It's supposed to have red blood cells that transport oxygen, and white blood cells that come in all of the following
different shapes and sizes:
Macrophages: These swallow bacteria and harmful agents.
Alveolar macrophages: These are in the lungs where respiratory viruses have a strong affinity.
Lymphocytes (B cells and T cells): The T cells are specially good at fighting viral infections and coordinating the attack. Your B cells make antibodies to protect you from repeated infection.
Neutrophils: First on the scene! Also called granulocytes because they dump granules out to kill invaders.
These are all normal components of your bloodstream.