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Adaptive immunity, which is the more complex of the two, involves the production of antibodies which play a vital role in warding off infections. Analysis of the adult mice showed that this part of latest the immune system was weaker in males. This left them more prone to illnesses caused by bacteria, viruses and fungi. At the same time, the higher level of adaptive immunity in the females could make them more vulnerable to autoimmune conditions such as multiple sclerosis. These illnesses involve the body being attacked by latest antibodies produced by its own immune latest system. Further experiments showed that the change in the immune system at puberty is driven by the female sex hormone oestrogen. Dr Rebecca Lamason, who led the study at Johns Hopkins University in Baltimore, Maryland, said that other studies had shown that men are more likely to die from infections than women.
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