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pro vyhledávání: '"E P Theios"'
Publikováno v:
American Journal of Public Health and the Nations Health. 57:295-300
Activated sludge sewage treatment process was found to be far superior to trickling filtration for removal of trivalent oral polioviruses. Excretion of such viruses was observed to continue for at least 56 days after vaccination. Considerable variati