Fractional or lower dosing has been used around the world for years as a means to overcome vaccine shortages.
![A woman receives a dose of the AstraZeneca COVID-19 vaccine during a mass vaccination in Mexico City [File: Edgard Garrido/Reuters]](/wp-content/uploads/2021/07/2021-07-06T201637Z_962122432_RC21FO9R5UJY_RTRMADP_3_HEALTH-CORONAVIRUS-MEXICO-VACCINE.jpg?resize=270%2C180&quality=80)
Fractional or lower dosing has been used around the world for years as a means to overcome vaccine shortages.
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