👤 Penttinen, Kari Keywords 🔗 viral antigen (73) Articles (1) Antibodies to Human Coronavirus OC43 Measured by Radiai Haemolysis in Gel 👤 Riski, Hellevi 👤 Hovi, Tapani 👤 Väänänen, Pertti 👤 Penttinen, Kari ⏰ 1977 📚 Scandinavian Journal of Infectious Diseases