Streamlined Treatment of Pulmonary Exacerbations in Pediatrics

Prior treatment

• Receiving an acute course of oral or IV antibiotics at the time of enrollment or within the 14 days prior to enrollment. Individuals may be re-screened ≥21 days after completion of antibiotics if they are at their baseline state of health, per self-report
• Treatment with systemic corticosteroids at enrollment or within the 14 days prior to enrollment. Individuals may be re- screened ≥21 days after completion of systemic corticosteroids if they are at their clinical baseline, per self-report
• History of positive culture for Mycobacterium abscessus in the 12 months prior to enrollment
• Treatment with antibiotics for any non-tuberculous mycobacteria (NTM) at enrollment
• Three or more IV antibiotic-treated PEx in the 12 months prior to enrollment
• Treatment with chronic oral antibiotics other than azithromycin at enrollment
• Treatment with systemic corticosteroids for allergic bronchopulmonary aspergillosis (ABPA) in the 12 months prior to enrollment

Other illness

• Presence of a condition or abnormality that in the opinion of the Investigator would compromise the safety of the individual or the quality of the data
• History of solid organ transplant

• Age
  • For main cohort and non-HEMT cohort: age 6 to \<19 years
  • For preschool cohort: age 3 to \<6 years
• Documentation of a CF diagnosis as evidenced by one or more clinical features consistent with the CF phenotype and one or more of the following criteria:
  • sweat chloride ≥ 60 mEq/liter
  • two disease-causing variants in the cystic fibrosis transmembrane conductive regulator (CFTR) gene
• Written informed consent (and assent when applicable) obtained from participant or participant's legal representative and ability of participant to comply with the requirements of the study
• Highly Effective Modulator Therapy
  • For main cohort and preschool cohort: Taking HEMT for at least 3 months at enrollment
  • For non-HEMT cohort: not eligible for HEMT based on CFTR genotype or eligible but not taking for at least 3 months and no plans to start HEMT in the next year, and also not taking tezacaftor-ivacaftor or lumacaftor-ivacaftor for at least 3 months
• For main cohort and non-HEMT cohort: able to perform acceptable and reproducible spirometry
• For main cohort and non-HEMT cohort: ppFEV1 ≥ 50% predicted at enrollment based on the Global lung Initiative (GLI) reference equations
• Ability to receive text messages and access the internet