Chavis joins Saquon Barkley and Grant Haley with the Giants, becoming the 14th Nittany Lion to find an NFL home since the start of the NFL Draft.
The disease is classified as rare, but it often goes undiagnosed because its symptoms, including chest pains and shortness of breath, are similar to those of other common diseases.
Penn State was one of eight schools to have at least six players drafted, and seven other players signed NFL contracts as undrafted free agents.
Curtis Cothran has signed on with the Minnesota Vikings following the conclusion of the NFL Draft.
Parker Cothren is joining Marcus Allen in Pittsburgh after signing a pro deal with the Steelers.
Davis will join the Bills' Mafia to begin his professional career after scoring 261 points in three seasons as a Nittany Lion.