Influence of a thymus polypeptide extract (TP1) on immunogenesis and on experimental influenza infection in x-rayed animals.

The thymus polypeptide extract TP1 administered to X-rayed animals shows a protecting effect on the level of serum anti-influenza antibodies in the rats inoculated with A2 influenza vaccine and reduces the haemagglutinating titres in the mice inoculated with the A PR8 influenza virus.