Perhaps in response, stronger immune systems evolved.
Advocates attribute stronger immune and better digestive systems to raw milk.
"Men who have higher testosterone and lower cortisol have a stronger immune response," said Puts.
Greater activation in the left prefrontal cortex was associated with a stronger immune response.
The company argues that the vaccine worked in a subset of patients with stronger immune systems, and it will present data on this in Argentina.
Although the men who were more aggressive were found to have stronger immune systems, highly aggressive men appeared to lose the benefit.
The spray gives a stronger immune reaction but carries a small risk that the virus will multiply too quickly in people with compromised immunity.
GSK hopes to induce a stronger immune response by combining RTS,S with a vaccine from Crucell, another drug firm.
They were surprised to discover, for example, that patients with inhalation anthrax, in which spores are inhaled into the lungs, produce a much stronger immune response than those infected with the cutaneous, or skin, form of the disease.
His research indicates that religious people, defined as those who regularly attend services, have stronger immune systems, are less susceptible to depression and stress, and may recover faster from health problems.
Women have stronger immune systems, for example, making them less likely to succumb to infection but more likely to suffer from auto-immune diseases, such as rheumatoid arthritis and multiple sclerosis.
