Study to Assess the Safety, Tolerability, and Preliminary Efficacy of B244 in Healthy Volunteers and Subjects With Seasonal Allergic Rhinitis

This is a Prospective, Controlled, Double Blinded, Single Center, Randomized, 3 Arm, Parallel
Assignment, Phase 1b/2a Study to assess the safety, tolerability, and preliminary efficacy of
B244 delivered as an intranasal spray in healthy volunteers and subjects with seasonal
allergic rhinitis. This will be a 2-part study. In Part 1, safety and tolerability will be
evaluated during 14 days of study treatment twice-a-day followed by 4 weeks of follow-up in
healthy volunteers. In Part 2, preliminary efficacy will be evaluated in subjects with a
history of seasonal allergic rhinitis outside of the local pollen season.

For Part 1 (safety and tolerability evaluation in healthy volunteers) we will enroll 24
subjects. Safety and tolerability will be assessed by reporting of AEs, physical examination
and vital signs (blood pressure, heart rate, respiratory rate) during 14 days of treatment
and up to 28 days of follow-up.

An internal safety committee meeting will review the 2 week Part 1 safety data and, if there
are no safety concerns, the study will proceed to Part 2 to evaluate preliminary efficacy in
subjects with a history of seasonal allergic rhinitis (SAR)

For Part 2 (preliminary efficacy evaluation in subjects with a history of SAR to ragweed
pollen) will enroll 42 subjects. Safety and tolerability will be assessed in subjects with
allergic rhinitis by reporting of AEs, physical examination and vital signs (blood pressure,
heart rate, respiratory rate) during 14 days of treatment.

For Part 2, study will be paused for safety review using the same stopping criteria as in
Part 1.

Rescue medications will not be allowed during the study.

Inclusion Criteria:

- Males and Females, 18 to 65 years of age (committed to consistent use of an acceptable
method of birth control as described in Section 10).

- In good general health as determined by a thorough medical history and physical
examination, and vital signs.

- Nonsmoker or ex-smoker (stopped >1 year prior to study entry).

- Subjects willing and able to provide written informed consent.

- Is willing and able to comply with the requirements of the protocol and must be
available for the full duration of the study.

- For Part 1, subjects asymptomatic from any seasonal or perennial allergens.

- For Part 1, elevated systolic blood pressure greater than 120 but less than 160 and
never been on antihypertensive medications or have been off any hypertensive treatment
for a period of 12 weeks or longer.

- For Part 2, subjects with a well-documented history of seasonal allergic rhinitis
(specifically ragweed pollen) with documentation of sensitivity by positive skin
testing and/or IgE testing to the relevant allergens 12 months prior to enrollment
that correlate with clinical history.

- For Part 2, a ragweed positive skin prick test with a wheal diameter at least 5 mm
larger than the negative control and/or a ragweed specific IgE greater or equal to 0.7
kU/L.

- For Part 2, subjects with confounding allergies, or sensitization to cat epithelia,
dog epithelia, Dermatophagoides farinae, or Dermatophagoides pteronyssinus or
prevalent and relevant seasonal allergens as per the skin prick test may be included
if sensitization is not clinically relevant (ie. subject is non-symptomatic and/or can
avoid the allergen during the study) at the discretion of the Investigator.

- For Part 2, subjects with a baseline TNSS ≤ 3/12 at Visit 3 and a minimum qualifying
TNSS score of a change of 6/12 from their baseline score after NAC #1 on at least 2
diary cards.

- For Part 2, subjects' average post diluents nasal congestion score must be < 1 at
admission for each study visit.

Exclusion Criteria:

- Pregnancy or breast-feeding

- Female of childbearing potential not using adequate contraceptive measures.

- Smoking within the past year or during the protocol.

- Systemic corticosteroid or other immunosuppressive medications use in the previous
three months or during the protocol.*

- Intranasal corticosteroid use in the previous month or during the protocol.*

- Intranasal antihistamine or cromolyn use in the previous week or during the study.*

- Allergen immunotherapy during previous 12 months or during the protocol.*

- Omalizumab use in previous 12 months or during the protocol.*

- Systemic antihistamine or leukotriene modifying medication use in the previous week or
during the protocol.*

- Use of antibiotics, NSAIDS, antihypertensives, beta-blockers, photosensitizing
medications, or vitamin D supplements during study.

- Use of any intranasally administered over-the-counter product or nasal irrigation
(e.g., neti pot) during study.

- Inability to give informed consent.

- Persistent asthma or any medical condition that in the opinion of the investigator may
compromise the subject's ability to safely participate in the study.

- Subjects with any significant clinical abnormalities which may interfere with study
participation.

- Prior use of AO+ Mist.

- Subjects with immunodeficiencies, nasal lesions, nasal polyps, or sinus infections.

- Use of an investigational drug within 30 days before screening Visit 1. * Exclusionary
criterion due to 1) medication use as marker of persistent comorbid allergic or
inflammatory condition that may increase subject risk with study participation, 2)
potential of medication to interfere with study outcome measures or results.