Title: Calculating quantities of vaccine for a particular supply period
Course: Immunization - Ethiopia (Full)

Calculating quantities of vaccine for a particular supply period

The vaccine needs for a specific storage or supply period (in this case, 12 months or 48 working weeks) can be calculated using the following equation:

q_period = (q_year ÷ 12) x p_supply when the supply period is given in months, or q_period = (q_year ÷ 48) x p_supply when the supply period is given in working weeks. where:

- q_period = vaccine needs for the period
- q_year = annual vaccine needs
- p_supply = supply period (in months or weeks).

You can see an example of vaccine needs calculated in weeks in the following question.

If the number of doses of vaccine required for one year in an imaginary kebele is 2,000, how many doses would be needed for a two-week period?

Show answer

In this example, the annual vaccine needs q_year = 2,000 and the supply period p_supply is 2 weeks.

The vaccine needs for one week would be 2,000 doses ÷ 48 working weeks.

So the vaccine needs for the period (q_period) of 2 weeks is (2,000 ÷ 48) x 2 = 83 doses.

Therefore, 83 doses would be required for a two-week period in this example.