About the book: year / About 500 years ago, the Italian doctor Girolamo Fracastoro in his treatise “De contagione et contagiosis morbis et tjrum curatione" wrote about the ancestors of the young Oikovid: “ This invisible “infection” is transmitted through the contact of a sick person with a healthy person, through kissing, sneezing, coughing and simply through breathing infectious air, infectious objects... Do not be afraid of the fangs and claws of ferocious predators, do not be afraid of the formidable sword of the enemy, do not be afraid of floods, earthquakes and fires — Be afraid of the invisible “infection”»!!!