Question

If 0.5 ml of a mumps virus vaccine contains 5000 units of antigen, how many units would be present in each milliliter if the 0.5 ml of vaccine was diluted to 2 ml with water for injection?

Answer 1

5000 units of antigens are present in 0.5 mL of the mumps virus vaccine.

Volume of the vaccine after dilution with water = 2 mL

0.5 mL has 5000 units antigen. So when 0.5 mL was diluted to 2 mL, the final vaccine after dilution would contain 5000 units of antigen.

Units of antigen present in 1 mL vaccine sample

= $1 mL *\frac{5000 units}{2 mL} = 2500 units$

Therefore, 2500 units of the antigen will be present in each milliliter, if 0.5 mL of the vaccine is diluted to 2 mL with water for injection.