Adrian Peterson to start against Detroit Lions

— -- DETROIT -- Minnesota Vikings running back Adrian Peterson, who was downgraded to questionable because of an illness Saturday night, is active and started Sunday's game against the Detroit Lions.

Peterson became sick on Saturday evening after reportedly swallowing chewing tobacco juice during a turbulent flight on the team's charter, Fox Sports reported Sunday. That caused him to vomit upon the team's arrival in Detroit.

Sources close to Peterson had figured it would take much more than an illness to keep him off the field.

The running back's tenacity has never been in much doubt. He played the second half of his MVP season in 2012 with a sports hernia and lobbied to get back on the field in December 2013, a week after sustaining a midfoot sprain that typically would keep players out for several weeks. As one person close to Peterson put it, "Adrian is Adrian."

The running back has logged 1,392 yards on 264 carries in 13 career games against the Lions. In his last game at Ford Field, Peterson took the opening carry of the 2013 season 78 yards for a touchdown.