Influenza Vaccine
Genetic analysis of influenza virus master donor strain reported
Published in Medical Letter on the CDC and FDA, July 18th, 2004
"For the past 3 decades the cold-adapted (ca) and temperature sensitive (ts) master donor strain, A/Leningrad/134/17/57 (H2N2) has been successfully used as the basis for the live attenuated reassortant influenza A vaccine. This donor strain was developed from A/Leningrad/134/57 (H2N2) wild-type (wt) virus following 17 passages in eggs at 25 degrees C. Our detailed investigation has revealed that the A/Leningrad/134/17/57 (Len/17) master donor stock is a mixed population comprised of numerous variants of the...
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