2023年在美国蔓延的一种具有呼吸道症状的神秘狗病正在接受调查；病例正在减少（美国农业部不知道）。 A mysterious dog illness with respiratory symptoms spreading in the US in 2023 is under investigation; cases are declining (USDA unaware).

一种神秘的狗病于 2023 年开始在美国蔓延并导致呼吸道症状，目前仍在调查中。 A mysterious dog illness, which started spreading across the U.S. in 2023 and causes respiratory symptoms, is still under investigation. 然而，据报道病例数量正在下降。 However, the number of cases is reportedly declining. 这种疾病可导致严重或致命的呼吸系统问题，并经常导致肺炎。 The illness can lead to severe or fatal respiratory problems, and often results in pneumonia. 到目前为止，美国农业部尚未发现任何有关该问题的证据。 The U.S. Department of Agriculture has not seen any evidence of the issue so far.