964 F.3d 1072
Fed. Cir.2020Background
- L.M., born July 26, 2010, received routine childhood vaccinations (including DTaP) on February 10, 2011; within hours she developed fever, lethargy, poor tone, and by February 15 experienced seizures and was diagnosed with infantile spasms.
- L.M. suffered persistent, severe seizures and developmental delays; later genetic testing identified a DYNC1H1 gene mutation (stem region).
- Petitioner filed a Vaccine Act petition (Jan. 27, 2014) alleging the Feb. 10, 2011 vaccinations significantly aggravated: (a) a preexisting encephalopathy (on-table claim as to DTaP within 72 hours) and (b) a preexisting seizure disorder (off-table claim as to all vaccines that day).
- The Special Master denied both claims (finding no QAI-defined pre-vaccination encephalopathy and that the genetic mutation, not vaccination, explained L.M.’s course). The Court of Federal Claims affirmed. Petitioner appealed to the Federal Circuit.
- The Federal Circuit: affirmed denial of the on-table encephalopathy claim (adopting a DeRoche/acute-only reading of the QAI for on-table aggravation) but vacated and remanded the off-table significant‑aggravation denial for further proceedings.
Issues
| Issue | Plaintiff's Argument (Sharpe) | Defendant's Argument (HHS/Special Master) | Held |
|---|---|---|---|
| Whether the QAI definition of “encephalopathy” must include both acute and chronic elements for an on‑table significant‑aggravation claim | QAI should be read by its ordinary meaning (“disease of the brain”); acute requirement unduly restricts on‑table claims | QAI contemplates acute followed by chronic; Special Master (following DeRoche) narrowed it to only acute for on‑table aggravation; L.M. had no pre‑vaccine acute encephalopathy | Affirmed: court upheld narrowing to acute encephalopathy for on‑table significant aggravation and found no pre‑vaccine acute encephalopathy in L.M. |
| Whether Loving prong 3 requires comparing post‑vaccine condition to the predicted natural course of the preexisting disease (i.e., petitioner must disprove that genetics explains outcome) | Special Master erred by requiring petitioner to prove expected genotype‑phenotype outcome and that vaccine made condition worse than that predicted course | Court below and Special Master treated proof of expected outcome as implicit part of prong 3 | Reversed error: Loving prong 3 only requires comparison of pre‑ and post‑vaccination condition (no burden to prove what would have happened absent vaccination) |
| Whether Loving prong 4 required petitioner to eliminate the genetic mutation as a cause or to produce specific literature proving vaccines can worsen DYNC1H1 outcomes | Petitioner needed only a medically plausible theory that vaccine "can" aggravate the seizure disorder; literature not required; experts testified vaccines/infection can provoke neuroinflammation and worsen seizures | Special Master demanded stronger proof (e.g., literature, rebuttal of SCN1A research applicability, or that Ambry patient shows inevitability) | Reversed error: petitioner satisfied the lower threshold for a plausible medical theory; rejecting theory for lack of literature or because of single-case comparisons was improper |
| Whether government met its burden under the “factor unrelated” test to show the DYNC1H1 mutation was the sole substantial cause of L.M.’s severe outcome | Mutation location (stem) more commonly causes non‑severe motor phenotypes; severe cognitive/seizure phenotype in stem mutations is not the typical outcome and government cannot win solely by proving a mutation exists | Special Master found mutation was the sole substantial factor and thus barred recovery | Vacated: record did not support the finding that the stem mutation was more likely than not the sole substantial cause; remand required for further factfinding |
Key Cases Cited
- Whitecotton ex rel. Whitecotton v. Sec'y of Health & Human Servs., 81 F.3d 1099 (Fed. Cir. 1996) (on‑table significant‑aggravation framework: compare pre‑ and post‑vaccination condition)
- Loving ex rel. Loving v. Sec'y of Health & Human Servs., 86 Fed. Cl. 135 (Fed. Cl. 2009) (six‑prong test for off‑table significant aggravation)
- Althen v. Sec'y of Health & Human Servs., 418 F.3d 1274 (Fed. Cir. 2005) (three‑part causation‑in‑fact framework: theory, logical sequence, temporal relationship)
- Stone ex rel. Stone v. Sec'y of Health & Human Servs., 676 F.3d 1373 (Fed. Cir. 2012) (evidence of other possible sources is relevant to both prima facie showing and factors unrelated)
- Knudsen ex rel. Knudsen v. Sec'y of Health & Human Servs., 35 F.3d 543 (Fed. Cir. 1994) (preponderance standard does not require scientific certainty)
- Locane v. Sec'y of Health & Human Servs., 685 F.3d 1375 (Fed. Cir. 2012) (discusses evaluation of whether vaccination affected condition)
- Andreu ex rel. Andreu v. Sec'y of Health & Human Servs., 569 F.3d 1367 (Fed. Cir. 2009) (medical literature and epidemiology not required to establish a plausible medical theory)
- Paluck v. Sec'y of Health & Human Servs., 786 F.3d 1373 (Fed. Cir. 2015) (appellate duty to ensure special master applied the Vaccine Act correctly and articulated a rational basis for factual findings)
- Lampe v. Sec'y of Health & Human Servs., 219 F.3d 1357 (Fed. Cir. 2000) (standard of review for appeals from Court of Federal Claims on vaccine‑program decisions)