Occupational segregation by gender in veterinary specialties: Who we are choosing, or who is choosing us.

OBJECTIVE: Gender demographics vary across specialties including surgery, internal medicine, cardiology, neurology, and oncology. Our objective was to determine whether residency selection or the decision to apply for training drives these differences. STUDY DESIGN: Retrospective cohort study. SAMPLE POPULATION: Matched and unmatched residents lists from Veterinary Internship and Residency Matching Program (VIRMP) from 2011 to 2020. Comparative Data Reports from the American Association of Veterinary Medical Colleges from 2010 to 2019. METHODS: Names for matched and unmatched residents with addresses in the United States or Canada were coded for gender for seven programs: large and small animal surgery, large and small animal medicine, cardiology, neurology, and oncology. Match rate by gender was compared using chi-square tests. Gender demographics of applicants were compared to demographics of graduates using tests of two proportions. RESULTS: No differences were observed between genders for the likelihood of successfully matching into each residency program evaluated except in large animal internal medicine. Women (44.2%) were slightly more likely to match, overall, than men (39.0%, p = .003). The proportions of women applying for residencies overall (70.7%), in large and small animal surgery (66.1%, 62.2%), cardiology (70.2%), and neurology (70.7%) were lower than the proportion of female graduates (79%; p's < .001). CONCLUSION: No evidence for gender bias was detected in the VIRMP resident selection process. Female veterinary graduates seemed less likely to apply for residencies than their male counterparts. IMPACT: Occupational segregation seems to stem from the decision to apply for residency. Interventions aimed at altering gender demographics in specialized medicine should target potential applicants.

Developmental malformations resulting from high-dose maternal tamoxifen exposure in the mouse.

Tamoxifen is an estrogen receptor (ER) ligand with widespread use in clinical and basic research settings. Beyond its application in treating ER-positive cancer, tamoxifen has been co-opted into a powerful approach for temporal-specific genetic alteration. The use of tamoxifen-inducible Cre-recombinase mouse models to examine genetic, molecular, and cellular mechanisms of development and disease is now prevalent in biomedical research. Understanding off-target effects of tamoxifen will inform its use in both clinical and basic research applications. Here, we show that prenatal tamoxifen exposure can cause structural birth defects in the mouse. Administration of a single 200 mg/kg tamoxifen dose to pregnant wildtype C57BL/6J mice at gestational day 9.75 caused cleft palate and limb malformations in the fetuses, including posterior digit duplication, reduction, or fusion. These malformations were highly penetrant and consistent across independent chemical manufacturers. As opposed to 200 mg/kg, a single dose of 50 mg/kg tamoxifen at the same developmental stage did not result in overt structural malformations. Demonstrating that prenatal tamoxifen exposure at a specific time point causes dose-dependent developmental abnormalities, these findings argue for more considerate application of tamoxifen in Cre-inducible systems and further investigation of tamoxifen's mechanisms of action.

Low SARS-CoV-2 Seroprevalence and No Active Infections among Dogs and Cats in Animal Shelters with Laboratory-Confirmed COVID-19 Human Cases among Employees.

Human-to-animal and animal-to-animal transmission of SARS-CoV-2 has been documented; however, investigations into SARS-CoV-2 transmission in congregate animal settings are lacking. We investigated four animal shelters in the United States that had identified animals with exposure to shelter employees with laboratory-confirmed COVID-19. Of the 96 cats and dogs with specimens collected, only one dog had detectable SARS-CoV-2 neutralizing antibodies; no animal specimens had detectable viral RNA. These data indicate a low probability of human-to-animal transmission events in cats and dogs in shelter settings with early implementation of infection prevention interventions.

One Health Investigation of SARS-CoV-2 Infection and Seropositivity among Pets in Households with Confirmed Human COVID-19 Cases-Utah and Wisconsin, 2020.

Approximately 67% of U.S. households have pets. Limited data are available on SARS-CoV-2 in pets. We assessed SARS-CoV-2 infection in pets during a COVID-19 household transmission investigation. Pets from households with ≥1 person with laboratory-confirmed COVID-19 were eligible for inclusion from April-May 2020. We enrolled 37 dogs and 19 cats from 34 households. All oropharyngeal, nasal, and rectal swabs tested negative by rRT-PCR; one dog's fur swabs (2%) tested positive by rRT-PCR at the first sampling. Among 47 pets with serological results, eight (17%) pets (four dogs, four cats) from 6/30 (20%) households had detectable SARS-CoV-2 neutralizing antibodies. In households with a seropositive pet, the proportion of people with laboratory-confirmed COVID-19 was greater (median 79%; range: 40-100%) compared to households with no seropositive pet (median 37%; range: 13-100%) (p = 0.01). Thirty-three pets with serologic results had frequent daily contact (≥1 h) with the index patient before the person's COVID-19 diagnosis. Of these 33 pets, 14 (42%) had decreased contact with the index patient after diagnosis and none were seropositive; of the 19 (58%) pets with continued contact, four (21%) were seropositive. Seropositive pets likely acquired infection after contact with people with COVID-19. People with COVID-19 should restrict contact with pets and other animals.