get sick infected/Repetitive infections; Immediately after he got the Pfizer Covid Vaccine he was feeling very unwell; Left leg started cramping, clotting, definitely thrombosis in his leg and body; seems like hardening of the heart; fatigue; His immunity is messed up; being infected in the nose and throat, constantly infected in the nose over and over again; being infected in the nose and throat, constantly infected in the nose over and over again; felt uneasy; worst declined in health; he could hardly breathe; the first dose of COVID-19 vaccine (Moderna); the first dose of COVID-19 vaccine (Moderna); definitely thrombosis in his leg and body; left leg is having clotting, deep vein thrombosis; chest pain; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 26 year-old male patient received bnt162b2 (BNT162B2), administered in arm right, administration date 18Nov2021 (Lot number: FH8028) at the age of 26 years as dose 2 (initial pfizer dose), single for covid-19 immunisation. Relevant medical history included: "Addiction" (unspecified if ongoing), notes: He has battled with addictions and other dysfunctional behaviors.; "Dysfunctional behaviors" (unspecified if ongoing), notes: He has battled with addictions and other dysfunctional behaviors. There were no concomitant medications. Vaccination history included: Moderna covid vaccine (Dose 1, Batch/lot number :017C21A, injection to left arm at 11:00), administration date: 18Oct2021, when the patient was 26 years old, for COVID-19 immunisation, reaction(s): "injection site on arm painful". The following information was reported: THROMBOSIS (disability, medically significant) with onset 2021, outcome "unknown", described as "definitely thrombosis in his leg and body"; DEEP VEIN THROMBOSIS (disability, medically significant) with onset 2021, outcome "unknown", described as "left leg is having clotting, deep vein thrombosis"; CHEST PAIN (disability) with onset 2021, outcome "not recovered", described as "chest pain"; INFECTION (disability), outcome "not recovered", described as "get sick infected/Repetitive infections"; MALAISE (disability), outcome "not recovered", described as "Immediately after he got the Pfizer Covid Vaccine he was feeling very unwell"; MUSCLE SPASMS (non-serious), outcome "not recovered", described as "Left leg started cramping, clotting, definitely thrombosis in his leg and body"; CARDIAC DISORDER (non-serious), outcome "not recovered", described as "seems like hardening of the heart"; FATIGUE (non-serious), outcome "not recovered", described as "fatigue"; IMMUNE SYSTEM DISORDER (non-serious), outcome "not recovered", described as "His immunity is messed up"; RHINITIS (non-serious), PHARYNGITIS (non-serious), outcome "not recovered" and all described as "being infected in the nose and throat, constantly infected in the nose over and over again"; DYSPNOEA (non-serious) with onset Jan2022, outcome "not recovered", described as "he could hardly breathe"; ANXIETY (non-serious), outcome "not recovered", described as "felt uneasy"; GENERAL PHYSICAL HEALTH DETERIORATION (non-serious), outcome "not recovered", described as "worst declined in health"; INTERCHANGE OF VACCINE PRODUCTS (non-serious) with onset 18Nov2021, outcome "unknown", described as "the first dose of COVID-19 vaccine (Moderna)". His symptoms, which were very bad, after receiving the second dose of COVID-19 vaccine (Pfizer COVID-19 vaccine on 18Nov2021) and the first dose of COVID-19 vaccine (Moderna). Patient made a mistake, because he was going for his second primary second 2 of 2-dose follow up vaccine dose and he was not paying attention because the first one was in October, four months or three months ago, of Moderna. Patient thought he got the Pfizer patient didnt see Moderna and he had lost his vaccine card and didnt remember. The lady didn't even check, she had no way of knowing at the pharmacy nobody checked and they just administered the incorrect second dose. After patient got his second incorrect vaccine, mixed batch, patient was having severe side effects and today he was still incapacitated, his left leg was having clotting, deep vein thrombosis, and lot of chest pain, and just sick over and over patient get sick infected but testing negative for COVID. He has been testing negative for COVID but his left leg is having clotting and deep vein thrombosis and he also has chest pain over and over. He clarified that his first dose, the Moderna Covid Vaccine, was administered while he was hospitalized in a local hospital for mental health issues. The Moderna Covid Vaccine was very beneficial to him, he personally had little to no side effects. He explained that the long COVID and the repetitive infections he has had since then, he is not contagious and is testing negative; but is suffering a lot of long term COVID symptoms. Immediately after he got the Pfizer Covid Vaccine he was feeling very unwell, it is supposed to be like this because its stronger the second round. He is suffering tremendously. He still feels, like nights ago his left leg started cramping, clotting, definitely thrombosis in his leg and body. He was monitoring closely to watch after the first dose the Moderna Covid Vaccine he was quite well, just fine, hardly any, barely, just a little achy, injection site on arm painful for a few days; nothing like what he was having since Pfizer Covid Vaccine with the chest pains, thrombosis in legs, clotting in his legs, thighs and calves. He is unable to get out of bed. He is repetitively getting infected with COVID. Within minutes he felt uneasy, like why is this not cooling down already, its been 30 minutes or 1 hour and this was weeks before Christmas. He was bedridden throughout New Years and Christmas and just constantly trying to manage in mind or sight. The chest pain was so severe 24Jan2022 he could hardly breathe; he had to gather his composure because he felt like he was going to fall to the floor because the chest pain was so sharp. Then it seems like hardening of the heart and cramping in his legs, fatigue and being infected in the nose and throat, constantly infected in the nose over and over again. His immunity is messed up, not the same as when he first got the first shot, the Moderna Covid Vaccine, from before he got the Moderna Covid Vaccine his immunity was noticeably affected. To some extent he did get sick on several occasions but he noticed when he got better and recovered, he had good strong lasting effects after the Moderna Covid Vaccine. Definitely in the last few weeks he has had the absolutely worst declined in health. From his understanding, the incorrect administration scared him to a whole other level. He thinks it is just long COVID. He hopes to fix the cells incorrectly vaccinated. The symptoms every moment are agonizing and torturing. The patient underwent the following laboratory tests and procedures: sars-cov-2 test: negative, notes: he is not contagious and is testing negative; but is suffering a lot of long term COVID symptoms.  No follow-up attempts are possible. No further information is expected.