Beginning Assessment of Cutaneous Treatment Efficacy of Roseomonas in Atopic Dermatitis

The underlying pathology of atopic dermatitis (AD) consists of defective skin barrier
function, susceptibility to Staphylococcus aureus skin infection, and immune imbalance. There
is currently no cure for AD. Preclinical data in a mouse model of AD suggest that commensal
Gram-negative bacteria (CGN), such as Roseomonas mucosa, from a healthy source can relieve
symptoms of AD and have antimicrobial effects. In this study, we will first evaluate the
safety of R mucosa-based biotherapy in adults with AD (age 18+ years; part 1), and then
evaluate the safety and activity of R mucosa-based biotherapy in children (ages 3-17 years)
with AD (parts 2A and 2B). In part 1, participants will receive twice-weekly doses of CGN
biotherapy for 6 weeks, with dose escalations at 2 and 4 weeks. In part 2, participants will
receive twice-weekly doses of CGN biotherapy for 4 months, with possible dose escalations at
4 and 8 weeks (part 2A only). Starting at 12 weeks for both parts 2A and 2B, dosing frequency
may be increased to every other day. Participants in part 1 will be contacted 30 10 days
after end of treatment for assessment of safety. Participants in parts 2A and 2B will also be
followed for up to 1 year after the end of treatment for evaluation of long-term activity and
safety. This will be the first study to test cutaneous live biotherapeutic products for AD.
We hypothesize that altering the strains of CGN on the skin of people with AD will improve
the patient s clinical outcome. We do not expect serious toxicities because R mucosa is
rarely pathogenic; reported cases of bacteremia have typically been associated with
percutaneous catheters in immunocompromised patients, who are excluded from this study.

- INCLUSION CRITERIA:

Inclusion Criteria for Young Adults and Adults with AD (Part 1)

1. Age 16+ years

2. SCORAD of at least 10

3. Have a clinical diagnosis of AD with active involvement of the antecubital fossa

4. Willing to allow storage of blood for future research

5. No history of other skin disease

6. Initiated or attempted standard of care therapy at least 6 months prior to enrollment

7. Must agree to use adequate contraception (hormonal or barrier method of birth control
or abstinence) when engaging in sexual activities that can result in pregnancy. The
effects of CGN live biotherapy on the developing human fetus are unknown. Adequate
contraception must be used consistently, beginning before the first dose and lasting
for the duration of study participation. Participants of childbearing potential must
have a negative pregnancy test result before they receive CGN live biotherapy. During
the course of the study, if a participant becomes pregnant or suspects they are
pregnant, then they should inform the study staff and their primary care physician
immediately.

Inclusion Criteria for Children with AD (Part 2)

1. Age 3-16 years

2. SCORAD of at least 10

3. Have a clinical diagnosis of AD with active involvement of the antecubital fossa

4. Willing to allow storage of blood and bacterial swabs for future research

5. Initiated or attempted standard of care therapy at least 6 months prior to enrollment

6. Participants who have begun menstruating must agree to use adequate contraception
(hormonal or barrier method of birth control or abstinence) when engaging in sexual
activities that can result in pregnancy.

EXCLUSION CRITERIA:

1. Presence of an indwelling venous or arterial catheter

2. Individuals living with anyone with a diagnosed immunodeficiency, cardiac valvular
disease, and/of indwelling catheter

3. Precence of allergies to aimkacin, ciprofloxacin, gentamicin, levofloxacin, and
tobramycin (which would preclude treatment of any unexpected infection)

4. History of cardiac valvular disease

5. Any history of grade 2 or higher neutropenia or leukopenia

6. Clinical suspicion of immunodeficiency, liver disorder, kidney disorder, and/or HIV

7. Pregnant or breastfeeding

8. Any history of anti-TNF treatment

9. Inability to demonstrate proper bacteria administration procedure despite coaching and
training

10. Use of fluoroquinolone or aminoglycoside antibiotics within 2 weeks of enrollment

11. Any condition that, in the opinion of the investigator, contraindicates participation
in this Study

Co-enrollment guidelines: Co-enrollment in other trials is restricted, other than
enrollment on observational studies or those evaluating the use of a licensed medication.
Study staff should be notified of co-enrollment as it may require the approval of the
investigator.