They are very well known and widespread. In summer it is impossible to avoid them in many countryside areas and the best way to deal with them is to shower immediately you are indoors and put all your clothing in for a wash because they are still there, particularly in underwear and anything worn below the waist. Preventative measures (before going out) include using insecticide on clothing from about the knee downward and on footwear, plus (if this is an option) tucking trousers into long socks. It is the powerful enzyme chiggers injecect into our skin when biting that causes the itch as we try to eliminate it and heal. The enzyme liquefies a tiny area of skin and they suck it up (nice ?).