Didn't get the second dose.; vomiting, recurring approximately every 2 weeks for about 24 hours each time; chills that wont go away; worst flu ever; cold sweats, recurring approximately every 2 weeks for about 24 hours each time; twinges in abdomen; painful excruciating gut pain, recurring approximately every 2 weeks for about 24 hours each time; This spontaneous case was reported by a consumer and describes the occurrence of INFLUENZA (worst flu ever), COLD SWEAT (cold sweats, recurring approximately every 2 weeks for about 24 hours each time), ABDOMINAL PAIN (twinges in abdomen), GASTROINTESTINAL PAIN (painful excruciating gut pain, recurring approximately every 2 weeks for about 24 hours each time) and PRODUCT DOSE OMISSION ISSUE (Didn't get the second dose.) in a 66-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 029A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included Cancer (former cancer patient; 5 different cancers in the past 30 years). Previously administered products included for an unreported indication: Flu vaccine (experienced very similar symptoms after receiving the flu vaccine) in November 2020. Past adverse reactions to the above products included Adverse event following immunisation with Flu vaccine. Concomitant products included PEMBROLIZUMAB (KEYTRUDA) for an unknown indication.    On 05-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 05-Mar-2021, the patient experienced INFLUENZA (worst flu ever), COLD SWEAT (cold sweats, recurring approximately every 2 weeks for about 24 hours each time), ABDOMINAL PAIN (twinges in abdomen), GASTROINTESTINAL PAIN (painful excruciating gut pain, recurring approximately every 2 weeks for about 24 hours each time), VOMITING (vomiting, recurring approximately every 2 weeks for about 24 hours each time) and CHILLS (chills that wont go away). On an unknown date, the patient experienced PRODUCT DOSE OMISSION ISSUE (Didn't get the second dose.). The patient was treated with PARACETAMOL (TYLENOL) for Adverse event, at an unspecified dose and frequency and HYDROCODONE BITARTRATE, PARACETAMOL (NORCO) for Adverse event, at an unspecified dose and frequency. On 07-Mar-2021, INFLUENZA (worst flu ever) had resolved. At the time of the report, COLD SWEAT (cold sweats, recurring approximately every 2 weeks for about 24 hours each time), GASTROINTESTINAL PAIN (painful excruciating gut pain, recurring approximately every 2 weeks for about 24 hours each time) and VOMITING (vomiting, recurring approximately every 2 weeks for about 24 hours each time) had not resolved and ABDOMINAL PAIN (twinges in abdomen), PRODUCT DOSE OMISSION ISSUE (Didn't get the second dose.) and CHILLS (chills that wont go away) outcome was unknown.        The action taken with mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) was unknown.       The patient did not receive the second dose of the vaccine, though his primary doctor recommended he get it. He stopped taking pembrolizumab (KEYTRUDA) 6-7 weeks ago.   Most recent FOLLOW-UP information incorporated above includes: On 27-Jul-2021: Event outcomes updated. Treatment medication added. Relevant history added.