My wife and I were sick; Got half dose for the booster; I was symptomatic infected my wife. Infected my daughter. her Boyfriend; This spontaneous case was reported by a physician and describes the occurrence of ILLNESS (My wife and I were sick), COVID-19 (I was symptomatic infected my wife. Infected my daughter. her Boyfriend) and UNDERDOSE (Got half dose for the booster) in an adult male patient who received SPIKEVAX NOS (SPIKEVAX NOS) for COVID-19 prophylaxis.    Co-suspect products included non-company products TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) for an unknown indication and COVID-19 VACCINE for an unknown indication.    No Medical History information was reported.   On an unknown date, the patient received dose of SPIKEVAX NOS (SPIKEVAX NOS) (unknown route) 1 dosage form On an unknown date, received dose of SPIKEVAX NOS (SPIKEVAX NOS) (unknown route) dosage was changed to 1 dosage form, dose of TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) (unknown route) 1 dosage form, dose of TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) (unknown route) dosage was changed to 1 dosage form, dose of TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) (unknown route) dosage was changed to 1 dosage form, dose of TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) (unknown route) dosage was changed to 1 dosage form, dose of TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) (unknown route) dosage was changed to 1 dosage form and dose of TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE) (unknown route) dosage was changed to 1 dosage form. and dose of COVID-19 VACCINE (unknown route) 1 dosage form. In December 2022, the patient experienced COVID-19 (I was symptomatic infected my wife. Infected my daughter. her Boyfriend). On an unknown date, the patient experienced ILLNESS (My wife and I were sick) and UNDERDOSE (Got half dose for the booster). The patient was treated with NIRMATRELVIR, RITONAVIR (PAXLOVID) at an unspecified dose and frequency. At the time of the report, ILLNESS (My wife and I were sick) and COVID-19 (I was symptomatic infected my wife. Infected my daughter. her Boyfriend) had resolved and UNDERDOSE (Got half dose for the booster) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, SARS-CoV-1 test: Negative and Positive.     For SPIKEVAX NOS (SPIKEVAX NOS) (Unknown), the reporter did not provide any causality assessments.   No concomitant medication was reported.  In Dec 2022, he actually got infected and ended up infecting the rest of his family. He was the index case. He work in hospitals, travel for work. He had not been infected throughout the pandemic. He had the Pfizer boost around October or November.   This case was linked to US-MODERNATX, INC.-MOD-2023-745750, US-MODERNATX, INC.-MOD-2023-745749, US-MODERNATX, INC.-MOD-2023-745754, US-MODERNATX, INC.-MOD-2023-745840 (E2B Linked Report).   Most recent FOLLOW-UP information incorporated above includes: On 16-Oct-2023: Live follow-up received that contains significant information: Reporter, Patient details and reference Ids updated.; Sender's Comments:  US-MODERNATX, INC.-MOD-2023-745750:Daughter's boyfriend case US-MODERNATX, INC.-MOD-2023-745749:Daughter case US-MODERNATX, INC.-MOD-2023-745754:Wife case US-MODERNATX, INC.-MOD-2023-745840:Son case