Changes

==Treatment and Control==

==Treatment and Control==

There is currently no known effective treatment for PRRS. Non-steoidal anti-inflammatory drugs have been used in an attempt to reduce fever, and appetite stimulants to counteract inappetance and poor weight gain. However, these appear to have minimal benefit. Antibiotics may be used to counteract secondary bacterial infections.

There is currently no known effective treatment for PRRS. Non-steoidal anti-inflammatory drugs have been used in an attempt to reduce fever, and appetite stimulants to counteract inappetance and poor weight gain. However, these appear to have minimal benefit. Antibiotics may be used to counteract secondary bacterial infections. As treatment for PRRS is ineffective, prevention is very important. Successful control of the disease is difficult, because of virus variation, large swine populations, and unresolved issues of transmission. In some smaller herds, immunity may be sufficient so that infection is not causing significant economic losses, in which case no intervention is necessary. Often, there are sufficient losses to consider some or all of the following points for control. A control program should be tailored to fit the individual farm situation. In herds where PRRS is not present, bought-in stock and semen should be PRRS-free, and any animals joining the herd should be quarantined on-site before being introduced to the cohort. Pigs should be tested on arrival to the unit, and again 45-60 days later before they join the main herd. In herds where PRRS is endemic, breeding gilts may be exposed to adult sows before they become pregnant in order to induce immunity. Existing infection can also be eliminated by multisite production and segregated early weaning, but the long-term risk of reinfection is high. Complete depopulation, disinfection and repopulation can also be successful, as can test-and-removal strategies.

 

As treatment for PRRS is ineffective, prevention is very important. In herds where PRRS is not present, bought-in stock and semen should be PRRS-free, and any animals joining the herd should be quarantined on-site before being introduced to the cohort. Pigs should be tested on arrival to the unit, and again 45-60 days later before they join the main herd. In herds where PRRS is endemic, breeding gilts may be exposed to adult sows before they become pregnant in order to induce immunity. Existing infection can also be eliminated by multisite production and segregated early weaning, but the long-term risk of reinfection is high. Complete depopulation, disinfection and repopulation can also be successful, as can test-and-removal strategies.  

Both modified live and killed vaccines are available. These are effective in controlling outbreaks and preventing economic losses.

Both modified live and killed vaccines are available. These are effective in controlling outbreaks and preventing economic losses.