DEBRIS.COMgood for a laugh, or possibly an aneurysm

In an article about the transmission of SARS, Sudden Acute Respiratory Syndrome, Rob Stein of the Washington Post writes:

…although the primary route of SARS transmission is through droplets that infected people spray out when they sneeze or cough, scientists had detected evidence of the virus in feces and urine… That would provide an alternative explanation for how the disease spread rapidly through a Hong Kong apartment tower…

What sort of nasty plumbing problem allows for that leap of logic? Am I misreading something, or does the statement above imply that residents of the infected apartment building are exposed to neighbors’ toilet outflow on a regular basis?

The Voice of America confirms this disgusting hypothesis, in an article called Researchers Say Plumbing Helped Spread of SARS in Hong Kong:

Secretary for Health Yeoh Eng-kiong says most residents in the Amoy Gardens complex probably picked up the virus in their bathrooms, that large amounts of human waste carrying the virus went into the sewage system and leaked into apartments connected by toilet pipes.