iodine can have a limited effect on infections in the body. if you are not taking 100mg per day then you should anyway. period.
an infection in the kidneys is likely to be fungal in nature, maybe a mycoplasm. collodal silver is the way to go since it kills fungus, mold, bacteria and viruses. you can buy a maker or pay about as much in buying premade in enough quantity to do you some good. buy a maker and every infection after that you can treat for free, basically.