Why the number of corona cases are more in West than in Asia?

Cause of lower corona infection in Asia:

SARS-CoV-2 was first reported from China. Within three months, it evolved to 10 additional subtypes. Two evolved subtypes (A2 and A2a) carry a non-synonymous Spike protein mutation (D614G).

A new study:

A phylodynamic analysis of over 70,000 SARS-CoV-2 coronaviruses worldwide, sequenced until July2020, and found that the mutant sub-type (614G) out competed the pre-existing type (614D), significantly faster in Europe and North-America than in East Asia. A study has concluded that:

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