"Another interesting field, which is my own, is cofactors, not only to the disease but also to transmission. I am still puzzled by the fact that you get more sexual transmission in some ethnic populations. One way to answer this is to look for genetic factors"

Luc Montagnier is describing the field of cofactors, which are factors that can influence the development or transmission of a disease. He is particularly thinking about the reality that some ethnic populations have higher rates of sexual transmission of a disease. He recommends that a person way to address this question is to try to find genetic factors that may be affecting the transmission. This might include taking a look at the hereditary makeup of the population and how it affects the transmission of the illness. It might likewise include taking a look at environmental factors, such as access to health care, that might be influencing the transmission. By taking a look at the hereditary and environmental aspects, it may be possible to acquire a better understanding of why some populations have higher rates of sexual transmission.