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Results for “TICK FEVERS”

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At least 253 records · Page 14Linked to original sources
PubMed1979

Discriminant analysis: a method of identifying foci of vector-borne diseases.

Identification of foci of vector-borne diseases does not require knowledge of exact abundances of vectors and pathogens; rather, a focus is defined by the presence, or some minimal level of abundance, of a vector and pathogen. Stepwise discriminant analysis (DA) was applied to data on free-ranging adult wood ticks (the vector) and to data on isolations of Colorado tick fever virus from small mammals. Trap stations were grouped on the basis of relative abundance of wood ticks for one set of analyses and on the presence or absence of virus for another set of analyses. Additional data consisted of easily measured environmental variables. It is concluded that DA provides a useful tool for analysis of ecosystem structure and an effective means of identifying foci of infection.

Animals↗
PubMed1973

Induction of interferon in L cells by reoviruses.

L cell cultures challenged with reoviruses types 1 and 3 produced little to no detectable interferon under conditions which permitted virus replication and under conditions which prevented replication of a temperature-sensitive mutant strain of reovirus type 3 (ts-1). Ultraviolet-irradiated reoviruses and double-stranded ribonucleic acids extracted from purified reovirus type 3 also induced little to no interferon in L cell cultures. Under similar conditions, MM virus proved to be an effective inducer of interferon. Exposure of L cells to interferon prior to challenge with virus (priming) failed to enhance interferon production upon subsequent challenge with reovirus although priming increased the amount of interferon produced following MM virus challenge. L cell cultures that were challenged with reovirus type 3 and subsequently with either MM or Colorado tick fever viruses produced similar titers of interferon as cell cultures that were challenged with either MM or Colorado tick fever virus alone, respectively. These data show that the presence of production of reovirus type 3 double-stranded ribonucleic acid is not sufficient for induction of interferon in L cell cultures and that additional processes which are required for induction of interferon in L cell cultures are not expressed by reovirus type 3.

Interferons↗