Adverse effect of the vaccine/COVID syndrome; Tracheitis; Heaviness in her chest; Mucous; Throat feels like it's suffocating/base of my throat can't close properly; Difficulty breathing/much worse/breathing was desperately worse/can't breathe properly; Difficulty breathing/can't breathe properly; This spontaneous case was reported by a patient and describes the occurrence of DYSPNOEA (Difficulty breathing/can't breathe properly), CONDITION AGGRAVATED (Difficulty breathing/much worse/breathing was desperately worse/can't breathe properly), IMMUNISATION REACTION (Adverse effect of the vaccine/COVID syndrome), TRACHEITIS (Tracheitis) and CHEST DISCOMFORT (Heaviness in her chest) in a 77-year-old female patient who received mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (batch no. AS7144B) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Seasonal asthma (like weather related), Blood pressure high, Cholesterol, Penicillin allergy, Allergy to chemicals, Drug allergy and Seasonal allergy. Concomitant products included PREDNISONE and ALBUTEROL [SALBUTAMOL] for an unknown indication.    On 16-Sep-2022, the patient received dose of mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (unknown route) 1 dosage form. On 19-Sep-2022, the patient experienced DYSPNOEA (Difficulty breathing/can't breathe properly). On 20-Sep-2022, the patient experienced CONDITION AGGRAVATED (Difficulty breathing/much worse/breathing was desperately worse/can't breathe properly). On an unknown date, the patient experienced IMMUNISATION REACTION (Adverse effect of the vaccine/COVID syndrome), TRACHEITIS (Tracheitis), CHEST DISCOMFORT (Heaviness in her chest), SECRETION DISCHARGE (Mucous) and SUFFOCATION FEELING (Throat feels like it's suffocating/base of my throat can't close properly). The patient was treated with PREDNISONE (intravenous) at an unspecified dose and frequency and PREDNISONE (oral) at an unspecified dose and frequency. At the time of the report, DYSPNOEA (Difficulty breathing/can't breathe properly) and CONDITION AGGRAVATED (Difficulty breathing/much worse/breathing was desperately worse/can't breathe properly) had not resolved and IMMUNISATION REACTION (Adverse effect of the vaccine/COVID syndrome), TRACHEITIS (Tracheitis), CHEST DISCOMFORT (Heaviness in her chest), SECRETION DISCHARGE (Mucous) and SUFFOCATION FEELING (Throat feels like it's suffocating/base of my throat can't close properly) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Chest X-ray: Fine. On an unknown date, Heart rate: Fine. On an unknown date, Oxygen saturation: Fine.         Patient did not ever have COVID positive test or diagnosis. Patient did not give other vaccines within 1 month prior to Moderna COVID-19 vaccine. Patient was on steroid inhalations. On 25-Mar-2021, patient received J and J vaccine dose 1 for COVID-19 vaccine, Lot number 1805031. On 11-Dec-2021, patient received Moderna 1st booster. The patient googled the website and looked for the side effects from the bivalent booster shot. Patient took the shot on 16-Sep-2022. By Monday, patient had difficulty breathing. By Tuesday, it was much worse. Patient called her physician, who put her on prednisone. Patient felt ok, but on Wednesday, patients breathing was desperately worse. Later, put patient on an antibiotic. By Friday, patient was at the hospital. Patient was seen in the emergency room and treated with IV prednisone and inhalation treatment. They told patient that had an adverse effect of the vaccine. They were treating it as a COVID syndrome. Patient did not have COVID, but breathing was not listed. It started out as tracheitis, but there was a heaviness in patient's chest. It came and went. Sometimes patient could breathe, but sometimes patient throat felt like it was suffocating. She had an appointment to see a pulmonologist. The patient stated the hospital told her she was fine on everything that patient's oxygen, heart rate, chest x-ray there was nothing could do for her. Patient just could breathe properly. The base of patient's throat felt like it did not close properly.   This case was linked to US-MODERNATX, INC.-MOD-2022-650926 (E2B Linked Report).; Sender's Comments:  US-MODERNATX, INC.-MOD-2022-650926:(Same Reporter)