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The drastic increase in the number of people diagnosed with autism, especially in developed countries in...

The drastic increase in the number of people diagnosed with autism, especially in developed countries in the last 20 years, can only be due to some new environmental exposure (e.g. a toxic chemical or a teratogen) in these developed countries. Discuss the merits of this statement? reference please

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According to SAARC (Southwest Autism Research Resource Center) back in 1997, autism cases estimates were suggested to 1 in 2,500 children.

But later after year 2000, the Centers for Disease Control and Prevention (CDC) started to track the Autism. Today, it is reported that one 1 in 68 children is identified with autism spectrum disorder (ASD).

The age of diagnosis is also drastically reduced, eralier it was about 4 years and 4 months but now it is about 3 years 10 months.

Althought there is a clear genetic contribution in ASD but a study, published in year 2014 in Translation Psyciatry, states about the relation of gene-environment interaction in ASD.  one study shows that environmental factors can account 55% of the risk for developing ASD and 37% for genetic factors.

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