Old diseases return.
Healy
P
P
D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology*; D005061:Europe, Eastern / Q000453:epidemiology; D015658:HIV Infections / Q000453:epidemiology; D006801:Humans; D011634:Public Health; D012426:Russia / Q000453:epidemiology; D014586:USSR; D014944:World Health Organization