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How is the positive result indicated in slide agglutination reaction?

How is the positive result indicated in slide agglutination reaction? Correct Answer Clumping of the particles

Slide agglutination involves the presence of a slide or tile on which a drop of antiserum is added to suspension of antigen under saline conditions. If this results in formation of clumps it indicates the initiation of agglutination reaction. This reaction may take a few seconds depending on the serum used. In other words, we can say that, if we observe clumping or clumped molecules, it results in agglutination reaction.   

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