English to German Medical Biology (-tech,-chem,micro-)

"Serial passage refers to the process of growing bacteria or a virus in iterations. For instance, a virus may be grown in one environment, and then part of that virus can be removed and put into a new environment. This process is repeated with as many stages as desired, and then the final product is studied, often in comparison with the original virus."

Wie kann man das auf Deutsch ausdrücken? Serielle Weitergabe?
Brauch schnelle Hilfe. Danke :)