Yks kommentti katosi bittiavaruuteen kun yritin muokata, mutta ei se mitään, jatketaan tällä. Tässä ruotsalaisten katsauksessa kerrotaan, että tbe-viruksen esiintymiseen vaikuttavat koko lailla samat tekijät kuin borrelioosinkin esiintymiseen. Tbe:tä esiintyy kuitenkin selvästi enemmän laikuttain, ei tasaisesti, ja mukana ilmiössä ovat sää ja ilmasto. Vaikuttavat eläinlajit ovat hirvieläimet, jäniseläimet, hiiret, myyrät sekä linnut.

”Based on a review of published data we presume that certain temperature-related variables and the population densities of transmission hosts, i.e. small mammals, and of primary tick maintenance hosts, i.e. cervids and lagomorphs, of the TBE virus vector Ixodes ricinus, are among the potentially most important factors affecting the TBE incidence.

The epidemiology of TBE varies with time and geography and depends on numerous factors, i.a. climate, virus genotypes, and densities of vectors, tick maintenance hosts and transmission hosts. This study suggests that the increased availability of deer to I. ricinus over large areas of potential tick habitats in southern Sweden increased the density and range of I. ricinus and created new TBEV foci, which resulted in increased incidence of human TBE. New foci may be established by TBE virus-infected birds, or by birds or migrating mammals infested with TBEV-infected ticks. Generally, persistence of TBE virus foci appears to require presence of transmission-competent small mammals, especially mice (Apodemus spp.) or bank voles (Myodes glareolus>).”

Jaenson ym. 2018. The importance of wildlife in the ecology and epidemiology of the TBE virus in Sweden: incidence of human TBE correlates with abundance of deer and hares. Parasites & Vectors 11. Article number 477.