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A Phase IV Clinical Trial of Influenza Vaccine (Split Virion), Inactivatedin (Anflu®) Pregnant Women (AnFLU-PREG)

16. september 2026 oppdatert av: Sinovac Biotech Co., Ltd

A Phase IV, Randomized, Double-blind, Positive-controlled , Multicenter Clinical Trial to Evaluate the Immunogenicity and Safety of Influenza Vaccine (Split Virion) , Inactivated (Anflu®) in Pregnant Women

A phase IV clinical trial of Influenza Vaccine (Split Virion), Inactivated (Anflu®) developed by Sinovac Biotech Co., Ltd will be conducted in pregnant women.

A total of 150 healthy pregnant women aged 18~45 years at 22 to 34 weeks (+6 days) of pregnancy will be enrolled. All participants will be randomized to test group and control group in a ratio of 2:1 and receive one dose of vaccine (0.5 mL) of Sinovac Influenza Vaccine (Split Virion) , Inactivated (Anflu®) or Sanofi VAXIGRIP®, respectively.

Studieoversikt

Status

Har ikke rekruttert ennå

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

A phase IV clinical trial of Influenza Vaccine (Split Virion), Inactivated (Anflu®) developed by Sinovac Biotech Co., Ltd will be conducted in Chinese pregnant women.

A total of 150 healthy pregnant women aged 18~45 years at 22 to 34 weeks (+6 days) of pregnancy will be enrolled.The trial is a randomized, double-blind, positive controlled study to evaluate the immunogenicity and safety of Influenza Vaccine (Split Virion) ,Inactivated (Anflu®) manufactured by Sinovac. The active control vaccine is VAXIGRIP® manufactured by Sanofi.

For immunogenicity assessment, blood samples will be collected from participants prior to vaccination, 28 days post-vaccination, and at the end of pregnancy (at delivery) to evaluate antibody levels in pregnant women following influenza vaccination. Additionally, the cord blood samples will be collected at delivery to assess transplacental antibody transfer to the fetus. Antibodies will be tested using the hemagglutination-inhibition (HI) assay.

For safety assessment, any immediate adverse events within 30 minutes after vaccine administration, solicited local and systemic adverse events within 7 days and unsolicited adverse events within 28 days will be collected. Serious adverse events will be collected from the time of informed consent signature until 3 months after delivery (or until 3 months after the event if pregnancy termination occurs). Pregnancy and neonatal outcomes will be collected by medical record review .

Studietype

Intervensjonell

Registrering (Antatt)

150

Fase

  • Fase 4

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studiesteder

      • Changsha, Kina
        • Hunan Provincial Maternal and Child Health Care Hospital
        • Ta kontakt med:
          • Tang Yabing
      • Chengdu, Kina
        • Chengdu Women's and Children's Central Hospital
        • Ta kontakt med:
          • Lai Fan
      • Chongqing, Kina
        • The First Affiliated Hospital of Chongqing Medical University
        • Ta kontakt med:
          • Qi Hongbo
      • Guangzhou, Kina
        • Nanfang Hospital, Southern Medical University
        • Ta kontakt med:
          • Huang Liping
      • Nanjing, Kina
        • Nanjing Drum Tower Hospita
        • Ta kontakt med:
          • Li Jie
      • Wuhan, Kina
        • Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology
        • Ta kontakt med:
          • Feng Ling

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år til 45 år (Voksen)

Tar imot friske frivillige

Ja

Kjønn som er kvalifisert for studier

Hunn

Beskrivelse

Inclusion Criteria:

  1. Healthy pregnant women aged 18 to 45 years (inclusive) with stable health status, at 22 to 34 weeks (+6 days) of gestation. Gestational age is determined based on early ultrasound examination, or based on the last menstrual period if early ultrasound is unavailable.
  2. Participants are able to understand and sign the informed consent form voluntarily;
  3. Participants are willing and able to adhere to visit schedules and maintain accessible contact throughout the study period;
  4. Participants should provide verifiable identification;
  5. Have a singleton pregnancy;
  6. Have normal non-invasive prenatal DNA test and systematic ultrasound results during the current pregnancy; normal amniocentesis results are required if the test has been performed.

