Approaches to Assessing Host Resistance

Approaches to assessing host resistance.

There is increasing evidence that chronic, subclinical exposure to certain environmental pollutants may upset immune responsiveness and alter susceptibility of animals to infectious agents. Environmental chemicals or drugs may affect diverse aspects of the immune system, leading to immunosuppression, immunopotentiation, hypersensitivity or perturbed innate host resistance. A variety of infectio...

Host resistance to ectoparasites.

Examples of immunological reactions to arthropod parasites include responses by hosts to the following stimuli: excretory and secretory antigens produced by myiasis-producing larvae or skin-dwelling (mange) mites salivary antigens of blood-sucking arthropods. In many cases, these are hypersensitivity reactions, which often appear not to produce very deleterious effects on the parasites. However...

New ApproAches to resistANce

Cryptosporidium and host resistance: historical perspective and some novel approaches.

Cryptosporidium parvum is recognized as a major cause of diarrheal disease in neonatal bovine calves. In addition, this protozoan parasite has emerged as an important cause of disease in both immunocompromised and immunocompetent humans. Despite years of research, no consistently effective means of prevention or treatment are readily available for cryptosporidiosis in any species. Infection thr...

Statistical Approaches to Assessing Pesticideconcentrationsinthedpr Surfacewaterdatabase

Various studies on measured levels of pesticides in water have been completed and data from these studies are currently available on a surface water database maintained by the Department of Pesticide Regulation (DPR). W e examine portions of two databases in this report and suggest statistical methodology for approaching questions of importance in monitoring pesticide levels in water. The quest...