Nine in 10 people who practice open defecation live in rural areas.
According to the Bill & Melinda Gates Foundation, 2.5 billion people, 40% of the world's population, practice open defecation.
In the portion of practice open to reporters Wednesday, Vick wore a visor instead of a helmet, and tossed a ball with a coach.
Last week, Griffin moved relatively well during the portions of practice open to reporters, but then Cousins would take the first-team snaps once the session was closed.
Umenyiora, who is recovering from arthroscopic knee surgery on Aug. 19, participated in all teams drills during the portion of practice open to the news media.
During the session of practice open to reporters on Thursday, Manning appeared unaffected by whatever might have been bothering him the day before.
There was perhaps a small sign of promise: Stokley rode on a stationary bicycle during the portion of practice open to reporters on Friday.
But around the world, almost one billion people still practice open defecation, which can lead to contaminated water sources and the spread of diseases such as cholera, diarrhoea, dysentery, hepatitis A and typhoid.
Cassel took part in drills during the part of practice open to reporters at San Jose State, where the Patriots (8-5) are training between games at Seattle and Oakland.
The players seemed in good spirits and, during the portion of the practice open to the news media, bounced around and laughed with one another, particularly as they participated in a small-sided game of rugby.
Haden, who was suspended for four games by the N.F.L. earlier this season for failing a drug test, was not on the field for the part of Thursday's practice open to the news media.
