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H5N1 is a circulating avian influenza A that has recently (early 2023) infected several mammal populations. However, it has previously infected over 800 humans in the past two decades. These infections were avian to human. At this current time, there has been no documented cases of human to human transmission. The previous human infections can be found here: https://www.cdc.gov/flu/avianflu/char...