Martha's Vineyard, Mass - Was it something he picked up at the White House official dinner for African heads of state last week? A sliver of some raw flesh delicacy from Ebola-torn Liberia perhaps?
"We caught him chewing on infected bush meat," a security source admitted, "maybe some sort of rancid muffin crumb from Valerie Jarrett's lap.
"The guy should have skipped the raw fish sushi course ...as well as the wife of the Liberian Prez."
In any case the Presidential security detail was taking no chances this morning as Obama showed up for a round of golf at the exclusive Vineyard Club.
Within seconds a battalion of Secret Service agents dressed in armored bio-hazard body suits began cattle-prodding local golfers.
And probing their bodies with medical tricorders in a rapidly erected quarantine zone tent.
"This is fucking ridiculous," a Tiger Woods lookalike commented.
"When are they sending Biden to hose down the john?"