In the latest international COVID-19 developments, South Africa health officials announced they will share the country's AstraZeneca-Oxford vaccine with other African nations, and in Europe, Johnson & Johnson submitted its request for an emergency use authorization for its single-dose COVID-19 vaccine.South Africa switch includes study of J&J vaccineSouth Africa recently announced a pause on the rollout of AstraZeneca-Oxford vaccine, following early study findings that it appears have little impact on mild-to-moderate disease from the B1351 variant that is dominant in the country.It followed that development with an announcement that it would temporarily switch to using the unapproved Johnson & Johnson vaccine.