Korea set to begin mass vaccination this week Posted : 2021-02-23 10:20 Updated : 2021-02-23 10:20 Members of Korean Health and Medical Workers' Union attend a rally calling for measures to expand manpower at the coronavirus hospitals and improve their working conditions outside of National Assembly in Seoul, Feb. 17, 2021. AP South Korea will begin its first inoculations against the novel coronavirus later this week, health authorities said Tuesday, adding it might not be able to achieve herd immunity by November. The Korea Disease Control and Prevention Agency (KDCA) said it will launch the free inoculation program with British-Swedish pharmaceutical giant AstraZeneca's vaccine Friday and with U.S. pharmaceutical company Pfizer Inc.'s vaccine Saturday.