Ключевые слова: action, africa, aim, business, change, concept, corona, coronavirus, covid, danger, delta, development, direction, disease, epidemic, flu, forward, future, goal, guide, health, health care, infection, information, inscription, letter, medical, medicine, message, mutation, new, next, outbreak, pandemic, plan, progress, question, sign, strain, strategy, success, target, text, virus, vision, way, what, who, word,