Use of temperature-sensitive and cold-adapted mutant viruses in immunoprophylaxis of acute respiratory tract disease.

Abstract excerpt

Efforts currently are underway to develop mutations in the influenza A viral genome that will bring about a satisfactory level of attenuation and that can be identified by simple in vitro techniques. Two types of donor viruses that bear such mutations are being evaluated. One donor virus possesses temperature-sensitive (ts) mutations on the P1 and P3 genes, while the other donor bears both ts and cold-adaptation...

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