3d
aids
antibody
biology
blood
blood transfusion
cell
closeup
colorful
concept
conceptual
disease
electron microscopy
epidemic
erythrocytes
fever
germ
health
healthcare
hiv
human
human immunodeficiency
illness
illustration
immunodeficiency
immunoglobulin
infection
infectious disease
medical
medicine
microbe
microbiology
microorganism
microscope
model
red blood cells
render
science
scientific
sexually transmitted
sick
symptoms
treatment
viral
virology
virus