What is " maggot therapy"?

[shanahan]

St. nick abbey is hanging in there - one of my favs - but I don\'t know what this is.
Trainers on the board, can you help me understand this term?

[gohorse]

http://www.monarchlabs.com/equinedressings.htm

http://performanceequinevs.com/unique-services/maggot-therapy.html

[kekomi]

if you\'ve seen gladiator, the african who rescues russell crow uses maggots to clean russell crow\'s wound--he packs it full of maggots.