Oxygen level goes below 90; Wheezing; Difficulty breathing / Shortness of breath on exertion; Congested cough; Got very sick; This spontaneous case  was received on 12-Oct-2021 from other non-health professional (consumer) via Med Communications (reference number: SEQW21-03777) and concerned a 66-year-old, female patient.  The patient's concurrent conditions included allergy to dairy (milk products) and pneumonia vaccine, type II diabetes, high blood pressure and chronic pain. The patient's concomitant medications were not reported. The patient's historical vaccine included influenza virus vaccine in 2020 (reported as last year), after which the patient experienced the same symptoms as reported in this case (she was sick, experienced difficulty breathing, shortness of breath on exertion, wheezing, congested cough for ten months and her oxygen level was below 90).   On 20-Sep-2021, the patient was vaccinated with influenza virus vaccine polyvalent (brand not specified; dose, route of administration and anatomical location: not reported) to prevent influenza. The batch number was not reported. The patient was not sure which Seqirus shot she received.   On an unspecified date in Oct-2021, two and half weeks after receiving influenza virus vaccine polyvalent, the patient got very sick. She experienced difficulty breathing, shortness of breath on exertion, wheezing, congested cough and her oxygen level was below 90. The patient stated that the same thing happened last year, after getting the flu vaccine and all the symptoms cleared up until she received this year's flu vaccine.   On an unspecified date in Oct-2021, the patient was treated with prednisone and unspecified cough medication. Also, the patient had a computerised tomography scan (CAT scan) and it was normal and did an allergy test and results showed that she was allergic to dairy (milk products).  At the time of initial reporting, the patient had not recovered from the events.   The reporter did not provide causality assessment.  The case is linked to case 202103715 (the same patient).  The reporter assessed all events as serious.  Company comment: A 66-year-old patient was vaccinated with influenza virus vaccine polyvalent. Two and half weeks after receiving influenza virus vaccine polyvalent, the patient got very sick and experienced dyspnoea, shortness of breath on exertion, wheezing, congested cough and her oxygen level went below 90. The patient stated that the same thing happened last year, after getting the flu vaccine and all the symptoms cleared up until she received this year's flu vaccine. Due lack of information regarding diagnostic findings, causality is unassessable for all events.; Sender's Comments: A 66-year-old patient was vaccinated with influenza virus vaccine polyvalent. Two and half weeks after receiving influenza virus vaccine polyvalent, the patient got very sick and experienced dyspnoea, shortness of breath on exertion, wheezing, congested cough and her oxygen level went below 90. The patient stated that the same thing happened last year, after getting the flu vaccine and all the symptoms cleared up until she received this year's flu vaccine. Due lack of information regarding diagnostic findings, causality is unassessable for all events.