This spontaneous report received from a patient concerned a 75 year old male. Initial information was processed along with the additional information received on 21-JAN-2022. The patient's height, and weight were not reported. The patient's past medical history included smoker, and concurrent conditions included ischemic heart disease, emphysema (held in check 14 years, as shown by pulmonary function tests remained the same), and (COPD) Chronic Obstructive Pulmonary Disease was considered 100% disabled but was okay at the time of reporting. The patient received Covid-19 vaccine ad26.cov2.s (suspension for injection, route of admin not reported, batch number: 1805020, expiry: unknown) dose was not reported, 1 total administered on 30-MAR-2021 to left arm for prophylactic vaccination. Dose number in series 1. No concomitant medications were reported. On 01-DEC-2021, the patient did not felt well. Patient went to the emergency room and was tested positive for Covid (confirmed Covid-19 infection and confirmed clinical vaccination failure) and was then sent to home. On 05-DEC-2021, patient went to the hospital due to 102.9 F (body temperature), and on the same day, he got hospitalized. Patient stated that during the first 6 to 7 days, he did not believed he was going to go home. Patient stated, it was a terrifying experience. On an unspecified date, in DEC-2021, (during hospital stay) he developed COVID pneumonia, hepatitis from drugs, problems with kidneys, infections (not sure if upper respiratory tract or urinary tract), hallucinations (saw colors but not people, went from black to greys and himself in the, then to colors but no people and happy), and picked up regular pneumonia. He was treated with antibiotics (had a reaction to both first and second ones), and also got shots in the abdomen every day to not cause clots. During hospitalization, Patient did not needed ventilator but was put on 10L oxygen therapy. Patient was bedridden during hospital stay, so he lost 17 pounds and muscle mass (stated weight was 181 pounds on discharge day). On an unspecified date, he had X-ray, which showed one lung was all white and the other one was 3/4. On 25-DEC-2021, he was sent home but he could barely walk half a mile without getting out of breath. Patient stated that physicians said he would take 9 weeks to 3 months to recover. Patient was happy because only a few weeks after discharge from hospital, he could walk if he pushed it, he would get out of breath at the time of reporting. Patient did breathing exercises and took vitamins and everything to get better. Patient stated each day it got better. Patient attributed this to vaccine, stated it might had impacted his chances of survival. Patient was hospitalized for 20 days. The action taken with covid-19 vaccine ad26.cov2.s was not applicable. The outcome of the confirmed clinical vaccination failure and Covid pneumonia was not reported. This report was serious (Hospitalization Caused / Prolonged). This report was associated with product quality complaint: 90000211650. This case, involving the same patient is linked to 20220123831. Sender's Comments: V0: 20220140794-COVID-19 VACCINE AD26.COV2.S- Covid Pneumonia. This event(s) is considered unassessable. The event(s) has a compatible/suggestive temporal relationship, is unlabeled, and has unknown scientific plausibility. There is no information on any other factors potentially associated with the event(s). 20220140794-COVID-19 VACCINE AD26.COV2.S-Confirmed clinical vaccination failure. This event(s) is considered not related. The event(s) has a compatible/suggestive temporal relationship, is unlabeled, and has unknown scientific plausibility. There are other factors more likely to be associated with the event(s) than the drug. Specifically: SPECIAL SITUATIONS.