. 2019 Mar 21;19:333. doi: 10.1186/s12889-019-6639-y

Table 1.

Evaluation timeline

	Phase 1 districts	Phase 2 districts
	Songinokhairkhan and Sukhbaatar	Bayanzurkh	Chingeltei
April 2015	Enhanced surveillance commences
	14 months pre-vaccine surveillance	26 months pre-vaccine surveillance	35 months pre-vaccine surveillance
June 2016	Vaccination commences	26 months pre-vaccine surveillance	35 months pre-vaccine surveillance
July 2017		Vaccination commences
March 2018			Vaccination commences