Biomedical subjects

J Nosek

Publications and source records attributed to J Nosek.

136 records · Page 8Linked to original sources

PubMed1967

The ecology of ticks in the Tribec and Hronský Inovec Mountains.

Ecological studies on ticks are an essential part of epidemiological investigations on arbovirus infections. The paper deals with the distribution, bionomy, trophic relationships and rearing of ticks in the laboratory and refers to the role of Ixodes ricinus ticks as vectors of the tick-borne encephalitis virus. The ticks that are common to the region are I. ricinus, I. hexagonus, I. trianguliceps, Haemaphysalis concinna, H. punctata, H. inermis and Dermacentor marginatus. I. ricinus, which is very widely distributed, is the principal vector of tick-borne encephalitis. The hosts, both mammals and birds, of the different stages (larvae, nymphs and adults) of the ticks are listed.

Animals↗

PubMed1967

The role of small rodents and hedgehogs in a natural focus of tick-borne encephalitis.

The role of small rodents and hedgehogs in the circulation of tick-borne encephalitis in natural foci in the Tribec region of Czechoslovakia has been studied. Isolation of virus from the blood of Apodemus flavicollis, Clethrionomys glareolus and Erinaceus roumanicus, as well as the demonstration of antibodies in the sera of these mammals and of A. sylvaticus, Microtus arvalis and Sciurus vulgaris, showed that these mammals had been in contact with the virus in recent years. The proportion of positive sera was low, ranging from 4% to 11% for A. flavicollis in various parts of the Tribec region. In a study of the elementary focus at Jarok, it was found that the frequency of antibodies was considerably higher in hedgehogs than in small rodents; this may be due to the longer life-cycle of the former, which makes the probability of reinfection greater. Clearly, the hedgehog and the small rodents studied are important hosts of ticks and reservoirs of tick-borne encephalitis virus in the Tribec region.

Animals↗

PubMed1967

Isolation of tick-borne encephalitis virus from Ixodes ricinus ticks in the Tribec region.

An attempt has been made to isolate the tick-borne encephalitis virus from nymphs and adults of the tick Ixodes ricinus in the Tribec region. In 1963 no virus was found in 2715 nymphs and 998 adults from various parts of the region, but in 1964, from 2153 unfed ticks collected in the spring, two strains of virus were isolated from the 798 nymphs and two from the adults (one from 647 males and one from 708 females). Thus, on average, 0.2% of the ticks in the region were infected; in the elementary foci of Topol'cianky and Jelenec, where the virus-containing ticks were found, the proportion varied between 0.4% and 0.8%. In 1964 no viruses having a cytopathic effect on chick-embryo-cell cultures were isolated from I. ricinus ticks, in contrast to the isolation of nine such strains in the previous year. The significance of these results in relation to the interstadial transmission of tick-borne encephalitis virus is discussed.

Animals↗

PubMed1966