Homeless intravenous drug users are at high risk for<unk>  infections, particularly B. elizabethae. B. elizabethae seropositivity rates in this population range from 12.5% in Los Angeles, to 33% in Baltimore, Maryland, 46% in New York City, and 39% in Sweden.
Bartonella
Salmonella
Cryptosporidium
Listeria monocytogenes
Legionella
Mycoplasma
Edwardsiella 
Yersinia pestis