Changes

# Sample serum is added- class-specific antibody in the serum binds to antiglobulin

# Sample serum is added- class-specific antibody in the serum binds to antiglobulin

# Wash

# Wash

# Antigen is added- attaches to specific antibody  

# Antigen is added - attaches to specific antibody  

# Wash

# Wash

# Enzyme-labeled antibody is added

# Enzyme-labeled antibody is added