Strains of the influenza virus that primarily infect birds, but can also infect humans.
This type of flu is most often contracted by contact with sick birds. It can also be passed from person to person. What is this dieasese?

This dieasese is called the bird flu. It is very rare. Fewer than 1,000 cases occur in the US every year. Hope this helps!

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds