Which of the following is NOT true about vaccinations:

W) they were first developed against viral infections such as small pox

X) they allow the immune system to respond more quickly and effectively on exposure to the disease causing agent

Y) they will typically protect the person from infection within 24 hours after vaccination

Z) they often require adjuvants which are nonspecific irritants for best results
Y) THEY WILL TYPICALLY PROTECT THE PERSON FROM INFECTION WITHIN 24 HOURS AFTER VACCINATION