蛋鸡类禽流感流行的主要原因？
<SPAN lang=EN-US style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN"><FONT face=宋体 size=3>1北方地区种鸡感染淋巴白血病升高，净化措施不利！ </FONT></SPAN><DIV class=O v:shape="_x0000_s1026"><DIV style="mso-line-spacing: '100 50 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><DIV style="mso-line-spacing: '90 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'"><FONT face=宋体 size=3></FONT></SPAN></DIV><DIV style="mso-line-spacing: '90 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'"><FONT face=宋体 size=3>中型种鸡场阳性率30-50%，小型为40-60%。 </FONT></SPAN></DIV><DIV style="mso-line-spacing: '90 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'"><FONT face=宋体 size=3></FONT></SPAN></DIV><DIV style="mso-line-spacing: '90 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN lang=EN-US style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN"><FONT face=宋体 size=3>2高峰期蛋鸡抗病力下降到最低谷，感染无法控制！ </FONT></SPAN></DIV><DIV style="mso-line-spacing: '90 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'"><FONT face=宋体 size=3></FONT></SPAN></DIV><DIV style="mso-line-spacing: '90 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN lang=EN-US style="FONT-SIZE: 20pt; FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 楷体_GB2312; mso-fareast-font-family: 楷体_GB2312; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN"><FONT face=宋体 size=3>3 造成长期依赖抗病毒药物，常规抗病毒药物出现耐药性！</FONT></SPAN></DIV></DIV></DIV> ‘高峰期蛋鸡抗病力下降到最低谷’，这句话在描述上虽然有些‘重’，但能意识到这一点难能可贵，由此采取的管理措施悠然而生，卡住这个阶段很容易；相反、什么新母鸡病、蛋黄把抗体带走了、乱七八糟的一大套就出来了....。
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