Ключевые слова: black background, black buck, causative agents, cluster, collective, communication, congestion, contact, copy space, crowd, crowded, doll, epidemic, flock, flu, gets crowded, human, human model, hustle and bustle, image, infected persons, infection, many people, miniature, model, more than one, outbreaks, pass each other, passing, people, people come and go, prevention, virus,