Pensaert M
Tijdschr Diergeneeskd. 1978 May 1;103(9):473-9.
To begin with, possible approaches to the control of virus disease in swine are discussed in general. The choice of a method of control will be decided by various factors such as the ecological and geographical environment of the animal population, the epizootiological behaviour of the causative virus itself as well as economic and political considerations. These consist in definitely freeing the swine population and/or keeping it free from a particular virus, maintaining a particular virus in an enzootic state, promoting this enzootic state within the herd, vaccinating and, finally, combining the above procedures. In conjunction with the trend towards increasingly large piggeries, the equilibrium between natural or specific immunity of the animal population and various viruses is often upset to the advantage of the virus. The pressure of infection will increase unduly and the epizootiological behaviour of the virus in question will not infrequently undergo alterations. Therefore, it is believed that the need for artificially increasing immunity or maintaining it at its current level will constantly increase in the long run. This can only be achieved by frequent vaccination. It is not unlikely that vaccination will remain as the sole and last possibility of effectively controlling various forms of virus disease in pigs.
首先，总体讨论了控制猪病毒病的可能方法。控制方法的选择将由多种因素决定，如动物群体的生态和地理环境、致病病毒本身的流行病学行为以及经济和政治因素。这些方法包括彻底使猪群摆脱和/或保持其免受特定病毒感染、使特定病毒处于地方流行状态、在猪群中促进这种地方流行状态、进行疫苗接种，最后是将上述程序结合起来。随着养猪场规模越来越大的趋势，动物群体的天然或特异性免疫力与各种病毒之间的平衡常常被打破，从而有利于病毒。感染压力将过度增加，相关病毒的流行病学行为也常常会发生改变。因此，从长远来看，人们认为人为增强免疫力或将其维持在当前水平的需求将不断增加。这只能通过频繁接种疫苗来实现。疫苗接种很有可能仍然是有效控制猪各种形式病毒病的唯一也是最后的手段。
