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.
Children with autism do not follow the typical patterns of child development. In some, signs of future problems may be apparent from birth. Other children develop typically at first, but between the ages of 18 and 36 months, their development stagnates.n other cases, there is a plateau or leveling of progress, and the difference between the child with autism and other children the same age becomes more noticeable. A recent study of a U.S. metropolitan area estimated that 3.4 of every 1,000 children ages 3 to 10 had autism.