Hi, First of all, there are 2 kinds of CJD--classic and new variant. The classic form can be spread via surgical instruments that come into contact with infected CNS tissue. The best evidence indicates it can't be spread via lung secretions or casual contact. New variant CJD can be spread via infected meat from cattle, and possibly blood transfusions. There is no evidence this form can be spread via lung secretions or through casual contact. No cases of new variant CJD have been acquired in the U-S--most are in Britain.