The 2023 Chicken Plague is a future event that will happen in 2023. The plague presumably depletes the chicken population drastically, or maybe even entirely.
The 2023 Chicken Plague is highly likely to be a pandemic plague, presumably causing the chicken species to go either severely endangered or extinct, as evident in Nora West-Allen's message on September 2, 2018 to Eobard Thawne in 2049, where she expressed her fulfillment for finally having chipotle for the first time. Even until 2049, the denizens of Earth have still not recovered from the situation.
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