Bibliographic and Ontological Evidence Review: "Lone Star Virus Infection"

Prepared: 2026-08-08 · Scope: identity, evidence base, causality language, and preprint status only. No laboratory, clinical, or experimental-model detail is reproduced.

Scope note and method

This review answers four bounded questions using primary and authority records only: NCBI Taxonomy (E-utilities + Taxonomy Browser), NCBI Nucleotide, PubMed, Europe PMC REST, ICTV, the bioRxiv API, and the publisher (CDC Emerging Infectious Diseases) record. Peer-reviewed and preprint evidence are labeled separately throughout.

Deliberately excluded, per the requested constraints: assay procedures, isolation/culture/reverse-genetics methodology, animal-model mechanisms, doses/parameters, diagnostic or therapeutic guidance, and any generalization from the single human observation. Where the underlying sources contain such material (notably the 2026 preprint), it is cited by identity only and its substance is not summarized.

1. Taxonomic and ontological identity

1.1 Current identity

The virus called "Lone Star virus" (LSV) in PMID:39983710 and PPR:PPR1272399 resolves to a single, unambiguous taxon:

Full NCBI lineage (verified by efetch db=taxonomy, 2026-08-08): Viruses → Riboviria (realm, 2559587) → Orthornavirae (kingdom, 2732396) → Negarnaviricota (phylum, 2497569) → Polyploviricotina (subphylum, 2497571) → Bunyaviricetes (class, 3151693) → Hareavirales (order, 3151839) → Phenuiviridae (family, 1980418) → Bandavirus (genus, 2733256) → Bandavirus amblyommae (species, 3048183).

An ontological point that matters for curation: NCBI retains a three-node chain, not a single node. txid1219465 ("Lone Star virus") is the virus-name node; txid2734426 ("Lone Star bandavirus") is the superseded ICTV species epithet retained as an intermediate no-rank node; txid3048183 is the current species. A KB entry that binds to txid2734426 is binding to a deprecated nomenclatural form, not to a distinct organism. The NCBI Browser species page lists "Lone Star bandavirus", "Lone Star virus", and "Lone Star virus TMA1381" as alternate names under 3048183; note that the corresponding efetch XML did not render an OtherNames block, so treat the browser synonym list as display-layer metadata rather than a stable API field.

1.2 Nomenclatural history (why three names exist)

• 1969 — first described as an unnamed new agent from Amblyomma americanum: Kokernot RH, Calisher CH, Stannard LJ, Hayes J. Am J Trop Med Hyg 1969;18(5):789–95. PMID:5810802. (Isolate collected 1966–67.)
• 2013 — genome sequenced and placed as a highly divergent bunyavirus (then discussed in phlebovirus terms; genus Bandavirus did not yet exist): Swei A, Russell BJ, Naccache SN, et al. PLoS One 2013;8(4):e62083. PMID:23637969, DOI:10.1371/journal.pone.0062083.
• ~2020 — ICTV establishes genus Bandavirus; species named Lone Star bandavirus (this is the origin of NCBI txid2734426).
• 2023 — ICTV binomial renaming of Negarnaviricota species; Lone Star bandavirus → Bandavirus amblyommae. Documented in Kuhn JH, Abe J, Adkins S, et al., "Annual (2023) taxonomic update…", J Gen Virol 2023;104(8), DOI:10.1099/jgv.0.001864, PMID:37622664, PMCID:PMC10721048 (abstract: "Two genera and 538 species were renamed"). A Europe PMC full-text search for the exact string "Bandavirus amblyommae" returns 3 records, of which two are this paper and the 2024 annual update (PMID:40512168, DOI:10.1099/jgv.0.002077).
• Current ICTV release: MSL41 (2025), per https://ictv.global/msl.

