What you need to know about chicken pox

Chickenpox is very contagious, this is according to Centers for Disease Control and Prevention (CDC).

If one person has it, up to 90% of the people close to that person who are not immune will also become infected. 

"Chickenpox can also be serious, even life-threatening, especially in babies, adolescents, adults, pregnant women and people with weakened immune systems," CDC says.