A highly contagious infection that is spread through tiny particles of fecal matter has broken out in Portland - with officials warning that the homeless population are most at risk of catching the illness. Shigella is a bacteria that spreads through human feces. People transmit the infection after getting the microbes on their hands and then touching their mouths. People can also spread the intestinal infection through sexual intercourse. Multnomah County in Oregon has warned that homeless people and same-sex male partners are most at risk because of their lack of access to hygienic facilities. In the last month, 45...