Abstract
Infection of chicken embryonic heart, lung and liver cells with parainfluenza 1 and 3 viruses revealed that the most susceptible (S) cell is the heart cell and the least susceptible (LS) cell is the liver cell. The results of these experiments are similar to observations where the S and LS cell for another paramyxovirus, mumps virus, were also cultivated from the chicken embryonic heart and liver, respectively.