A Trial to Learn if Dupilumab is Safe for and Helps Adult and Adolescent Participants With Eosinophilic Gastritis With or Without Eosinophilic Duodenitis

Key Inclusion Criteria:

1. Adolescent participants will only be enrolled at study sites in countries/regions aspermitted by local regulatory authorities and ethic committees (ECs)

2. Documented endoscopic biopsy supporting a pathologic diagnosis of Eosinophilicgastritis (EoG) at least 3 months prior to screening

3. Baseline endoscopic biopsies with a demonstration of eosinophilic infiltration for adiagnosis of EoG, as defined in the protocol

4. Completed at least 11 of 14 days of EoG/EoD-SQ eDiary data entry in the 2 weeksprior to the baseline visit

5. History (by patient report) of at least 2 episodes of EoG (with or without EoD)symptoms per week in 8 weeks before screening

6. For the 2 weeks prior to baseline visit, an average total symptom score (TSS) of atleast of 20 calculated using data from the EoG/EoD-SQ eDiary and an average severityscore of at least 4 (on a scale of 0-10) per week for at least 2 of the 6 symptoms,as defined in the protocol.

Key Exclusion Criteria:

1. Body weight less than 40 kg

2. Prior participation in a dupilumab clinical trial, or past or current treatment withdupilumab

3. Helicobacter pylori infection

4. Any esophageal stricture unable to be passed with a standard, diagnostic, upperendoscope or any critical esophageal stricture that requires dilation at screening

5. History of achalasia, Crohn's disease, eosinophilic colitis, ulcerative colitis,celiac disease, and prior gastric or duodenal surgery

6. Other causes of gastric and, if applicable, duodenal eosinophilia or the followingconditions: eosinophilic granulomatosis with polyangiitis (Churg-Strauss syndrome)or hyper-eosinophilic syndrome

7. History of bleeding disorders, esophageal or gastric varices that, in the opinion ofthe investigator, would put the participant at undue risk for significantcomplications from an endoscopy procedure

8. Initiation or change of a food-elimination diet regimen or re-introduction of apreviously eliminated food group in the 4 weeks prior to the screening visit.Participants on a food-elimination diet must remain on the same diet throughout thestudy

9. Planned or anticipated use of any prohibited medications and procedures during thestudy

10. Planned or anticipated major surgical procedure during the study

11. Receiving tube feeding or parenteral nutritional at screening (Part A and B).

NOTE: Other Protocol Defined Inclusion / Exclusion Criteria Apply