Exploratory Study to Estimate the Prophylactic Efficacy of Palivizumab in Healthy Adult Participants Inoculated With RSV

Inclusion Criteria

• An informed consent document signed and dated by the participant and the Investigator.
• Aged between 18 and 55 years old on the day of signing the consent form.
• In good health with no history, or current evidence, of clinically significant medical conditions, and no clinically significant test abnormalities that will interfere with participant safety, as defined by medical history, physical examination, (including vital signs), Electrocardiogram (ECG), and routine laboratory tests as determined by the Investigator.
• A documented medical history prior to enrolment.
• The following criteria are applicable to female participants participating in the study.
• Females of childbearing potential must have a negative pregnancy test prior to enrolment.
• Females of non-childbearing potential:
• Post- menopausal females; defined as having a history of amenorrhea for >12 months with no alternative medical cause, and /or by Follicle stimulating hormone (FSH) level >40mIU/mL, confirmed by laboratory
• Documented status as being surgically sterile (e.g. tubal ligation, hysterectomy, bilateral salpingectomy and bilateral oophorectomy).
• The following criteria apply to female and male participants:
• Female participants of childbearing potential must use one form of highly effective contraception. Hormonal methods must be in place from at least 2 weeks prior to the first study visit. The contraception use must continue until 30 days after the date of viral challenge/last dosing with IMP (whichever occurs last). Highly effective contraception is as described below:
• Established use of hormonal methods of contraception described below (for a minimum of 2 weeks prior to the first study visit). When hormonal methods of contraception are used, male partners are required to use a condom with a spermicide:
• Oral 2. Intravaginal 3. Transdermal b. Intrauterine device (IUD) c. Intrauterine hormone-releasing system (IUS) d. Bilateral tubal ligation e. Male sterilisation (with the appropriate post vasectomy documentation of the absence of sperm in the ejaculate) where the vasectomised male is the sole partner for that woman.

f. True abstinence - sexual abstinence is considered a highly effective method only if defined as refraining from heterosexual intercourse during the entire period of risk associated with the study treatments. The reliability of sexual abstinence needs to be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the participant.

b) Male participants must agree to the contraceptive requirements below at entry to quarantine and continuing until 90 days after the date of Viral challenge / last dosing with the investigational medicinal product (IMP) (whichever occurs last):

• Use a condom with a spermicide to prevent pregnancy in a female partner or to prevent exposure of any partner (male and female) to the IMP.
• Male sterilisation with the appropriate post vasectomy documentation of the absence of sperm in the ejaculate (please note that the use of condom with spermicide will still be required to prevent partner exposure). This applies only to males participating in the study
• In addition, for female partners of childbearing potential, that partner must use another form of contraception such as one of the highly effective methods mentioned above for female participants.
• True abstinence - sexual abstinence is considered a highly effective method only if defined as refraining from heterosexual intercourse during the entire period of risk associated with the study treatments. The reliability of sexual abstinence needs to be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the participant.

c) In addition to the contraceptive requirements above, male participants must agree not to donate sperm following discharge from quarantine until 90 days after the date of Viral Challenge/last