Exclusion Criteria:

  1. Have a history of two or more preterm deliveries (delivery before 37 weeks of gestation), previous infants with low birth weight (birth weight <2500 g), or a history of neonatal asphyxia or neonatal neurological damage;
  2. Have a history of multiple unexplained spontaneous abortions;
  3. Have received any influenza vaccine or the influenza vaccine for the current influenza season within 6 months prior to enrollment, or plan to receive influenza vaccination during the study period.
  4. Have suffered from seasonal influenza within 6 months prior to enrollment.
  5. Have a history of Guillain-Barré syndrome within 6 weeks after previous influenza vaccination.
  6. Have allergic reactions or other severe adverse reactions to any influenza vaccine or its components.
  7. Have severe autoimmune diseases or immunodeficiency diseases (including but not limited to active systemic lupus erythematosus, rheumatoid arthritis, asplenia, functional asplenia, and HIV infection) and are judged unsuitable for vaccination by the investigator.
  8. Abnormal coagulation function (such as coagulation factor deficiency, coagulation disorders or platelet abnormalities).
  9. Have severe chronic diseases (including but not limited to cardiovascular diseases, partial liver diseases, renal diseases or malignant tumors) that may interfere with the study as judged by the investigator.
  10. Have a current or previous history of severe neurological diseases (epilepsy, convulsions) or psychiatric disorders, or have a family history of psychiatric disorders.
  11. Received corticosteroids (adult prednisone ≥20 mg/day or equivalent) or other immunosuppressants for ≥14 days, or cytotoxic therapy within 6 months prior to vaccination, or plan to receive such therapy during the study period.
  12. Received immunoglobulins or other blood products within 3 months prior to vaccination, or plan to receive such products during the study period.
  13. Received any vaccine within 28 days prior to study vaccination, or plan to receive any vaccine within 28 days after study vaccination.
  14. Have enrolled in other clinical trials of investigational drugs or vaccines during the follow-up period, or plan to receive investigational drugs or vaccines during the study period.
  15. Have acute diseases or acute exacerbation of chronic diseases within 7 days before vaccination.
  16. Have fever on the scheduled vaccination day with an axillary temperature ≥37.3 °C before vaccination.
  17. Have clinically significant abnormal laboratory findings as judged by the investigator, or meet any of the following laboratory criteria: a) White blood cell count >15.0×10^9/L; b) Neutrophil percentage >85%; c) Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) >2 times the upper limit of normal (2×ULN); d) Total bilirubin >2 times the upper limit of normal (2×ULN).
  18. Any other factors which are unsuitable for participation in the clinical trial as judged by the investigator.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Forebygging
  • Tildeling: Randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Firemannsrom

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: Test Group

100 participants will receive one dose of vaccine (0.5 mL) of Sinovac Influenza Vaccine (Split Virion) Inactivated (Anflu®) . Route of administration is intramuscular injection at deltoid muscle of upper arm.Immunization schedule is 1 dose

Participants will receive one dose of Sinovac Anflu® .

Aktiv komparator: Control Group

50 participants will receive one dose of vaccine (0.5 mL) of VAXIGRIP® manufactured by Sanofi. Route of administration is intramuscular injection at deltoid muscle of upper arm.Immunization schedule is 1 dose

Participants will receive one dose of Sanofi Vaxigrip®.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
The seroconversion rates (SCRs) of hemagglutination inhibition (HI) antibodies at day 28 ,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: 28 days after vaccination

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Seroconversion is defined as either a baseline HI titer <1:10 and a post-vaccination titer ≥1:40 or a baseline HI titer ≥1:10 and a minimum 4-fold rise in post-vaccination HI antibody titer.

28 days after vaccination
Incidence of adverse reactions within 28 days after vaccination
Tidsramme: 28 days after vaccination

Incidence of adverse reactions within 28 days after vaccination. Adverse reactions include solicited and unsolicited adverse reactions. Solicited local (injection site) symptoms: pain, swelling, erythema, induration, pruritus; Solicited systemic (non-injection site) symptoms: fever (axillary temperature), fatigue, myalgia, headache, hypersensitivity reaction.

28 days after vaccination

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
The seroprotection rates (SPRs) of HI antibodies at day 28 ,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: 28 days after vaccination

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Seroprotection is defined as an HI titer ≥1: 40.

