00635nas a2200253   4500000000100000008004100001260001700042653001500059653003000074653001800104653001600122653002200138653001100160653002000171653001200191653001100203100002300214700001400237700002500251245007300276300001100349490000700360022001400367       1970                            d  c1970 Jul-Sep10aAntibodies10aComplement Fixation Tests10aDown Syndrome10aHepatitis A10aHepatitis B virus10aHumans10aImmunodiffusion10aleprosy10aMexico1 aSalazar M-allén M1 aEscobar A1 aSomolinos Palencia J00a[Study of the Australia factor among the population of Mexico City].  a189-960 v30  a0034-8384