Little Vaccine Essentials

摘要

When you're planning a large vaccine drive, predictability is vital. The immunization campaign that allowed India to eradicate polio in 2014, for example, worked methodically through the country's populace of hundreds of millions of children, backed by a bank of knowledge about how the virus behaved, what the vaccine's properties were, and where new cases could be found. Such factors dictate not only how much vaccine is manufactured but also the production of a host of ancillaries: chemical additives such as adjuvants; hypodermics, glass vials, rubber stoppers, and other parts of an injection kit; and storage equipment such as deep freezers. Without this gear, a vaccine is just a fine formula, a cure in search of its disease.