28 days after vaccination
The geometric mean titers (GMTs) of HI antibodies at day 28 ,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: 28 days after vaccination

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Log-transformed post-vaccination HI antibody titer will be the dependent variable, with treatment group as fixed effect and log-transformed pre-vaccination HI antibody titer as covariate. Least-squares mean differences with two-sided 95% CIs will be estimated and back-transformed via exponentiation to derive adjusted GMT ratios (experimental vs control) and corresponding two-sided 95% CIs.

28 days after vaccination
The geometric mean fold rises (GMFRs) of HI antibodies at day 28 ,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: 28 days after vaccination

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Geometric mean of antibody fold-rise with two-sided 95% CI will be calculated , along with the geometric mean ratio and its corresponding two-sided 95% CI.

28 days after vaccination
The SCRs of HI antibodies at delivery, as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: At the date of delivery , estimated to be 6-18 weeks after randomization.

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Seroconversion is defined as either a baseline HI titer <1:10 and a post-vaccination titer ≥1:40 or a baseline HI titer ≥1:10 and a minimum 4-fold rise in post-vaccination HI antibody titer.

At the date of delivery , estimated to be 6-18 weeks after randomization.
The SPRs of HI antibodies at delivery ,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: At the date of delivery , estimated to be 6-18 weeks after randomization.

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Seroprotection is defined as an HI titer ≥1: 40.

At the date of delivery , estimated to be 6-18 weeks after randomization.
The GMTs of HI antibodies at delivery,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: At the date of delivery , estimated to be 6-18 weeks after randomization.

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Log-transformed post-vaccination HI antibody titer will be the dependent variable, with treatment group as fixed effect and log-transformed pre-vaccination HI antibody titer as covariate. Least-squares mean differences with two-sided 95% CIs will be estimated and back-transformed via exponentiation to derive adjusted GMT ratios (experimental vs control) and corresponding two-sided 95% CIs.

At the date of delivery , estimated to be 6-18 weeks after randomization.
The GMFRs of HI antibodies at delivery,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: At the date of delivery , estimated to be 6-18 weeks after randomization.

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Geometric mean of antibody fold-rise with two-sided 95% CI will be calculated , along with the geometric mean ratio and its corresponding two-sided 95% CI.

At the date of delivery , estimated to be 6-18 weeks after randomization.
The SPRs of HI antibodies in cord blood at delivery ,as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: At the date of delivery, estimated to be 6-18 weeks after randomization

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Seroprotection is defined as an HI titer ≥1: 40.

At the date of delivery, estimated to be 6-18 weeks after randomization
The GMTs of HI antibodies in cord blood at delivery, as measured by HAI assay for vaccine-matched influenza A and B
Tidsramme: At the date of delivery, estimated to be 6-18 weeks after randomization

Influenza A included H1N1 and H3N2 and influenza B strains included Victoria-lineage. Log-transformed post-vaccination HI antibody titer will be the dependent variable, with treatment group as fixed effect and log-transformed pre-vaccination HI antibody titer as covariate. Least-squares mean differences with two-sided 95% CIs will be estimated and back-transformed via exponentiation to derive adjusted GMT ratios (experimental vs control) and corresponding two-sided 95% CIs.

At the date of delivery, estimated to be 6-18 weeks after randomization
Incidence of serious adverse events from vaccination through 3 months after delivery.
Tidsramme: From vaccination to 3 months after delivery.

Serious adverse events within 3 months after delivery.

From vaccination to 3 months after delivery.
Pregnancy outcomes
Tidsramme: At the date of delivery, estimated to be 6-18 weeks after randomization

Pregnancy outcomes: term birth, preterm birth, elective termination of pregnancy, fetal death, and gestational complications, etc.

At the date of delivery, estimated to be 6-18 weeks after randomization
Neonatal birth outcomes
Tidsramme: 3 months after delivery

Birth outcomes: normal status, low birth weight, congenital malformations, neonatal NICU admission, and neonatal death, etc.

3 months after delivery

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Etterforskere

  • Hovedetterforsker: Qi Hongbo, First Affiliated Hospital of Chongqing Medical University

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Antatt)

1. oktober 2026

Primær fullføring (Antatt)

1. februar 2027

Studiet fullført (Antatt)

1. april 2027

Datoer for studieregistrering

Først innsendt

28. august 2026

Først innsendt som oppfylte QC-kriteriene

16. september 2026

Først lagt ut (Faktiske)

21. september 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

21. september 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

16. september 2026

Sist bekreftet

1. august 2026

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Andre studie-ID-numre

  • PRO-INF-4015

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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