Diseases, Conditions, Syndromes

Reducing delays in identifying visceral leishmaniasis

Women in Indian states with endemic visceral leishmaniasis—also known as Kala Azar—should be encouraged to seek care for persistent fever without delay. Raised awareness about the disease and its symptoms, and the prioritization ...

Health

Nigeria isn't doing enough to reduce tobacco use. Here's why

Tobacco remains the biggest public health threat, killing more than seven million people globally every year. The World Health Organisation (WHO) has recognised progress in Nigeria, but concerns remain about effective implementation.

Diseases, Conditions, Syndromes

Using satellite images to better target vaccination

Satellite images that capture short-term changes in population size in communities in the developing world can help vaccination campaigns achieve more complete coverage to help prevent and control disease outbreaks. A team ...

Diseases, Conditions, Syndromes

New analysis explores the geographical origins of the flu

A computer model developed by scientists at the University of Chicago shows that small increases in transmission rates of the seasonal influenza A virus (H3N2) can lead to rapid evolution of new strains that spread globally ...

Health

The plus side of population aging

Around the world, people are living longer and having fewer children, leading to a population that is older, on average, than in the past. On average, life expectancy in developed countries has risen at a pace of three months ...

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Population size

In population genetics and population ecology, population size (usually denoted N) is the number of individual organisms in a population.

The effective population size (Ne) is defined as "the number of breeding individuals in an idealized population that would show the same amount of dispersion of allele frequencies under random genetic drift or the same amount of inbreeding as the population under consideration." Ne is usually less than N (the absolute population size) and this has important applications in conservation genetics.

Small population size results in increased genetic drift. Population bottlenecks are when population size reduces for a short period of time.

Overpopulation may indicate any case in which the population of any species of animal may exceed the carrying capacity of its ecological niche.

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