An observational study in Conjunctivitis Allergic, sponsored by Regeneron Pharmaceuticals. Not yet recruiting. Open to participants aged 5 Years and older. Per ClinicalTrials.gov, last updated 2026-07-17.
Sponsored by Regeneron Pharmaceuticals · Observational
The purpose of this Patient Identification and Characterization (PIC) study is to collect information and perform limited allergy-related procedures to determine if participants can qualify for cat and/or birch tree pollen allergy clinical research studies in the future. The study is also looking at how cat and/or birch tree pollen allergies have affected overall health.
210 studies on the registry are indexed under Conjunctivitis, Allergic; 18 are open to participants now.
This study's planned enrollment of 1,500 is above the median of 107 across 28 observational studies indexed under Conjunctivitis, Allergic.
Browse Conjunctivitis, Allergic studies →Regeneron Pharmaceuticals is the lead sponsor of 411 studies on the registry; 90 are open to participants now.
Of its 125 completed or terminated interventional studies of FDA-regulated products, 79 (63%) have results posted.
Counted across the registry records on this site, refreshed daily.
This study will enroll adult and pediatric (aged ≥5 to \<18 years) participants with cat and/or birch allergen induced allergic conjunctivitis with or without allergic rhinitis
Key Inclusion Criteria:
Key Exclusion Criteria:
Note: Other Protocol Defined Inclusion/ Exclusion Criteria Apply
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cat allergy
Other: Noninterventional
Birch allergy
Other: Noninterventional
No investigational medicinal products will be administered in this study.
Proportion of participants with moderate-to-severe allergic conjunctivitis due to cat allergy who report "very bothered" or "extremely bothered" by allergic symptoms upon exposure to cat and/or cat hair/dander
Part A
Time frame: At visit 1, up to 30 days
Proportion of participants with moderate-to-severe allergic conjunctivitis due to birch tree pollen allergy who report "very bothered" or "extremely bothered" by allergic symptoms
Part B
Time frame: At visit 1, up to 30 days
Proportion of participants who report "very bothered" or "extremely bothered" by allergic symptoms upon exposure to cat and/or cat hair/dander
Part A
Time frame: At visit 1, up to 30 days
Proportions of participants who report "very bothered" or "extremely bothered" by allergic symptoms due to birch tree pollen
Part B
Time frame: At visit 1, up to 30 days
No study locations are listed for this record.
Plan to share: No
No publications or documents are linked to this record.
This study is not yet recruiting, as verified in Jul 2026. You cannot join it, but the record below documents what was studied.
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