Often Attacked Disease, People Can be Invulnerability

London, City life is identical to many diseases caused. But scientists found people who live in urban areas urban alias, are genetically better at fighting infection than rural people.

The team of scientists from the University of London studying how people carry the gene variant that can be resistant to various germ diseases, such as tuberculosis (TB), malaria and leprosy.

The condition is more common in urban areas or urban areas, where various kinds of diseases have been rampant.

When the residents affected by outbreaks of the deadly disease, people who can survive will pass its genes to the next generation.This is what will make the next generation is more resistant to fight infection.

Life in the city that often cause many diseases was found to increase the resistance (immunity) of the body against various diseases.

"People are more resistant to a pathogen of the disease with greater mortality such as malaria or tuberculosis, will survive better and will contribute more in the offspring of the next generation," said Professor Brian Spratt, a molecular microbiologist at Imperial College London School of Public Health, as quoted by BBC News, Wednesday (29/09/2010).

So, for centuries, the greater the level of exposure to disease history, the more likely that the resistance gene would spread widely among the population, especially in dense urban areas with population.

Scientists from University College London and Royal Holloway, part of the University of London, tested this by analyzing the DNA samples taken from 17 human populations that live in Europe, Asia and Africa.

Protective gene variant were found in nearly all people from the Middle East to India and in parts of Europe, which is the city that has stood for thousands of years. But the gene is rarely found in areas with a shorter history of urbanization, such as Africa.

"This is a very new aspect of the evolution of species, namely the development of the city as a selective force," explained Dr Ian Barnes, one of the authors of the study.

According to Dr Barners, the findings have been reported in the journal Evolution can also help explain some differences about the resilience of disease that occurs worldwide.