Verification limitation, stated explicitly: the ICTV taxon-detail page is JavaScript-rendered and did not return taxon data to a plain fetch, and the ICTV Bandavirus report chapter does not enumerate its species inline (it states only that "Nine bandaviruses are assigned to the genus Bandavirus"). ICTV species-level assignment is therefore corroborated here indirectly but consistently by three independent lines: (a) the ICTV chapter's count of nine, which matches exactly the nine species NCBI places in genus Bandavirus; (b) NCBI's ICTV-synchronized species record; and (c) the ICTV annual-update papers above. I did not read the MSL41 spreadsheet row directly.

1.3 Reference sequence identifiers

• RefSeq (reference genome, isolate TMA 1381): NC_021242.1 (L, 6,341 bp), NC_021243.1 (M, 3,313 bp), NC_021244.1 (S, 1,876 bp).
• Original GenBank deposits (Swei et al. 2013): KC589005.1, KC589006.1, KC589007.1.
• Sequences derived from the human observation (see §2): PQ347830.1 (297 bp), PQ347831.1 (224 bp), PQ347832.1 (140 bp) — all partial S segment, strain UC1, /host="Homo sapiens", /isolation_source="cerebrospinal fluid", /country="USA: Idaho", /collection_date=2023, submitted 14-SEP-2024 by Chiu CY & Servellita V (UCSF), released 12-OCT-2024. These three records carry the GenBank UNVERIFIED: flag in their DEFINITION lines. That flag is part of the primary record and should be carried into any provenance annotation; it is a documented qualification on the only human-derived sequence evidence that exists for this virus.

Total NCBI Nucleotide holdings under txid1219465[Organism:exp]: 15 records (3 RefSeq + 3 GenBank originals + 3 human-derived partials + 6 associated protein/duplicate entries).

1.4 Distinguishing similarly named tick-associated entities

An exhaustive NCBI Taxonomy name search for "lone star virus" OR "lone star bandavirus" OR "lone star tick" returns exactly three taxa: 1219465, 2734426, and 6943. The following are the realistic confusion set:

The nine NCBI species in genus Bandavirus are: albatrossense (3051988), amblyommae (3048183), bhanjanagarense (3051989), dabieense (2748958), guertuense (3051991), heartlandense (3051992), kismaayoense (3051993), razdanense (3051994), zwieselense (3059756).

One further disambiguation trap: pre-2020 literature (including PMID:23637969) describes LSV as an unclassified/divergent "bunyavirus" or discusses it in phlebovirus terms. That is the same virus under superseded higher classification, not a separate entity.

2. Peer-reviewed human observations

2.1 Count: one

Exactly one peer-reviewed human observation associated with Bandavirus amblyommae has been published — a single patient.

Exhaustive searches performed 2026-08-08: - PubMed "lone star virus" (all fields): 5 records total — PMIDs 42384674, 41636781, 39983710, 23637969, 5810802. Of these, only 39983710 contains a human observation. - Europe PMC "lone star virus" (all sources, MED + PPR + PMC): 52 records. Manual triage of the full result set found no additional human case report, human case series, or LSV-specific human seroprevalence study. The non-LSV-specific hits are reviews, tick-virome and vector surveys, Heartland/Bourbon serosurveys in wildlife, SFTSV-focused work, and ICTV taxonomy updates. - The two other 2026 LSV-titled peer-reviewed papers are not human observations: PMID:41636781 (Eaton CW, et al., Vector Borne Zoonotic Dis 2026;26(6):355–64, DOI:10.1177/15303667261420983) concerns viral and host model systems; PMID:42384674 (Li C, et al., Virulence 2026;17(1):2696699) is a genus-level Bandavirus comparison. Their content is out of the scope constraints of this review and, being non-human, cannot be used to characterize human disease.

