A adult cow in a Brazilian cattle farm in Pará has tested positive for atypical mad cow disease, and the definitive results of the second test, sent to Canada for analysis, will be announced on Thursday. This has led to Paraguayan refrigeration companies halting the purchase of animals for slaughter until more information is available. If the results are confirmed, China, the world's largest meat importer, may temporarily stop importing meat from Brazil for up to four weeks. This could potentially increase the burden on common markets, including Paraguay and Brazil's domestic market, and provide an opportunity for Uruguay and Argentina to increase their exports to China.