World Immunization Week, celebrated in the last week of April, aims to highlight the collective action needed and to promote the use of vaccines to protect people of all ages against disease.

Through its convening power, WHO works with countries across the globe to raise awareness of the value of vaccines and immunization and ensures that governments obtain the necessary guidance and technical support to implement high quality immunization programmes.

World Malaria Day is an occasion to highlight the need for continued investment and sustained political commitment for malaria prevention and control. It was instituted by WHO Member States during the World Health Assembly of 2007.

Chagas disease, also known as "silent or silenced disease", affects mainly poor people without access to health care or people without a political voice. The disease progress slowly and often shows an asymptomatic clinical course. Without treatment, Chagas disease can lead to severe cardiac and digestive alterations and become fatal. Raising awareness of the disease is essential to improve the rates of early treatment and cure, together with the interruption of its transmission.

The World Chagas Disease Day was celebrated for the first time in 2020.

It is celebrated annually and each year draws attention to a specific health topic of concern to people all over the world.

The date of 7 April marks the anniversary of the founding of WHO in 1948.

Each year we commemorate World TB Day to raise public awareness about the devastating health, social and economic consequences of tuberculosis (TB) and to step up efforts to end the global TB epidemic.

The date marks the day in 1882 when Dr. Robert Koch announced that he had discovered the bacterium that causes TB, which opened the way towards diagnosing and curing this disease.

On 31 May 2021, the World Health Assembly (WHA) recognized 30 January as World Neglected Tropical Disease (NTD) Day through decision WHA74(18).

This decision formalized 30 January as a day to create better awareness on the devastating impact of NTDs on the poorest populations around the world. The day is also an opportunity to call on everyone to support the growing momentum for the control, elimination and eradication of these diseases.