Hundreds of billions of dollars have been spent for over three decades in the search for an effective human immunodeficiency virus (HIV) vaccine with no success. There are also at least two other sexually transmitted viruses. for which no vaccine is available. the herpes simplex virus (HSV) and the hepatitis C virus (HCV). https://poolsproductscanadas.shop/product-category/pentair-ultratemp-eti-parts/