00270nam a2200109Ia 4500008004100000040001100041100001400052245003200066260004200098300001200140300000800152251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aC. kaplan 0aJournal Of General Virology  c1970bThe University PressaCambridge  aP.1-264  bV.9