If it's wilting it's not a virus. It must be a wilt disease. Fusarium is most common, but could be also verticilium or one of the bacterial wilts. Compare symptoms and see what fits best.
I think overall that spot is doomed for tomatoes for years to come if that's the case. Either use resistant varieties, grafted, use a systemic fungicide against fusarium, pray for a very cold winter, etc.
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