Inclusion Criteria:  Male or female ≥ 18 years of age at the time of baseline blood draw, up to 65 years old Community member who observe Ramadan during April 12 (Monday evening) through May 11, 2021 (Tuesday sundown) Understand and sign the informed consent form and have ability to comply with the requiremnets of the study Vaccinated for COVID or having a history of a positive PCR test which was resolved  Exclusion Criteria:  Anticubital vein is not accessible Pregnant, breastfeeding, recovering from major illness or surgery that influences quality of life Who reside more than 14 miles away from the city limits Unavailable to meet in-person and donate blood for any of three measurement days (basline, 15th day, post Ramadan) Smoking, drinking aclohol or using recreational drug Presence of a condition that in the opinon of the Investigator would compromise the safety of the participant or the quality of the data