World AIDS Day brings together people from around the world to raise awareness about HIV/AIDS and demonstrate international solidarity in the face of the pandemic.

Celebrated annually, the World Antimicrobial Awareness Week (WAAW) aims to increase awareness of global antimicrobial resistance and to encourage best practices among the general public, health workers and policy makers to avoid the further emergence and spread of drug-resistant infections.

World Patient Safety Day calls for global solidarity and concerted action by all countries and international partners to improve patient safety.

The Day brings together patients, families, caregivers, communities, health workers, health care leaders and policy-makers to show their commitment to patient safety.

The resolution WHA 72.6 ‘Global action on patient safety’ recognizes patient safety as a global health priority and endorses the establishment of World Patient Safety Day to be observed annually on 17 September.

World Hepatitis Day, 28 July, is an opportunity to step up national and international efforts on hepatitis, encourage actions and engagement by individuals, partners and the public and highlight the need for a greater global response as outlined in the WHO's Global hepatitis report of 2017.

The date of 28 July was chosen because it is the birthday of Nobel-prize winning scientist Dr Baruch Blumberg, who discovered hepatitis B virus (HBV) and developed a diagnostic test and vaccine for the virus. 

Every year countries around the world celebrate World Blood Donor Day (WBDD). The event serves to raise awareness of the need for safe blood and blood products and to thank voluntary, unpaid blood donors for their life-saving gifts of blood.

A blood service that gives patients access to safe blood and blood products in sufficient quantity is a key component of an effective health system. The global theme of World Blood Donor Day changes each year in recognition of the selfless individuals who donate their blood for people unknown to them.

This yearly celebration informs the public on the dangers of using tobacco, the business practices of tobacco companies, what WHO is doing to fight the tobacco epidemic, and what people around the world can do to claim their right to health and healthy living and to protect future generations.

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.