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"Nasal congestion and difficulty breathing?"

It is unlikely that the symptoms described are related to the vaccine, especially if it was received a month ago. Nasal congestion and difficulty breathing could be caused by allergies. If the symptoms persist, worsen, or become more frequent, it is recommended to consult a doctor. Taking an antihistamine like Reactine may provide some relief for seasonal allergies, but it may take 3 to 5 days for the maximum effect to be seen.