Monkeypox

The International Day of Happiness is a global event arranged by the United Nations annually every 20th of March.

Dengue viruses spread to people through the bite of an infected Aedes species mosquito: Aedes aegypti and Aedes albopictus. Dengue is the fastest spreading vector-borne disease in the world endemic in 100 countries.

All viruses, including SARS-CoV-2, the virus that causes COVID-19, change over time. The changes may affect the virus's properties, such as how easily it spreads, the associated disease severity, or the performance of vaccines, therapeutic medicines, diagnostic tools, or other public health and social measures.