Safety and Immunogenicity of Hecolin® in Healthy Pregnant Women

Inclusion Criteria:

In order to be eligible to participate in this study, a pregnant/non-pregnant woman must meet all of the following criteria:

Pregnant women only:

1. Healthy women 16-45 years of age who are between 14 0/7 and 34 6/7 weeks gestation1on the day of planned vaccination with an uncomplicated, singleton pregnancy, whoare at no known increased risk for complications for herself and her infant.

2. Individual willing to provide written informed consent for herself and her infant toparticipate in the study.

3. Individual who can be followed up during the study period and can comply with thestudy requirements.

4. Individual and fetus in good health as determined by the outcome of medical history,physical examination, obstetric history, prenatal care (by ultrasound and otherprenatal assessment subject to gestational age), vital signs, laboratory evaluationsat screening and the clinical judgment of the investigator.

5. Participants who are willing and able to comply with scheduled visits, treatmentplan, laboratory tests, and other study procedures.

Non-pregnant women only:

1. Healthy women 16-45 years of age.

2. Individual willing to provide written informed consent to participate in the study.

3. Individual who can be followed up during the study period and can comply with thestudy requirements.

4. Individual in good health as determined by the outcome of medical history, physicalexamination, vital signs, laboratory evaluations at screening and the clinicaljudgment of the investigator.

5. Individuals who are willing and able to comply with scheduled visits, treatmentplan, laboratory tests, and other study procedures.

6. Females of childbearing potential with negative urinary pregnancy test on the day ofscreening.

7. Females of childbearing potential who are using an effective birth control method2for at least 4 weeks before the screening and up to 4 weeks after the lastvaccination.

Exclusion Criteria:

A pregnant/non-pregnant woman who meets any of the following criteria will be excluded from participation in this study:

1. Has received any hepatitis E vaccine in the past.

2. Febrile illness (axillary temperature ≥ 38.5°C) or acute illness within 3 days priorto the study vaccination.

3. Known history or allergy to study vaccine components and/or excipients or othermedications, or any other allergies or medical history deemed by the investigator toincrease the risk of an adverse event if they were to participate in the trial (e.g., Guillain-Barre Syndrome).

4. Major congenital abnormalities which in the opinion of investigator may affect theparticipant's participation in the study.

5. Known history of immune function disorders including immunodeficiency diseases (known HIV infection or other immune function disorders) and lupus.

6. Chronic use of systemic steroids (>2 mg/kg/day or >20 mg/day prednisone equivalentfor periods exceeding 10 days), cytotoxic or other immunosuppressive drugs withinpast 6 weeks.

7. Any abnormality or chronic disease which in the opinion of the investigator might bedetrimental for the safety of the participant and interfere with the assessment ofthe study objectives.

8. Behavioral or cognitive impairment, or chronic substance abuse, or psychiatricdisease or neural disorders, that, in the opinion of the investigator, couldinterfere with the participant's ability to participate in the trial.

9. History of splenectomy.

10. Past history of thrombocytopenia and/or thrombosis, myocarditis or pericarditis orany other significant cardiac condition.

11. With a known bleeding diathesis, or any condition that may be associated with aprolonged bleeding time resulting in contraindication for IM injections/bloodextractions. (Those who receive low dose aspirin (less than 100mg/day) are notexcluded)

12. Receipt of blood or blood-derived products in the past 3 months.

13. Receipt of other vaccines from 4 weeks prior to test vaccination or planned toreceive any vaccine within 4 weeks of last dose of study vaccine

14. As per Investigator's medical judgement, an individual could be excluded from thestudy in spite of meeting all inclusion/exclusion criteria mentioned above.

15. Concomitantly enrolled or scheduled to be enrolled in another trial.

16. Research staff involved with the clinical study or family/household members ofresearch staff.

17. Body mass index (BMI) of ≥ 40, at the time of the screening visit.

Pregnant women only:

1. Plans to terminate her pregnancy. Pregnancy complications (in the current pregnancy)such as preterm labor, gestational diabetes, hypertension (blood pressure (BP) > 140/90 in the presence of proteinuria or BP > 150/100 with or without proteinuria),or currently on an antihypertensive therapy, or pre-eclampsia, or evidence ofintrauterine growth restriction.

2. Prior stillbirth or neonatal death, or multiple (≥ 3) spontaneous abortions. 4.Prior preterm delivery ≤ 34 weeks gestation or having ongoing intervention (medical/surgical) in current pregnancy to prevent preterm birth.

3. Previous infant with a known genetic disorder or major congenital anomaly. 6.History of major gynecologic or major abdominal surgery (previous Caesarean sectionis not an exclusion) 7. Current pregnancy results from in vitro fertilization (IVF).

4. Current pregnancy results from rape or incest. 9. Plans to release the neonatefor adoption or the neonate to be a ward of the state.

5. Greater than 5 prior deliveries

Non-pregnant women only:

1. Pregnant or plan to be pregnant during the study period.