Multiplication of the waterborne pathogen Cryptosporidium parvum in an aquatic biofilm system.

However, after six days, Cryptosporidium- exposed biofilms contained 2–3 fold more Cryptosporidium than that of the biofilm-free controls, which reflected a highly significant (P < 0.001) increase in parasite numbers when a biofilm was present (Figure 4 ).

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