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Each week a new question about swine with the possibility of answering questions from previous weeks.

What does a positive ELISA test result for PRRS tells us?

It only allows us to determine if an animal has been previously exposed to the PRRS virus.
Looking at the resulting S/P value we can tell if the infection is from a field virus from a vaccine.
Looking at the resulting S/P value we can quantify the animal's level of protection.

See a clue in the article ¿Can the level of protection against PRRS be measured?

Antibodies measured by the ELISA test are not correlated with protection and only allow us to conclude if an animal has had previous exposure to PRRSV. It cannot be distinguished if those antibodies are directed against field virus or modified live virus from a vaccine. These tests also do not allow the differentiation between maternally derived antibodies and antibodies actively produced by a piglet.

Questions

06-Nov-2019 Animal plasma, as an feed ingredient, is particularly rich in which amino acids? 40% correct

30-Oct-2019 How is affecting the rotation of semen doses during on farm conservation to its quality? 55% correct

23-Oct-2019 The United States inventory of all hogs and pigs on September 1, 2019. 35% correct

16-Oct-2019 Do the needs of amino acids increase during inflammatory processes? 41% correct

Random questions

14-Oct-2020 Which agent is involved in most of the co-infections found in the lungs of pigs diagnosed with PRDC? 31% correct

15-Dec-2021 How has Colombia's pork production evolved over the last decade? 50% correct

14-Feb-2012 After 12 hours, the IgG's in the colostrum are reduced by: 44% correct

31-Dec-2012 Since the first description of the PCV2 in 1998, the presence of this virus has been demonstrated in: 36% correct

Easy questions

10-Aug-2022 Which of the following can act as a reservoir for African swine fever virus? 78% correct

20-Nov-2024 What is the correct order of steps in a farm succession plan? 73% correct

09-Dec-2020 Is there any advantage for newly weaned piglets to have more trough space? 75% correct

13-Oct-2021 Which method is most commonly used in slaughterhouses to detect and classify boar taint in carcasses of entire male pigs? 71% correct

Difficult questions

07-Jan-2015 Why is the piglet's FCR almost 1 shorty after weaning? 28% correct

12-Nov-2013 Toxigenic Pasteurella multocida 29% correct

08-Apr-2014 The dorso-caudally located pleuritis... 28% correct

11-Mar-2026 How did China's pork production evolve in 2025? 29% correct