Medical research--a continuing challenge.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000209:etiology; D001249:Asthma / Q000209:etiology; D001315:Australia; D002648:Child; D002675:Child, Preschool; D004660:Encephalitis; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007922:Leptospirosis; D008297:Male; D008875:Middle Aged; D011565:Psoriasis / Q000209:etiology; D012106:Research; D014438:Typhus, Epidemic Louse-Borne