Effective Vaccines Have Been Developed Against a Number of Deadly

Multiple Choice

Effective vaccines have been developed against a number of deadly diseases, including viral diseases such as measles, mumps, polio, and smallpox, as well as several bacterial infections. However, there remain several important infectious diseases for which vaccines are currently lacking. One important aspect of developing effective vaccines against these pathogens is:

A) The discovery of an attenuated form of the pathogenic organism
B) The purification of surface components of the pathogen
C) A clear understanding of the immune mechanisms required to eliminate the infection
D) The purification of toxins made by the pathogen
E) The development of more effective adjuvants to include in the vaccine