Headquarters of WHO is geneva, Switzerland.
WHO’s Constitution came into force on 7 April 1948 – a date we now celebrate every year as World Health Day.

WHO is an inter-governmental organization and works in collaboration with its member states usually through the Ministries of Health.
The World Health Organization is responsible for providing leadership on global health matters, shaping the health research agenda, setting norms and standards, articulating evidence-based policy options, providing technical support to countries and monitoring and assessing health trends.