MUTATION/MUATUE/MUTANT/ - changing of genes

Virus/Viral - Virus

Microorganism - Living thing.

Antibodies-Microorganism that helps to fight off virus.

Gradually-Happens slowly.

hitch-Problem, issue.

Subtype-another type of virus.

Antigenic shift-When a virus suddenly changes.

A virus is a tiny living organism that affects your blood cells.

There are three types of viruses like A,B & C.

Antibodies is a microorganism in your body that fight back against virus.

Antigenic shift-Type of viruses that can change into a new type of viruses during process that is called antigenic shift.

WHAT IS A VIRUS.