Which disease shows a symptom of forming a white layer on the tongue and in the throat?

The tissue that covers the teeth root and helps to anchor into the bone

The hard white material covering of the teeth

Vaccine was invented by

Pertussis is also known as

Which multiply faster and are smaller than bacteria?.

The other name of influenza is

Which is the disease spread by microorganisms?

Vaccine is a

Communicable diseases are spread by