Hello, Thank you for posting on HCM The description of your scenario is sounds very weird and requires thorough investigations especially on your new environment. I am not very familiar to Arkansas or it environs but what I can say is that after someone has traveled from an old environment (with generally no ill health) and goes to another environment and begins to develop viral infections and/or allergies, then it is most probable due to this environment. Children generally have weaker immune systems than adults reason why they are the ones suffering from the problems. You need to find out about your previous neighbors and how they were doing in that home. If they had any small children with similar problems. Your children are obviously presenting with viral flu ( respiratory and gastroenteritis) and hives being allergies, this simply showing that your environment is infested with factors that affect the weaker ones. You will need a health team with expertise in disease control to check your home thoroughly ( clothing, war-drops, bed sheets etc. Viral upper respiratory tract infection can lead to pneumonia. Hope this helps