Evaluation of a phased pneumococcal conjugate vaccine introduction in Mongolia using enhanced pneumonia surveillance and community carriage surveys: a study protocol for a prospective observational study and lessons learned

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

ISSN: 1471-2458