Ключевые слова: 19, application, apps, background, business, code, coding, company, concept, coronavirus, covid, covid19, diagnostic, digital, epidemic, health care, identification, identity, illness, infected, infection, information, message, mobile, online, patient, phone, qr, qr code, quarantine, quick, risk, scan, screen, sign, simplicity, smart phone, spread, stethoscope, stop, symbol, technology, virus, warning, work, worker, yellow,