Prevalence
The WildList, an organization tracking computer viruses, never reported Westwood as being in the field. However, its isolation was made after the virus had made infections in the community of Westwood. It is unknown how much Westwood spread outside California (with a few reports in neighbouring states), especially as Westwood is easily mis-diagnosed as Jerusalem.
Since the advent of Windows, even successful Jerusalem variants have become increasingly uncommon. As such, Westwood is considered obsolete.
Read more about this topic: Westwood (computer Virus)
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