One virulence property of Borrelia burgdorferi is its resistance to innate immunity. in particular to complement-mediated killing. Serum-resistant B. burgdorferi express up to five distinct complement regulator-acquiring surface proteins (CRASP) which interact with complement regulator factor H (CFH) and factor H-like protein 1 (FHL1) or factor H-related protein 1 (CFHR1). https://hollandscountryclothinges.shop/product-category/horse-skin/