ENTEROVIRUS INFECTION WHICH IS VERY SIMILAR TO COVID; CHOKING; SEVERE PAIN IN BACK; VISION GOT BLURRY/EYESIGHT PROBLEM; SEVERE BRAIN FOG; DEPRESSION; DIGESTION PROBLEMS; INABILITY TO EXERCISE; FIERY PAIN AND REALLY SEVERE INFLAMMATION PAIN; REAL SEVERE BURNING; HAVING A HARD TIME BREATHING; HAD A SEVERE REACTION; HAS INCCORDINATION; ARTHRITIS PAIN SO SEVERE IT FELT LIKE SOMEONE POURED GAS ON ALL OF CALLER'S JOINTS AND LIT THEM ON FIRE; MUSCLE WEAKNESS; EXTREME/CHRONIC FATIGUE; HEADACHE; This spontaneous report received from a patient other manufacturer (Pfizer) and concerned a patient of unspecified age and sex. The patient's height, and weight were not reported. The patient's past medical history included: long haul covid (start date on unspecified date in 2020 and was there for 3 years), and concurrent conditions included: HIV positive (Patient was taking HIV medications), and enterovirus infection (Patient had a Covid like infection (enterovirus infection) and thought was born with it. The infection became active when patient was 13 years old). The patient previously received covid-19 vaccine ad26.cov2.s (dose number in series 1) (suspension for injection, route of admin, batch number and expiry date were not reported) dose was not reported, 1 total administered on unspecified date for covid-19 prophylaxis.  It was unknown whether patient had any adverse events following vaccination with first dose of covid-19 vaccine ad26.cov2.s (Dose number in series 1). The patient additionally received covid-19 vaccine ad26.cov2.s (dose number in series 2) (suspension for injection, route of admin not reported, batch number and expiry date were not reported)) dose was not reported, 1 total administered on an unspecified date for covid-19 prophylaxis (dose number in series 2). The batch number was not reported. The Company is unable to perform follow-up to request batch/lot numbers. On unspecified date, the patient received non-company suspect drug Paxlovid (nirmatrelvir/ritonavir) (form of admin, route of admin were not reported, batch number and expiry date were not reported) for enterovirus infection. No concomitant medications were reported. On an unspecified date, patient had a severe reaction and got way sicker (dose number in series 2) after administration of covid-19 vaccine ad26.cov2.s (dose number in series 2). On an unspecified date, the patient experienced enterovirus infection which is very similar to covid (dose number in series 2). The patient was on Paxlovid for 23 days. After Paxlovid administration, patient was able to have more energy, was able to think clear and headache was cleared (dose number in series 2). Paxlovid worked 100%. With Paxlovid, within 6 hours of the first dose all of the Arthritis pain was completely gone and eye site got clearer with Paxlovid. On an unspecified date, the patient got off Paxlovid and experienced severe pain in back, extreme/chronic fatigue, short term memory loss/forgetful again, vision got blurry/eyesight problem, severe brain fog, mental confusion, depression and anxiety, choking and had a hard time breathing, digestion problems, muscle weakness, inability to exercise and arthritis pain so severe it felt like someone poured gas on all of patient's joints and lit them on fire (dose number in series 2). On an unspecified date, the patient had really severe inflammation and real severe burning which has not come back (dose number in series 2). The patient had been off Paxlovid for a week to 10 days. The doctor said doctor was not going to prescribe the Paxlovid anymore for patient because the doctor might get in trouble, hence could not prescribe anymore. When the patient was taking Paxlovid, patient hadn't felt that good since caller was 12 years old. Off Paxlovid, the symptoms came back and could not think real clearly again. The fiery pain and really severe inflammation pain (dose number in series 2) had not come back. The patient's singing voice came back and also ability to play piano came back extremely well. The patient had incoordination (dose number in series 2). The patient's balance go off started to get forgetful again (dose number in series 2). The patient stated that Paxlovid could treat arthritis, chronic fatigue, and eye site problems potentially. Laboratory data (dates unspecified) included: Liver function test normal No abnormalities, and Renal function test normal No abnormalities. The action taken with covid-19 vaccine ad26.cov2.s was not applicable; and action taken with nirmatrelvir/ritonavir was not reported. The patient recovered from fiery pain and really severe inflammation pain, and real severe burning, and had not recovered from enterovirus infection which is very similar to covid, severe pain in back, extreme/chronic fatigue, vision got blurry/eyesight problem, severe brain fog, depression, digestion problems, muscle weakness, inability to exercise, arthritis pain so severe it felt like someone poured gas on all of caller's joints and lit them on fire, choking, had a severe reaction, headache, has inccordination, and having a hard time breathing. This report was serious (Other Medically Important Condition).; Sender's Comments: V0: 20230960423- enterovirus infection which is very similar to covid, choking. The event has an unknown/unclear temporal relationship, is unlabeled, and has unknown scientific plausibility. There is no information on any other factors potentially associated with the event. Therefore, the WHO Causality is considered indeterminate. The company causality is considered unassessable.