The medical records of 53 patients who had reactivation of tuberculosis between 1970 and 1973 in Oklahoma were reviewed. Reactivation accounted for 4 percent of all cases reported in this period. No correlation was found between race or sex and risk of reactivation. The interval between original diagnosis and reactivation (median 14.0 years) was longer than has been reported in other series but...

for working men and women; by authorizing enforcement of the standards developed under the Act; by assisting and encouraging the States in their efforts to assure safe and healthful working conditions; by providing for research, information, education, and training in the field of occupational safety and health; and for other purposes.

This study examines issues related to the fertility of graduate students over time. First, it examines changes in motherhood rates between 1970 and 2000 among women aged 20–49 who are enrolled in graduate school, both by themselves and relative to prevailing trends among women not enrolled in graduate school, and to other college educated women. Overall, women enrolled in graduate school are in...

Since the first clear demonstration of the existence of 'specific' antigens in experimental tumours (Gross, 1943; Foley, 1953), the extensive use of syngeneic animals has resulted in the identification of tumour-associated or characteristic macromolecules ('antigens') in association with spontaneously occurring or experimentally induced tumours (Old and Boyse, 1964; Baldwin, 1970; Stonehill and...