Patients were randomly assigned to receive 1 of 4 treatments : oral liquid formulation of NTCD-M3 , 10 ( 4 ) spores/d for 7 days ( n = 43 ) , 10 ( 7 ) spores/d for 7 days ( n = 44 ) , or 10 ( 7 ) spores/d for 14 days ( n = 42 ) , or placebo for 14 days ( n = 44 ) .