H1N1流感最早爆发于墨西哥和美国,感染该病患者会出现上呼吸道症状,随后在世界其他国家也相继出现确诊病例。病原产生的环境、促使跨种传播的因素仍未彻底明了,但可以明确的是在疾病爆发的早期,该病毒就能够直接在人间传播。来源于动 H1N1 flu first erupted in Mexico and the United States, the patient infected with the symptoms of upper respiratory tract, followed by other countries in the world have also confirmed the case. The pathogeny that causes the cross-species transmission is still not completely understood, but it is clear that the virus can spread directly in the early stages of a disease. From the move