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Staphylococcus aureus is an important pathogen of humans and other animals, causing bacteremia, abscessation, toxemia, and other infectious diseases. An animal model using CD-1 mice was developed to study the pathogenesis of methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA). When inoculated into the CD-1 mouse model, it was shown that both MSSA isolates, (HR 78 and CSA-1) and MRSA isolates (MRSA 456 and MRSA 457) led to chronic infection of the kidney. Female CD-1 mice inoculated with MRSA 456 proved to be more susceptible to infection and mortality than their male counterparts. Castrated mice became more susceptible to infection than intact male mice, suggesting a hormonal involvement in the infection process.Key words: Staphylococcus aureus, animal model, gender, MSSA, MRSA.

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OBJECTIVES: To determine how department chairs in pediatrics rate involvement in medical research and to determine whether faculty deans' offices have written criteria for evaluating research activity when assessing candidates for promotion or tenure. DESIGN: Cross-sectional mailed survey and telephone survey. SETTING: Canadian faculties of medicine. PARTICIPANTS: Chairs of the 16 Canadian university departments of pediatrics and deans' offices of the 16 university medical faculties. MAIN OUTCOME MEASURE: Weight assigned by department chairs to contributions to published research according to author's research role and position in list of authors and the method of listing authors. RESULTS: Fifteen of 16 chairs responded. Twelve submitted a completed survey, two described their institutions' policies and one responded that the institution had no policy. Eleven reported that faculty members were permitted or requested to indicate research roles on curricula vitae. There was a consensus that all or principal investigators should be listed as authors and that citing the research group as collective author was insufficient. The contribution of first authors was rated highest for articles in which all or principal investigators were listed. The contribution of joint-principal investigators listed as first author was also given a high rating. In the case of collective authorship, the greatest contribution was credited to the principal investigator of the group. Participation of primary investigators in multicentre research was rated as having higher value than participation in single-centre research by seven respondents and as having equal value by four. Only one dean's office had explicit written criteria for evaluating authorship. CONCLUSIONS: Most departments of pediatrics and medical faculty dean's offices in Canadian universities have no criteria for assessing the type of contribution made to published research. In view of the trend to use multicentre settings for clinical trials, guidelines for weighting investigators' contributions are needed.

OBJECTIVE: To update the 1984 recommendations of the Canadian Task Force on the Periodic Health Examination on the routine screening of asymptomatic patients for infection with Chlamydia trachomatis. OPTIONS: Screening, with the use of culture or nonculture tests, of the general population, of certain high-risk groups or of all pregnant women; or no routine screening. OUTCOMES: Rates of asymptomatic and symptomatic chlamydial infection, perinatal complications, longterm complications of infection (i.e., pelvic inflammatory disease, infertility and ectopic pregnancy), coinfection with other sexually transmitted diseases, disease spread, hospital care, complications of therapy and costs of infection and of screening. EVIDENCE: Search of MEDLINE for articles published between Jan. 1, 1983, and Dec. 31, 1995, with the use of the major MeSH heading "chlamydial infections," references from recent review articles and recommendation by other organizations. VALUES: The evidence-based methods of the Canadian Task Force on the Periodic Health Examination were used. Advice from reviewers and experts and recommendations of other organizations were taken into consideration. Prevention of symptomatic disease and decreased overall costs were given high values. BENEFITS, HARMS AND COSTS: The greatest potential benefits of screening asymptomatic patients for chlamydial infections are the prevention of complications, especially infertility and perinatal complications, and the prevention of disease spread. There is no evidence that screening of the general population for chlamydial infections leads to a reduction in complications, and screening may increase costs. However, there is evidence that annual screening of selected high-risk groups and of pregnant women during the first trimester is beneficial in preventing symptoms and reducing the overall cost resulting from infection. RECOMMENDATIONS: There is fair evidence to support screening and treatment of pregnant women during the first trimester (grade B recommendation) as well as annual screening and treatment of high-risk groups (sexually active women less than 25 years of age, men or women with new or multiple sexual partners during the preceding year, women who use nonbarrier contraceptive methods and women who have symptoms of chlamydial infection: cervical friability, mucopurulent cervical discharge or intermenstrual bleeding; grade B recommendation). There is fair evidence to exclude routine screening of the general population (grade D recommendation). VALIDATION: These recommendations are similar to those of the US Preventive Services Task Force and the US Centers for Disease Control and Prevention, Atlanta. SPONSOR: These guidelines were developed and endorsed by the Canadian Task Force on the Periodic Health Examination, which is funded by Health Canada and the National Health Canada and the National Health Research and Development Program. The principal author (H.D.D.) was supported in part by the Ontario Ministry of Health and the Canadian Infectious Diseases Society Lilly Fellowship.