 Common head lice treatment can also work against HIV, influenza, dengue fever, and the Zika virus. So how does it work? Well, the theory is that the virus, it affects SARS-CoV-2 virus that causes COVID. But don't get ahead of yourself. The two-time Nobel Peace Prize winning drug is just a horse dewormer. Remember. Yeah, that's right. That's right. Ivermectin.