High prevalence of Neisseria gonorrhoeae in a remote, undertreated population of Namibian pastoralists.

The highly remote pastoralist communities in Kaokoland, Namibia, have long been presumed to have high gonorrhoea prevalence. To estimate gonorrhoea prevalence and correlates of infection, we conducted a cross-sectional study of 446 adults across 28 rural villages. Gonorrhoea status was determined from urethral and vaginal swabs via qPCR assay. All participants answered a closed-ended interview about demographics, sexual behaviour and symptom history. Sixteen per cent of participants had high-level infections (⩾ID(50) dose) and 48% had low-level infections (

Isolation of the first three cases of Clostridium difficile polymerase chain reaction ribotype 027 in Singapore.

INTRODUCTION: The incidence of Clostridium (C.) difficile infection (CDI) was on the rise from 2001 to 2006 in Singapore. Recent unpublished data suggests that its incidence had remained stable or decreased in most local public hospitals between 2006 and 2010. It is, however, not known if the polymerase chain reaction (PCR) ribotype 027 strains have been circulating, although reports suggest that this strain is emerging in Asia, with the first cases reported from Japan in 2007, as well as in Hong Kong and Australia in 2009. We initiated a culture-based surveillance to detect this epidemic strain in Singapore. METHODS: From September 2008 to December 2009, all non-duplicate toxin-positive stool samples from the three largest public hospitals in Singapore were collected for culture and further analysis. RESULTS: Out of the 366 samples collected, 272 viable isolates were cultured. Of these, 240 tested toxin-positive and ten tested positive for the binary toxin gene; 35 different PCR ribotypes were found. Three isolates that tested positive for binary toxin contained the same PCR ribotyping pattern as the C. difficile 027 control strain. All three had the 18-bp deletion and single nucleotide tcdC deletion at position 117. Susceptibility testing was performed, demonstrating susceptibility to erythromycin and moxifloxacin. CONCLUSION: We report the first three isolates of C. difficile 027 from Singapore. However, their susceptibility patterns are more consistent with the historical 027 strains. Rising CDI incidence may not be associated with the emergence of the epidemic 027 strain at this time.

The role of future unpredictability in human risk-taking.

Models of risk-taking as used in the social sciences may be improved by including concepts from life history theory, particularly environmental unpredictability and life expectancy. Community college students completed self-report questionnaires measuring these constructs along with several well-known correlates. The frequency of risk-taking was higher for those with higher future unpredictability beliefs and shorter lifespan estimates (as measured by the Future Lifespan Assessment developed for this study), and unpredictability beliefs remained significant after accounting for standard predictors, such as sex and temperament. The results demonstrate the usefulness of applying concepts from life history theory to enhance our understanding of human behavior.

Behavioral ecology of conservation in traditional societies.

A common exhortation by conservationists suggests that we can solve ecological problems by returning to the attitudes of traditional societies: reverence for resources, and willingness to assume short-term individual costs for long-term, group-beneficial sustainable management. This paper uses the 186-society Standard Cross-Cultural Sample to examine resource attitudes and practices. Two main findings emerge: (1) resource practices are ecologically driven and do not appear to correlate with attitude (including sacred prohibition) and (2) the low ecological impact of many traditional societies results not from conscious conservation efforts, but from various combinations of low population density, inefficient extraction technology, and lack of profitable markets for extracted resources.

Men in the demographic transition.

Women's fertility is the focus of most demographic analyses, for in most mammals, and in many preindustrial societies, variance in male fertility, while an interesting biological phenomenon, is irrelevant. Yet in monogamous societies, the reproductive ecology of men, as well as that of women, is important is creating reproductive patterns. In nineteenth-century Sweden, the focus of this study, male reproductive ecology responded to resource conditions: richer men had more children than poorer men. Men's fertility also interacted with local and historical factors in complex ways to have significant impact on population growth. As a result, "the" demographic transition was local, and locally reversible, in Sweden. Results cannot be simply translated from nineteenth-century studies to current attempts to promote fertility decline, because today, male and female resource-fertility curves differ in shape, not only in magnitude. When we translate studies of fertility decline, it is important to study individual fertility and to discern whether, in any particular case, male and female patterns are similar.

Ecological demography: a synthetic focus in evolutionary anthropology.

"Ecological demography arises from two facts: that the reproductive behavior of humans, like that of other species, is influenced by natural selection and that current fitness is the product of both genotype and environment. Here I review classic atheoretical and recent theoretical studies that contribute to this emerging field, exploring the extent to which human reproductive responses to ecological conditions, considered in their broadest context, follow the same selective rules as other species."

Cross-cultural patterns in the training of children: an evolutionary perspective.

Analyzed cross-cultural child inculcation data from Barry, Josephson, Lauer, & Marshall (1976) by testing a hypothesis derived from natural selection theory: The ways in which boys are trained (vs. those for girls) should correlate with male and female reproductive strategies prevalent in each society. Boys are trained to be more aggressive, show more fortitude, and be more self-reliant than girls; girls are trained to be more industrious, responsible, obedient, and sexually restrained than boys. The more polygynous the society (the higher the potential reproductive rewards for males), the more sons in nonstratified societies were taught to strive. Stratified societies, which restrict men's reproductive striving, showed very different patterns. The more actual control women in any society had over resources, the less daughters were taught to be obedient.