher is a common category error — PLOS Pathogens reviews narrowly for pathogen/infectious-disease significance, PLOS Biology reviews broadly across biology for significance, and PLOS ONE reviews only for technical soundness across nearly all disciplines; their acceptance rates and any reported figures diverge accordingly.

Keeping this current

Last verified by CASRAI: 16 August 2026, directly against journals.plos.org/plosone/s/journal-information (policy language shared across PLOS’s journal-information pages). This page no longer repeats third-party-tracker or Wikipedia-sourced Impact Factor figures for PLOS Pathogens, since PLOS’s own stated policy is not to promote one; check jcr.clarivate.com (institutional access required) for a specific number if one is genuinely needed. JCR figures generally refresh each June with Clarivate’s new release, so any figure obtained from JCR directly should be rechecked after that date.

Related terms

• Journal Impact Factor (JIF) — the general metric this page discusses in the specific context of PLOS’s policy toward it.
• PLOS ONE’s Journal Impact Factor (JIF) — the broad, soundness-only megajournal sibling title.
• PLOS Biology’s Journal Impact Factor (JIF) — the selective, broad-biology flagship sibling title.
• CiteScore — the metric PLOS actively promotes in place of the JIF.
• DORA (San Francisco Declaration on Research Assessment) — the reform commitment behind PLOS’s stated position.
• Scopus — the database behind CiteScore, the metric PLOS points to instead of the JIF.

Frequently Asked Questions

What is PLOS Pathogens’ Journal Impact Factor?

PLOS itself does not promote or display a current JIF for PLOS Pathogens — its own journal-information page states it does not consider Impact Factor “a reliable or useful metric to assess the performance of individual articles” but will provide it on request. CASRAI verified this policy language directly on journals.plos.org (16 August 2026). For the current 2025-data-year number, check jcr.clarivate.com with institutional access, or request it directly from PLOS, rather than relying on a third-party tracker or Wikipedia.

How is a journal’s Impact Factor calculated?

The Journal Impact Factor is a ratio: citations received in a given year to a journal’s citable items (articles and reviews) from the two preceding years, divided by the number of those citable items. Clarivate applies this same calculation to every JCR-indexed title — what differs between journals is the citation and publication volume feeding the ratio, not the arithmetic itself.

Is PLOS Pathogens a good journal?

PLOS Pathogens is a selective, significance-reviewed title restricted to pathogens and infectious-disease biology. However, DORA, the CoARA coalition, PLOS’s own stated policy, and Clarivate itself all caution against using a single journal-level metric like the JIF as a proxy for the quality of an individual article or researcher, since a journal’s year-level average blends together very different citation trajectories across the papers it publishes.

How does PLOS Pathogens compare to PLOS ONE and PLOS Biology?

All three are PLOS titles, but they differ in editorial model: PLOS ONE is a broad multidisciplinary megajournal peer-reviewed for soundness only, PLOS Biology is a selective flagship reviewed for soundness and significance across biology generally, and PLOS Pathogens is likewise selective but narrowed specifically to pathogens and infectious-disease research. See PLOS ONE’s page and PLOS Biology’s page for the sibling comparisons.

Is PLOS Pathogens’ CiteScore the same as its Journal Impact Factor?

No. CiteScore is a separate Elsevier/Scopus metric that uses a four-year citation window and a broader document set, while the Journal Impact Factor is Clarivate’s metric using a two-year window. PLOS actively promotes CiteScore over the JIF; reporting one as if it were the other is a common sourcing error regardless.

Why doesn’t this page state a specific current Impact Factor number for PLOS Pathogens?

Because PLOS’s own stated policy is not to promote one, and CASRAI could not independently verify a current figure directly from PLOS or from Clarivate’s JCR (which sits behind institutional authentication). An earlier version of this page repeated third-party-tracker figures as though they were current and confirmed; that has been corrected. Check jcr.clarivate.com directly or request the figure from PLOS if one is genuinely needed.