Final answer:
The most effective and safest means of preparing a sterile solution of the new medication is by using a molecular subunit of the virus.
Step-by-step explanation:
The most effective and safest means of preparing a sterile solution of the new medication would be to use a molecular subunit of the virus. This involves extracting the protein from a whole virus culture and injecting it into a person to elicit an immune response. This method is safer because it only contains a single antigenic molecule and does not contain any part of the genome of the pathogen.