Parasites are a comorbidity of Covid-19. Ivermectin is an anti-parasitic. You'll slightly improve your chances against Covid-19 by treating the parasites with Ivermectin so your body doesn't have to fight those, too. Parasites are endemic in Brazil in the South where Itajaí is located and Ivermectin is in heavy usage pre-pandemic as a result.

We already knew this. This doesn't apply outside areas with endemic parasites. It doesn't apply here in the US.