Thank you for these resources from Ann. I realize that there are still so many unknowns about the characteristics of any future COVID-19 vaccine including, among many other things, the number of doses required per person, thermostability, cold chain volume per dose, uniformity of dose size irrespective of age (e.g., 0.5 ml for everyone?), liquid or lyophilized, duration of immunity, possible need for re-vaccination, whether immunity acquired from vaccination will be fast enough to protect people possibly exposed at crowded vaccination sites, etc.
However, we can already assume that everyone in the entire country will need to be vaccinated. EPI has no experience operating at that scale. So, while waiting for a COVID-19 vaccine to be developed, manufactured and distributed, I think each country should begin preparing now by identifying strategies for mass vaccination of their entire population and surge requirements likely to be needed. For example, if Egypt were to vaccinate every person in its entire population with one injection using single-use syringes, the number and volume of syringes to be distributed, used, safely collected and destroyed would be enormous. To help visualize the challenge, the syringes -- laid end to end -- would stretch from Cairo all the way to Johannesburg and half-way back again to Cairo!
Ministries of Health can already start thinking about the criteria (and how) to phase in a nationwide vaccination campaign (while possibly also implementing physical distancing), in case human resources and other systems supports are unlikely to be sufficient for vaccination everywhere at the same time. How will they prevent “leakage” to the black market? How will they keep track of individuals who get vaccinated, so that people do not try to return for extra unneeded doses on the assumption that “if one shot is good, two must be better”. How will they manage expectations, crowds, consistent and transparent communications? The list goes on. Amidst the current urgency of other preventive measures, patient care, and health worker safety, what will it take to get started with planning to be ready for nationwide mass vaccination of all age groups in each country?
Robert Steinglass
(retired, former Director, Immunization Center, JSI)