In the absence of satisfactory combined vaccine testing methods, new testing methods should be developed as soon as possible to determine the content or potency of each component.
In the absence of satisfactory combined vaccine testing methods, new testing methods should be developed as soon as possible to determine the content or effectiveness of each of the parts.
In the absence of satisfactory joint vaccine testing methods, the new detection method should be developed as soon as possible to determine the content or potency of each component.<br>