2.2 The single observation

Citation (peer-reviewed): Chiu CY, Godasi RR, Hughes HR, Servellita V, Foresythe K, Tubati A, Zorn K, Sidhu S, Wilson MR, Bethina SV, Abenroth D, Cheng Y, Grams R, Reese C, Isada C, Thottempudi N. "Two Human Cases of Fatal Meningoencephalitis Associated with Potosi and Lone Star Virus Infections, United States, 2020–2023." Emerging Infectious Diseases 2025;31(2):215–221. DOI:10.3201/eid3102.240831. PMID:39983710. PMCID:PMC11845157. Publication type: Case Reports; Journal Article.

What was reported for the LSV patient (Case 2 of 2): a 60-year-old man from Idaho, USA, with a history of common variable immunodeficiency, presenting with "a 1-week history of headache and myalgias" and mental-status changes, in whom cerebrospinal fluid metagenomic next-generation sequencing was "positive for Lone star virus (LSV)". The reported syndrome is fatal meningoencephalitis; the patient "died 26 days after admission."

Constraints on how this may be represented: - n = 1. This is one patient. No frequency, penetrance, incidence, case-fatality rate, or recurring clinical spectrum can be derived from it, and none is asserted here. - Case 1 of the same paper is a different virus (Potosi virus, Orthobunyavirus potosiense, Peribunyaviridae). The paper's title and abstract cover both; only Case 2 pertains to LSV. - The paper does not claim priority. It does not state that this is the first human detection of LSV, and no such claim should be attributed to it. What can be said, as a negative bibliographic finding: no earlier peer-reviewed human observation for this virus was found in PubMed or Europe PMC. - The paper's own framing is associative, not causal — "Associated with" in the title, and "associated with fatal cases of meningoencephalitis in immunocompromised patients" in the Discussion.

3. Discordant confirmation and the authors' causality language

3.1 The discordance (stated at the minimum level needed to assess causality)

Detection and confirmation did not agree between laboratories. Reported verbatim by the authors:

"Additional testing of residual CSF by CDC did not detect reads from LSV on mNGS, and confirmatory testing with viral isolation and plaque reduction neutralization testing was negative."

At the originating laboratory, detection was internally reproducible across sequencing runs (initially 50 of 14,386,666 reads aligning to the LSV genome at 84%–95% identity; a subsequent higher-depth run yielded 2,460 reads mapping to all three genome segments, covering 1,601 bp (13.6%) of the 11,730-bp trisegmented genome, with 183 SNPs and pairwise identity of 88.6%).

The authors attribute the inter-laboratory discordance to "potential sample degradation caused by multiple freeze–thaw cycles and longer storage times" and to "differences in sample preparation methods." That is their stated explanation; it is an attribution, not an independent resolution of the discordance.

Net position: the detection was sequence-based only, reproduced within one laboratory, and not independently confirmed — a second, independent laboratory failed to redetect it and returned negative results on two orthogonal confirmatory approaches. The corresponding sequence deposits are additionally flagged UNVERIFIED: by GenBank (§1.3). No supporting serologic confirmation is reported; the authors separately note that serologic testing "is problematic for highly immunocompromised patients, for whom results can be false-negative."

3.2 What the peer-reviewed authors say about causality

The authors explicitly decline a causal claim:

"Because mNGS is a molecular detection technique and positive testing alone is insufficient to fulfill Koch's postulates, caution is warranted with clinical interpretation of mNGS results, especially with detection of a novel agent of unclear pathogenicity in highly susceptible immunocompromised hosts."

and:

"Further clinical and epidemiologic studies are needed to characterize the spectrum of clinical disease and pathogenicity associated with POTV and LSV infections in humans."

Explicit statement of uncertainty. Etiologic causality is not established. The published evidence supports a claim of the form "viral RNA was detected in the CSF of one immunocompromised patient with fatal meningoencephalitis, without independent confirmation" — an association reported in a single patient. It does not support "Bandavirus amblyommae causes meningoencephalitis," "LSV is a human pathogen," or any statement about human transmission, diagnosis, treatment, phenotype frequency, or pathogenicity. The authors themselves characterize LSV as "a novel agent of unclear pathogenicity."

