What is the standard of deliberate indifference of a prison official in the context of medical malpractice cases?

The deliberate indifference standard involves both an objective and a subjective prong. First, the alleged deprivation must be, in objective terms, "sufficiently serious." Id. at 834. Second, subjectively, the prison official must "know of and disregard an excessive risk to inmate health or safety." Id. at 837; Anderson v. County of Kern, 45 F.3d 1310, 1313 (9th Cir. 1995). To prove knowledge of the risk, however, the prisoner may rely on circumstantial evidence; in

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fact, the very obviousness of the risk may be sufficient to establish knowledge. Farmer, 511 U.S. at 842; Wallis v. Baldwin, 70 F.3d 1074, 1077 (9th Cir. 1995).