Pathogenic E. coli strains use a multi-step scheme of pathogenesis that is similar to that used by other mucosal pathogens, which consists of colonization of a mucosal site, evasion of host defences, multiplication and host damage.
Research suggests that autism can be reliably diagnosed by age 2, but this study found that fewer than half of children with autism are diagnosed by age 5. Autism is a complex neurodevelopmental disorder that affects as many as 1 in 88 U.S. children, according to the U.S. Centers for Disease Control and Prevention.
A: With careful evaluation by an expert, diagnosing a child younger than 2 with autism is possible. More often, however, autism is identified in children between the ages of 2 and 3. The signs and symptoms of autism vary quite a bit, depending on the severity of the disease and the individual child.