Anyone knew Omegas were more vulnerable than Betas or Alphas.

So when a virus breaked out, it was so serious that everyone has been escorted to their den.

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The virus was named 'Black Mamba.' It affected wolf hybrids, especially wolf packs and pregnant omegas by a black liquid blooming underneath areas of the skin until the person got intoxicated.

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Katsuki and a 4 month pregnant Izuku were now just getting trapped up in their den,for their safety.