aggregation of strep. mutans by antibody

Antibodies bind to bacteria and viruses and can prevent infections in several different ways. One way they can do this is by causing aggregation so all the bacteria clump together. The left hand panel shows Streptococcus mutans in the absence of antibodies and the right hand panel shows their aggregation in the presence of the anti Streptococcus mutans antibody produced in transgenic tobacco.