Читать книгу Principles of Virology, Volume 2 - Jane Flint, S. Jane Flint - Страница 46

One often hears that a virus is “going around,” and such comments usually correlate with particular times of year (flu season). The seasonal appearance of some viruses, especially those that cause respiratory and gastrointestinal disease, raises the question of what parameters facilitate seasonal or temporal spread in a population. This question is relevant both to viruses that cause widespread epidemics and to more mundane infections, such as the common cold. Identifying the variables associated with increased risk in a population has obvious value in clinical and educational efforts to prevent or limit outbreaks. As discussed below, multiple aspects of both the host and the environment contribute to maintaining a virus in a community.