Autistic behavior is often accompanied by numerous disturbing symptoms on the 
part of gastrointestinal system, such as abdominal pain, constipation or 
diarrhea. These problems are often connected with deregulation of physiological 
microflora in intestine. The aim of this study was to determine differences in 
intestinal microflora of autistic and healthy children. Strains of Clostridium 
spp. and enterococci were isolated more frequently from stool samples of 
autistic children and rarely lactobacilli. Quantitative differences were 
observed maliny among staphylococci, Candida spp. and Clostridium perfringens. 
Monitoring and stabilization of intestinal microflora and knowledge about role 
of particular strains in etiology of autistic disorders can increase the chances 
for appropriate therapy.