A study suggests the ancestral fondness for inter-species sex could be blamed for a weaken immune system among Europeans. Scientists found the immune system of African descent responds strongly to infection than those with European descent, this is in part due to the Neanderthal genes.
While it is accepted people of difference ancestry have different levels of pathogens resistance. The scientists found people originating from Africa killed bacteria three times faster. It is said when humans migrated from Africa to Europe the continent was already populated by Neanderthals. Genetic evidence shows the two populations co-existed and sometimes, they interbred. Meaning modern Europeans have a small percentage of Neanderthal DNA.
The team of Canadian, French and US scientists shows the DNA gives Europeans a lower immune system. One theory suggests there are fewer pathogens in areas with a closer climate. This means the body fight bacteria and viruses less.
