Viruses are the cause of many infectious diseases. Spending their time in groups with their peers, children are more exposed to infections while their immune system is still in development and children are less resistant. The definition of an infection is the invasion of an organism’s cells or tissues by pathogens which then multiply and cause minor or serious damage. What follows after the onset of infection is a period of incubation, i.e. the time a virus needs to multiply in cells. The consequences, i.e. symptoms of a disease are most commonly visible after the period of incubation. For some diseases the incubation is short, while for the others it can last for years. Virus infections are most common in winter months when the resistance of the respiratory epithelium is weaker, children spend more time in heated places while the rooms are insufficiently ventilated. Some of the most common virus diseases among kindergarten children are: Rotavirus, chicken pox, flu, cold, acute bronchitis, virus conjunctivitis, HFMD (hand, foot, mouth disease). Virus particles can be transmitted through the air, direct physical contact (skin contact or epithelial cells) or indirect contact of a person with contaminated objects. Although antibiotics are very commonly used in treating those diseases, they do not have any effect on virus infections. With those kind of diseases, symptomatic treatment suffices. The main objective of this paper is to identify the symptoms of some virus diseases and their prevention in educational institutions. It is important to take the following preventive measures: maintain personal hygiene, regularly clean the space and equipment, disinfect the used items and surfaces, provide health education for kindergarten employees and children's parents, vaccinate children, isolate those already infected, air the rooms, spend more time outdoors, go for a walk etc. According to many studies it is established that breastfed children are less likely to suffer from respiratory and gastrointestinal diseases and infections of urinary tract and middle ear.