Comparative between-laboratory trials of the liquid-phase blocking sandwich ELISA for the detection of antibodies to foot-and-mouth disease virus.

Fifty bovine serum samples were tested for the presence or amounts of antibodies to foot-and-mouth disease (FMD) virus serotypes A, O and C by the liquid-phase blocking sandwich ELISA (lpb-ELISA) using reagents prepared by the World Reference Laboratory for Foot-and-Mouth Disease (WRL) in Pirbright, U.K. Twenty of the sera had been collected before extensive vaccination with a commercial inactivated trivalent FMD vaccine was ceased and the remaining thirty originated from animals which had not been vaccinated for more than one year.

[Long-term exposure to PCB in broiler chickens--metabolic and immunotoxic effects].

Even though it has been forbidden to produce and commerically use polychlorinated biphenyls (PCB) in this country, their stocks and contaminated refuses continue to be a source of danger at present. Hence prevention of environment and food chain contamination is being focused on, along with their monitoring in various commodities. In the poultry operations random contacts of poultry with PCB-containing materials may be expected (paints, plasters, litter).