You don't get infection or disease because. 1- most of the people (and probably you too) are vaccinated and prevent the spreading of such disease. 2- Most of our current developed world is sanitize compare to back them 3- a cut could be lethal or could meant amputation in the middle age, now you just need to put alchool on it. 4- you might had suffer from malnutrition even has a monarch, lack of vitamin C could lead to scurvy in the winter and lack of iodine in the food might cause Iodine deficiency (wich lead to Goitre or Cretinism) If you your so keen of wanting to live that life style, you can find a sweet amish girl and go live in her community.