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Re:Why are we 'milking' crabs for a coronavirus vaccine? by sock on Wednesday July 08, 2020 @04:44PM (#23774046)
This isn't specifically for coronavirus, from wikipedia

> Amebocytes from the blood of L. polyphemus are used to make Limulus amebocyte lysate (LAL), which is used for the detection of bacterial endotoxins in medical applications.

There's a nice video here on it (3:22) https://www.youtube.com/watch?v=LgQZWSlLBnA