$4k is excessive but human immunoglobulin is famously expensive as it has to be extracted from human blood plasma, essentially a micro blood transfusion. The r

$4k is excessive but human immunoglobulin is famously expensive as it has to be extracted from human blood plasma, essentially a micro blood transfusion. The rabies vaccine is different and costs much less, if you get vaccinated before exposure then you don't need the immunoglobulin if you later get exposed.