Transfer to new places is usually in the personal items of the human they feed upon. Dwellings can become infested with bed bugs in a variety of ways, such as:

Bugs and eggs inadvertently brought in from other infested dwellings on a visiting persons clothing or luggage;
Infested items (such as furniture especially beds or couches, clothing, or backpacks) brought into a home or business;
Proximity of infested dwellings or items, if easy routes are available for travel, e.g. through ducts or false ceilings;
Wild animals (such as bats or birds) that may also harbour bed bugs or related species such as the bat bug;
People visiting an infested area (e.g. dwelling, means of transport, entertainment venue, or lodging) and carrying the bugs to another area on their clothing, luggage, or bodies. Bedbugs are increasingly found in air travel.Though bed bugs will opportunistically feed on pets, they do not live or travel on the skin of their hosts, and pets are not believed to be a factor in their spread. Diagnosis
A definitive diagnosis of health effects due to bed bugs requires a search for and finding of the insect in the sleeping environment as symptoms are not sufficiently specific. It is difficult to distinguish bed bug bites from other arthropod bites and the linear pattern of bites (known colloquially as "breakfast, lunch and dinner" bites) is not specific for bed bugs. If the number in a house is large a pungent sweet odour may be described. There are specially trained dogs that can detect this smell.
Neonatal Hemochromatosis is a rare and severe liver disease of unknown origin, though research suggests that it may be alloimmune condition. Its characteristics are similar to hereditary hemochromatosis, where iron deposition causes damage to the liver and other organs and tissues. Causes
The causes of neonatal hemochromatosis are still unknown, but recent research has led to the hypothesis that it is an alloimmune disease. Evidence supporting this hypothesis includes the high rate among siblings (>80%). This evidence along with other research indicates that neonatal hemochromatosis could be classified as a congenital alloimmune hepatitis. Diagnosis
Differential diagnosis
The condition is sometimes confused with juvenile hemochromatosis, which is a hereditary hemochromatosis caused by mutations of a gene called hemojuvelin. While the symptoms and outcomes for these two diseases are similar, the causes appear to be different. Treatment
Effective treatment of the disease has been confined to liver transplants. Success has also been reported with an antioxidant chelation cocktail, though its effectiveness cannot be confirmed. Based on the alloimmune cause hypothesis, a new treatment involving high-dose immunoglobulin to pregnant mothers who have had a previous pregnancy with a confirmed neonatal hemochromatosis outcome, has provided very encouraging results. References
Further reading
Andrews N (1999). "Disorders of iron metabolism". New England Journal of Medicine. 341 (26): 1986–95. doi:10.1056/NEJM199912233412607. PMID 10607817. link

External links
Hemachromatosis page at the National Center for Biotechnology Information