The source is most likely the primary infection for the suspected organism deep wound cellulitis.
Agglutination happens when an antibody interacts with an insoluble or particle antigen. Rapid macroscopical detection of a positive reaction is possible. The antigen-antibody complex, however, might be visible to the blind eye if it is a large complex. IgM or IgG may both contribute to the agglutination reaction.
Bile solubility testing can be used as a confirmatory test after Gram stain, catalase, and optochin tests have successfully identified S. pneumoniae. Serological tests can be used to determine the serotype if these results show that the isolate is S. pneumoniae.
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