As stated by Dr. Shoemaker as well, around 24 percent of the population is genetically susceptible to mold toxicity, as they have an immune response gene (HLA-DR).
Therefore, people with these genes have an increased risk of mold illness. This subgroup includes 95% of the cases of mold illness.
Also, there is 2 percent who are especially prone to it and have a “sicker quicker” variation of these genes. What’s more, if you are not vulnerable to mold illness, it still does not mean that you have zero chances to suffer from it.