Global shifts in mammalian population trends reveal key predictors of virus spillover risk

Emerging infectious diseases in humans are frequently caused by pathogens originating from animal hosts, and zoonotic disease outbreaks present a major challenge to global health. To investigate drivers of virus spillover, we evaluated the number of viruses mammalian species have shared with humans. We discovered that the number of zoonotic viruses detected in mammalian species scales positively with global species abundance, suggesting that virus transmission risk has been highest from animal species that have increased in abundance and even expanded their range by adapting to human-dominated landscapes. Domesticated species, primates and bats were identified as having more zoonotic viruses than other species. Among threatened wildlife species, those with population reductions owing to exploitation and loss of habitat shared more viruses with humans. Exploitation of wildlife through hunting and trade facilitates close contact between wildlife and humans, and our findings provide further evidence that exploitation, as well as anthropogenic activities that have caused losses in wildlife habitat quality, have increased opportunities for animal–human interactions and facilitated zoonotic disease transmission. Our study provides new evidence for assessing spillover risk from mammalian species and highlights convergent processes whereby the causes of wildlife population declines have facilitated the transmission of animal viruses to humans.

Hepatic venous outflow obstruction in pediatric liver transplantation: technical considerations in prevention, diagnosis, and management

HVOO creates significant diagnostic and management dilemmas in pediatric liver transplant recipients, particularly with TVGs (split or reduced-size grafts). Numerous technical variations for the hepatic vein to IVC anastomosis have been described to minimize the incidence of this complication, but no consensus for an optimal anastomotic technique exists. One hundred and thirty-four liver transplants (70 TVGs) were performed in 124 patients between 1994 and 2011. These were divided into two cohorts. Group 1 (95 transplants, 41 TVGs) utilized a continuous running anastomosis. Group 2 (39 transplants, 29 TVGs) implemented a triangulated (three-stitch) anastomosis. All were reviewed for demographics, diagnostics, interventions, and outcome. The overall HVOO incidence was seven of 134 transplants (5.2%) and six of 70 transplants utilizing TVGs (8.6%). Group 1 incidence was five of 41 (12.2%) compared with one of 29 (3.4%; p = 0.20, OR 3.89) in Group 2. Liver Doppler was employed in all patients, and only three suggested HVOO. All patients with HVOO underwent venogram, at a median of 81 days post-transplant. All underwent percutaneous venoplasty and required 1-6 treatments, all resulting in HVOO resolution. Incidence of HVOO has improved since adopting the triangulated anastomosis, although not to a level of statistical significance. US is not adequately sensitive to exclude HVOO. Venogram is recommended in patients with prolonged ascites, and venoplasty has been highly successful in HVOO treatment.

Psychosocial and behavioral factors in early adolescence as predictors of heavy drinking among high school seniors

OBJECTIVE

Most adolescents experiment with alcohol, and the use of alcohol typically escalates during the teenage years. The present study examined how several risk and protective factors measured during early adolescence were associated with heavy drinking in a sample of high school seniors.

METHOD

As part of a school-based survey, seventh-grade students (N = 1,132) reported degrees of experimentation with alcohol and cigarettes. Several psychosocial factors deemed to be important in the etiology of drinking were also assessed. Students were followed-up in the twelfth grade, when 16% were categorized as heavy drinkers based on drinking and drunkenness frequency and quantity typically consumed.

RESULTS

Logistic regression analyses revealed that heavy drinking was predicted by having had experimented with alcohol or cigarettes, having had a majority of one's friends drink and having had poor behavioral self-control in early adolescence. In addition, several effects were limited to either boys or girls. For example, positive alcohol expectancies predicted greater later heavy drinking in boys, while friends' smoking predicted later heavy drinking in girls.

CONCLUSIONS

The findings suggest that early intervention programs aimed at preventing alcohol use by addressing the social and psychological determinants of alcohol use may have important preventive effects in terms of later heavy drinking.

A six-year follow-up study of determinants of heavy cigarette smoking among high-school seniors

Most adult cigarette smokers start smoking during adolescence. Few studies, however, have focused on adolescents that are heavy smokers. The present study examined how several risk and protective factors measured during early adolescence were associated with heavy smoking in a sample of high-school seniors. As part of a school-based survey, seventh-grade students (N = 743) reported degrees of experimentation with psychoactive substances and several psychosocial factors deemed to be important in the etiology of smoking. Students were followed-up in the twelfth grade, when 12% (n = 88) smoked a pack of cigarettes or more each day. Logistic regression analyses revealed that heavy smoking was predicted by several earlier variables: poor grades, experimentation with cigarettes or alcohol, a mother or many friends that smoked, and high risk-taking in the seventh grade. Antismoking attitudes and those of one's parents and friends predicted less later heavy smoking in girls only. Implications for smoking prevention are discussed.

The Stereochemistry of Organometallic Compounds. XXXIV. Regioselection in the Hydroformylation of Silylalkenes

The regiochemistry of hydroformylation of alkenes can be controlled by the use of bulky silyl groups attached to the alkene. Use of the t-butyldiphenylsilyl group leads to almost total regiocontrol and the method has been applied to the synthesis of aldols.