Nine hundred thirty-three persons over 65 years of age, residing in long-term or extended-care facilities in Vancouver, Canada, had tuberculin tests. In addition to PPD-tuberculin, 5 TU and 250 TU, we used PPD-Battey, Candida albicans, mumps, and Trichophyton antigens. Twenty-five percent reacted to 5 TU of tuberculin with reactions of 10 mm or more. There was a progressive, substantial loss of...

We have previously reported the results of ten years of systematic tuberculin Qsting of kindergarten and first grade children in Kansas City, Missouri. This report adds seven yeas of testing in different age groups (8th and 9th; and 4th and 5th grades). As reported in the previous study, the prevalence rates and conversion rates to tuberculin are markedly different depending on the frequency at...

Tuberculosis is a serious disease of humans and animals, caused by bacteria of the Mycobacterium genus. This leads to complications in the life of the sick person, and subsequently to death. The cattle, who have been diagnosed with this bacterium, are usually sent to the slaughter, with the result that their livestock is reduced. Mycobacteriosis is also a disease, after determining which cattle...

Comprehensive new guidelines for screening, targeted testing, and treating latent tuberculosis infection (LTBI) in children and adolescents are presented. The recent epidemiology of TB and data on risk factors for LTBI are reviewed. The evidence-based recommendations provided emphasize the paradigm that children and adolescents should be screened for risk factors by using a risk-factor question...

BACKGROUND The annual risk of Tuberculosis infection (ARTI) is a key indicator in epidemiology, of the extent of transmission in a community. There have been several suggested methods in order to evaluate the prevalence of Tuberculosis infection using tuberculin skin data. This survey estimates the ARTI in young Hellenic air force recruits. The effect of BCG vaccination has also been investigat...

It is generally accepted that once an individual manifests an allergic state by responding locally to the intracutaneous administration of tuberculin (O. T.) this response may be elicited indefinitely. A positive tuberculin reaction, moreover, has been interpreted universally as indicating the presence of infection with the tubercle bacillus, if not actually infectious disease capable of clinic...