Please select the eligibility criteria that correspond to the clinical trial below.
Title: Multi-center, Multi-national, Randomized, Placebo-Controlled Trial of Azithromycin in Subjects With Cystic Fibrosis 6-18 Years Old, Culture Negative for Pseudomonas Aeruginosa
Brief Summary: This is a study to examine the safety, effect on lung function, and frequency of symptoms relating to cystic fibrosis during 24 weeks of treatment with the antibiotic azithromycin in 6-18 year-olds with CF who are not infected with Pseudomonas aeruginosa.


Options:
A: Inclusion Criteria:

* Males or females aged 6 years and older
* Subjects with CF as diagnosed by one of the following: documented sweat chloride \>= 60 mEq/L by quantitative pilocarpine iontophoresis test, or documented sweat sodium \>= 60 mmol/L, or 2 well characterized genetic mutations in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene, or abnormal nasal potential difference with accompanying symptoms characteristic of CF
* Documented PA in an expectorated sputum or throat swab culture within 3 months prior to Visit 1 or at Visit 1
* Subjects must be able to provide written informed consent/assent prior to any study related procedures; parent/guardian must be able to give written informed consent as necessary prior to any study related procedure
* Subjects must have received previous treatment with aerosolized antibiotics without demonstration of drug intolerance
* FEV1 \<= 75% predicted at Visit 1
* Ability to perform reproducible pulmonary function tests
* Chest radiograph at Visit 1 without significant acute findings (eg, infiltrates \[lobar or diffuse interstitial\], pleural effusion, pneumothorax); or chest radiograph or magnetic resonance image (MRI) obtained within the 180 days prior to Visit 1 without acute findings and no significant intercurrent illness; chronic, stable findings (eg, chronic scarring or atelectasis) are allowed

Exclusion Criteria:

* Current use of oral corticosteroids in doses exceeding the equivalent of 10 mg prednisone a day or 20 mg prednisone every other day
* History of sputum or throat swab culture yielding B. cepacia in the previous 2 years
* Current requirement for daily continuous oxygen supplementation or requirement for more than 2 L/minute at night
* Administration of any investigational drug or device within 28 days of Visit 1 or within 6 half-lives of the investigational drug (whichever is longer)
* Known local or systemic hypersensitivity to monobactam antibiotics
* Known allergies/intolerance to tobramycin
* Inability to tolerate inhalation of a short acting beta agonist
* Changes in or initiation of chronic azithromycin treatment within 28 days prior to Visit 1
* Administration of antipseudomonal antibiotics by inhalation, intravenous or oral routes within the 14 days prior to Randomization/Visit 2
* Changes in antimicrobial, bronchodilator (BD), dornase alfa, or corticosteroid medications within 7 days prior to Visit 1
* Changes in physiotherapy technique or schedule within 7 days prior to Visit 1
* History of lung transplantation
* Abnormal renal or hepatic function or serum chemistry at Visit 1, defined as aspartate aminotransferase (AST), alanine aminotransferase (ALT) \> 5 times upper limit of normal range (ULN) or creatinine \> 2 times ULN
* Positive pregnancy test at Visit 1; all women of childbearing potential will be tested
* Female of childbearing potential who is lactating or is not (in the opinion of the investigator) practicing an acceptable method of birth control; female subjects who utilize hormonal contraceptives as one of their birth control methods must have used the same method for at least 3 months before study dosing
* Any serious or active medical or psychiatric illness, which in the opinion of the investigator, would interfere with patient treatment, assessment, or compliance with the protocol
B: Inclusion Criteria:

1. Children of either sex with a diagnosis of CF following detection via New Born Screening (NBS) for cystic fibrosis
2. Participants who, in the opinion of the Investigator, are able to comply with the protocol for its duration
3. Written informed consent signed and dated by parent/legal guardian according to local regulations

Exclusion Criteria:

1. Born \<30 weeks gestation
2. Prolonged mechanical ventilation in the first 3 months of life
3. Participation in another randomized controlled trial within the 3 months preceding inclusion in this study
4. A significant medical disease or condition other than CF that is likely to interfere with the child's ability to complete the entire protocol
5. Previous major surgery except for meconium ileus
6. Macrolide hypersensitivity
C: Inclusion Criteria:

* Male or female, 6-18 years of age at enrollment
* Confirmed diagnosis of CF
* Written informed consent (and assent when applicable)
* Clinically stable at enrollment as assessed by the site investigator
* FEV1 % predicted \> 50%
* Ability to comply with medication use, study visits, and study procedures
* Ability to swallow a 250 mg tablet

Exclusion Criteria:

