SAN ANTONIO -- Lackland Air Force Base reported Monday that 100 people have tested positive for a rare strain of "boot camp flu".

Air Force officials alerted the centers for disease control that since March 1, 100 people had been infected with Adenovirus 14.

Doctors said that there are few published reports of the strain.

Over the years, other strains such as Adenovirus 4 and 7 are more commonly reported at military bases, doctors said.

Officials said 29 trainees are currently on bed rest, but there were nearly 60 recovering from the flu two weeks ago.

Brig. Gen. Darrell Jones said he's not concerned, but several precautionary measures are being taken at the base.

"When trainees exhibit any symptoms -- headaches, fever, sore throat, cough -- we put them on bed rest," Jones said. "The average person stays there about 2 1/2 days."

Jones said they're also making sure people wash their hands to avoid passing on the virus.

Jones said the number of people being treated for the virus has decreased.