71.   The prions, or infectious agents, that cause the condition can survive outside the body for years.

72.   The problem is that, in transplanting the liver or heart of a baboon or pig, infectious agents will surely be transplanted too.

73.   The steps that are being taken to monitor Getty for known and unknown infectious agents are those expected to be called for in the forthcoming federal guidelines.

74.   Their lab techniques tell if the infectious agent is polio and the age and origin of the strain.

75.   These are the ones that may allow the immune system of such a patient to respond to the specific infectious agents that cause opportunistic infections in AIDS.

76.   They donned white protective suits and worked in a maximum-security laboratory built with ventilation systems designed to protect against airborne transmission of virus and other infectious agents.

77.   Therefore, in the less purified form that was used in prior experiments, it was difficult to prove that a more conventional infectious agent was not involved.

78.   They give rise not only to the T cells and other components of the immune system, they also program cells to recognize a host of different infectious agents.

79.   This process, whereby antibody production helps rather than hinders infectious agents, has been dubbed enhancement.

80.   Troops exposed to infectious biological agents could pass the contagion on to unexposed troops, multiplying the ill-effects across the battlefield and deep into the rear echelons.