* Weight less than 18.0 kg
* Respiratory culture positive for P. aeruginosa, NTM, or B. cepacia complex within 1 year or at screening, or AFB positive at screening
* Allergy to macrolide antibiotics
* Use of macrolide antibiotics (e.g., azithromycin, clarithromycin) within 60 days of screening
* Use of systemic corticosteroids or intravenous or oral antibiotics within 14 days of screening
* Initiation of high dose ibuprofen, Pulmozyme®, hypertonic saline or aerosolized antibiotics within 30 days of screening
* Chronic therapy with drugs known to have rare but serious interactions with azithromycin: amiodarone, digoxin, disopyramide, lovastatin, pimozide, rifabutin, and nelfinavir
* Investigational drug use within 30 days of screening
* Laboratory abnormalities (creatinine, liver function or neutropenia) at screening and confirmed at follow-up testing prior to randomization
* History of biliary cirrhosis, portal hypertension, or splenomegaly, or splenomegaly on physical exam
* History of ventricular arrhythmia
* Other major organ dysfunction, excluding pancreatic dysfunction
* History of lung transplantation or currently on lung transplant list
* Relative decrease in FEV1 % predicted ≥ 20% between the screening and enrollment visit
* Positive serum pregnancy test at screening
* Pregnant, breastfeeding, or if post-menarche female, unwilling to practice birth control during participation in the study
* History of alcohol, illicit drug or medication abuse within 1 year of screening in the judgment of the site investigator
* Presence of a condition or abnormality that in the opinion of the site investigator would compromise the safety of the subject or the quality of the data
D: Inclusion Criteria:

* Age ≥ 6 months to ≤ 18 years
* Documentation of a CF diagnosis as evidenced by one or more clinical features consistent with the CF phenotype or positive CF Newborn Screening result for immunoreactive trypsinogen (IRT) IRT/DNA or IRT/IRT and one or more of the following criteria:
* sweat chloride ≥ 60 milliequivalent (mEq)/liter by quantitative by pilocarpine iontophoresis test (QPIT)
* two well-characterized mutations in the cystic fibrosis transmembrane conductive regulator (CFTR) gene
* Abnormal nasal potential difference (NPD) (change in NPD in response to a low chloride solution and isoproteronol of less than - 5 mV)
* Documented new positive oropharyngeal, sputum or lower respiratory tract culture for Pa within 30 days of the Baseline Visit (Visit 1), defined as: a) first lifetime documented Pa positive culture; or b) Pa recovered after at least a two-year history of Pa negative respiratory cultures (≥ 1 culture/ year)
* Clinically stable with no evidence of any significant respiratory symptoms at the Baseline Visit that would require administration of intravenous anti- pseudomonal antibiotics, oxygen supplementation, and/or hospitalization as determined by the study physician
* Written informed consent obtained from participant or participant's legal representative (and assent when applicable) and ability for participant to comply with the requirements of the study

Exclusion Criteria:

* Macrolide antibiotic use within 30 days of the Baseline Visit
* Initiation of current course of treatment with TIS \>14 days prior to Baseline Visit
* Weight \<6.0 kg at the Baseline Visit
* History of aminoglycoside hypersensitivity or adverse reaction to inhaled aminoglycoside
* History of azithromycin hypersensitivity or adverse reaction to azithromycin or allergy to macrolide antibiotics
* History of positive respiratory culture for Non-tuberculous mycobacteria (NTM) or Burkholderia cepacia complex within 2 years of the Baseline Visit
* History of unresolved, abnormal renal function (defined as serum creatinine greater than 1.5 times the upper limit of normal for age).
* History of unresolved, abnormal liver function tests (defined as alanine aminotransferase (ALT) and/or aspartate aminotransferase (AST) greater than 4 times the upper limit of normal range) or history of portal hypertension
* History of unresolved, abnormal neutropenia (ANC ≤ 1000)
* Abnormal ECG test at the Baseline Visit defined as a QT interval corrected (QTc) (B) of ≥460 msec or history of ventricular arrhythmia
* History of abnormal hearing sensitivity defined as hearing threshold levels \>25 dB HL (decibels Hearing Level) for visual reinforcement audiometry (VRA) at any frequency (500-4000Hz) or \>20 Decibels Hearing Level (dBHL) for play or standard audiometry at any two frequencies (500-8000Hz) in either ear, not associated with middle ear disease (including infection) or a flat (Type B) tympanogram
* New initiation of chronic therapy (greater than 21 days) with drugs known to prolong QT interval (refer to Appendix III) within 30 days prior to the Baseline Visit or coadministration of nelfinavir or oral anticoagulants
* Positive serum or urine pregnancy test at the Baseline Visit (to be performed on all females of child-bearing potential) or for females of child bearing potential: pregnant, breastfeeding, or unwilling to use barrier contraception during participation in the study
* Administration of any investigational drug within 30 days prior to the Baseline Visit
* Presence of a condition or abnormality (e.g., pre-existing heart disease) that in the opinion of the site investigator would compromise the safety of the participant or the quality of the data

Answer: C