Can a prison official be held liable for injuries sustained by an inmate as a result of unsafe conditions of confinement?

Where a prisoner alleges injuries stemming from unsafe conditions of confinement, prison officials may be held liable only if they acted with "deliberate indifference to a substantial risk of serious harm." Frost v. Agnos, 152 F.3d 1124, 1128 (9th Cir.1998). The deliberate indifference standard involves an objective and a subjective component. First, the alleged deprivation must be, in objective terms, "sufficiently serious." Farmer, 511 U.S. at 834 (citation omitted). Second, the prison official must "know of and disregard an excessive risk to inmate health or safety." Id. at 837. Thus, "a prison official may be held liable under the Eighth Amendment for denying humane conditions of confinement only if he knows that inmates face a substantial risk of harm and disregards that risk by failing to take reasonable measures to abate it." Farmer, 511 U.S. at 835.