“…They were two studies from the United States, 33 , 38 one study from Bangladesh, 63 one study from Jordan, 64 one study from Italy, 66 and one study from Ethiopia. 67 Generally, the present systematic review has briefly summarized factors associated with the willingness of receiving COVID-19 vaccine. They were; age, educational status, gender, income, residency, occupation, marital status, race/ethnicity, perceived risk of COVID-19, trust in healthcare system, health insurance, norms, attitude towards a vaccine, perceived benefit of vaccine, perceived vaccine barriers, self-efficacy, up-to-date on vaccinations, tested for COVID-19 in the past, responsibility, perceived efficacy of the COVID-19 vaccination, use of social media for COVID-19 vaccine-related information, recommended for vaccination, political leaning, perceived severity of COVID-19, perceived effectiveness of a COVID-19 vaccine, belief that vaccination makes them feel less worried about COVID-19, believing in mandatory COVID-19 vaccination, perceived potential vaccine harms, presence of chronic disease, previously received an influenza vaccine, confidence, having COVID-19 vaccine safety concern, working in the healthcare field, believing vaccines can stop the pandemic, relying on Centers for Disease Control and Prevention website for COVID-19 updates, fear about COVID-19, being HCWs, close attention to the latest news of the vaccine, cues to action, COVID-19 vaccine hesitancy, receiving any vaccine in the past 5 years, perception of disease can be prevented by vaccine, willingness to protect others by getting oneself vaccinated, taking direct care of COVID-19 patients, belief that only people who are at risk of serious illness should be vaccinated, trust in government, complacency, willingness to pay for and travel for a vaccine, themselves or a member of their household belonged to a vulnerable group, trust in public health authorities, believing COVID-19 virus was not developed in laboratories, believing COVID-19 is far more contagious and lethal relative to the H1N1 virus, compliance with community mitigation strategies, being in a private sector, encountering with suspected or confirmed COVID-19 patients, self-reported health outcomes, believing that next waves COVID-19 are coming, knowledge score regarding symptoms, transmission routes and prevention and control measures against COVID-19, and perception that COVID-19 will persist ( Table 1 ).…”