In desperate times, there are many ways to stretch vaccines and speed up inoculation campaigns, according to experts who have done it.
Splitting doses, delaying second shots, injecting into the skin instead of the muscle and employing roving vaccination teams have all saved lives — when the circumstances were right.
During cholera outbreaks in war zones, Doctors Without Borders has even used "takeaway” vaccination, in which the recipient is given the first dose on the spot and handed the second to self-administer later.