Caucasian man, patient with blue stamp vaccinated on hand. Concept of people vaccination for covid-19 coronavirus, flu, infectious diseases.Injection mark.Clinical trials for human,child,adult,senior. coronavirus, vaccine, stamp, vaccinated, covid-19, hand, doctor, injection, vaccination, corona, virus, clinical, trials, immunization, flu, medicine, nurse, scientist, pandemic, human, science, infection, usa, uk, russia, germany, israel, syringe, compulsory, immunity, needle, hands,country,population, mass