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Watch for worsening pain and spreading redness beyond the immediate area after 48 to 72 hours, fever, a hard warm lump, or systemic allergic symptoms such as hives, facial swelling, throat tightness, or breathing difficulty

doi: 10.1186/s12879-021-06681-9

In more advanced cases, facial palsy, nerve pain, or sensitivity to light as well as sound

Stability at a glance: Lyophilized powder at minus 20C: stable for many months Bacteriostatic water solution at 2 to 8C: roughly 28 days Sterile water solution at 2 to 8C: a few days at most Single-use aliquots frozen at minus 20C: the longest option, but freeze only once Proper Documentation and Labeling Methods Good records turn a vial into reliable data