4. Status of PPR:PPR1272399 / DOI:10.64898/2026.07.06.736858

Metadata note for curation: Europe PMC renders the last author as "Tilston NL", while bioRxiv gives "Tilston-Lunel, N. L." — an indexing truncation of a hyphenated surname, not two different people. Also note the unusual DOI prefix 10.64898 (not the legacy 10.1101 bioRxiv prefix); the bioRxiv API nonetheless returns server: bioRxiv for this DOI, confirming the server assignment. Where the DOI stem encodes 2026.07.06 and the posting date is 2026-07-07, cite 2026-07-07 as the posting date.

Relationship to the human report. The preprint cites the peer-reviewed human observation as its motivation. Its abstract states that LSV "remains poorly studied, and its pathogenic potential is not well defined," and that "Recent detection of LSV RNA in cerebrospinal fluid from an immunocompromised patient in Idaho, U.S., with fatal meningoencephalitis further highlights the need" for further study. The Idaho patient is Case 2 of PMID:39983710 (§2.2) — so the two documents are linked by the preprint referencing the case report as background, not by any shared patient data, and not by any confirmation of the human finding.

The preprint is a laboratory virology study. Its experimental content — model systems, reverse-genetics work, comparative outcomes, and cross-protection findings — is outside the scope of this review by the stated constraints and is not summarized here. Two points bear on evidence weight only:

1. It is preprint evidence, uncertified by peer review, version 1, with no journal version as of 2026-08-08.
2. It contains no human observation and therefore cannot corroborate the Idaho detection, cannot resolve the inter-laboratory discordance in §3.1, and cannot be used to infer human pathogenicity, transmission, or clinical phenotype.

Summary of evidence tiers

Verification limitations

Three things I could not verify directly and am not asserting as verified: (a) the ICTV MSL41 spreadsheet row for Bandavirus amblyommae was not read — ICTV species assignment is corroborated indirectly as described in §1.2; (b) the ICTV taxon-detail page did not render to a plain fetch, so no ICTV taxnode_id is reported; (c) full texts of PMID:41636781 and PMID:42384674 were screened by title/abstract-level metadata rather than read in full, though both are non-human by title and neither returned as a human-observation record in the Europe PMC sweep.

Sources

• PubMed 39983710 — Chiu CY, et al. Emerg Infect Dis 2025;31(2):215–221 · PMC11845157 · CDC EID publisher record, DOI:10.3201/eid3102.240831
• PubMed 23637969 — Swei A, et al. PLoS One 2013;8(4):e62083
• PubMed 5810802 — Kokernot RH, et al. Am J Trop Med Hyg 1969;18(5):789–95
• PubMed 37622664 — Kuhn JH, et al. Annual (2023) taxonomic update, J Gen Virol · PubMed 40512168 — Annual (2024) update
• NCBI Taxonomy — Bandavirus amblyommae (txid3048183) · Lone Star virus (txid1219465) · genus Bandavirus (txid2733256) · Amblyomma americanum (txid6943)
• NCBI Nucleotide NC_021242.1 · NC_021243.1 · NC_021244.1 · PQ347830.1 · PQ347831.1 · PQ347832.1
• ICTV Master Species List index (MSL41, 2025) · ICTV Report — Genus: Bandavirus · ICTV Report — Family: Phenuiviridae · ICTV current taxonomy release
• Europe PMC preprint PPR1272399 · bioRxiv API record, DOI:10.64898/2026.07.06.736858
• PubMed 41636781 — Eaton CW, et al. Vector Borne Zoonotic Dis 2026 · PubMed 42384674 — Li C, et al. Virulence 2026

One operational note unrelated to the report's content: several claude.ai MCP connectors in this session (PubMed, OLS, and others) are unauthenticated and could not be used here, so all queries went through public REST/E-utilities endpoints instead. Authorizing those connectors in an interactive session would let a future run query PubMed and OLS directly.