Chills; his platelets were down; This is a spontaneous report from a contactable consumer or other non hcp. A 56-years-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection), dose 2 via an unspecified route of administration, in Arm Right on an unspecified date in Mar2021 (at the age of 56 years old) (Batch/Lot number was not reported) as single dose for COVID-19 immunisation. Medical history included cancer from Mar2020 to Oct2020, ongoing lymphoedema from an unspecified date in 2020, ongoing High blood pressure diagnosed 2-3 years ago, ongoing Allergies, white Coat syndrome. Previously the patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection), dose 1 in right arm on an unspecified date in Mar2021 (at the age of 56 years old) as single dose for COVID-19 immunisation and experienced no reactions, Pneumonial vaccine and FLU Shot for an unknown indication and experienced no reaction on previous exposure to Vaccine. Caller reported that his dad passed away when he was 83 and after they found cancer on his bladder. Caller reported that no one in his family has immune problems, other than his daughter who has type I diabetes. Concomitant medications included Loratidine (CLARITINE) taken for hypersensitivity from 20May2021 and ongoing, potassium chloride taken for lymphoedema from an unspecified date in 2020, lisinopril for hypertension, Terbinafine for toenail fungus for the last month and a half. On an unspecified date in Mar2021, the patient experienced some chills on the second day following his second dose of the Covid-19 vaccine. Caller reported that he was not running a fever or anything, just felt chills and that was about it. Caller reported that then everything was fine, he just experienced chills for one day. The patient received both doses of the Pfizer BioNTech COVID-19 Vaccine in Mar2021. Last year he had cancer. He is now part of a study with (withheld). As part of the study, they have been doing blood work (three times now). His antibody test for COVID-19 came negative. Caller mentioned his platelets were at 118, he had no sign of cancer on scan at end of Oct2020 (he is in remission) and reported lymphedema in one leg. Caller stated that he is aware that Pfizer conducted a study with healthy individuals. Caller wants to know if Pfizer is conducting a study with patients who have received both doses of the Pfizer BioNTech COVID-19 vaccine and who have comorbidities such as transplant patients, or patients with cancer to see how the antibodies of the vaccine are affecting them because he would be interested to participate. Caller reported that his platelets and white blood cells are still low, and his physicians did biopsies to make sure there was no bone marrow cancer. Caller reported that his physician did notice that the bone marrow that makes platelets was really taking its time getting back. Caller reported that his last report showed 118 on platelets. Caller reported that his physician informed him that he developed lymphedema from the cancer medication that he was taking. Caller reported that his physician informed him that the cancer medication can kill cancer but can attack other parts of the body. Caller did not provide details for the medication he was taking for his cancer. Caller reported that they had checked his legs to make sure that he didn't have any blood clots. Caller stated that he needs to know if Pfizer is having something that determines if someone has antibodies for Covid-19. Caller stated that Pfizer put out that the Covid-19 vaccine is 80 something percent effective after having the vaccine. Caller reported that they were looking into people that have had immune diseases and immunity disorders. Caller reported that he is out of the cancer and doesn't have anything showing that his body has cancer, whether bloodwork or all that. Caller stated that he would really like to know if he has antibodies from the Covid-19 vaccine or if he doesn't. Caller reported that he is worried that there is no way of checking to see if he has antibodies from the Covid-19 vaccine. Caller inquired how he can find out if he has antibodies to Covid-19 besides a little kip that you put a few drops of blood on and put a solution on it. Caller reported that his weight was higher and that after he found out he had cancer, it started to go down. Caller reported that he has no other symptoms, he is not diabetic, and doesn't have any kind of immunity or other symptoms. Caller reported that the only thing stopping him from going back to work was going through cancer, his doctor didn't let him go back. Caller reported that he was at risk because his platelets were down, meaning that he could be susceptible to even the common cold. Caller reported that his physician let him go back to work a week after the first dose of the Covid-19 vaccine. Caller reported that his physician informed him that more than likely the caller had a little in one of his legs that didn't show up as there wasn't swelling or doing enough to cause it. Caller reported that he just wears compression socks now and there was no damage. Caller reported that the lymphedema started during his cancer. Caller reported that while he was getting chemo, his ankles were starting to get swollen and it was determined towards the end of his cancer that it was lymphedema. Caller reported that he heard someone saying something about the possibility that people may need to take boosters of the Covid-19 vaccine. Caller reported that he heard about delta versions of the Covid-19 virus. Caller reported that they say that if you had both doses of the Covid-19 vaccine, you're covered whereas if you only had one, you're not as covered. Caller reported that he has had several Covid-19 antibody tests performed since he received the first and second dose of the Covid-19 vaccine and they have all come back negative. Caller reported that the most recent result was from today, 15Jun2021. No additional Vaccines were administered on Same Date of the Pfizer Suspect. No adverse events following prior vaccinations. The reporter considered the events as non-serious. The patient underwent lab tests and procedures which included platelet count: 118 on an unspecified date (his platelets are still low), sars-cov-2 antibody test negative: negative on 15Jun2021, white blood cell count: low on an unspecified date (white blood cells are still low). The outcome of chills was recovered on an unspecified date in Mar2021 and platelet count decreased was unknown.  Information about batch/Lot number has been requested.