Aureomix S provides effective replacement for Mecadox
An interview with
Thomas Painter, DVM
Senior Technical Service Veterinarian
Q: The pork industry is expecting a shortage of Mecadox® (carbadox) that could last well into 2019. Should veterinarians and producers consider using Aureomix® S (chlortetracycline and sulfamethazine) as a replacement product?
TP: Absolutely. The indications for both products are similar. Aureomix S is also an easy product to manage.
Q: How does the label for Aureomix S diﬀer from the Mecadox label?
TP: Aureomix S is indicated not only for treatment of bacterial swine enteritis but also for preventing this type of enteritis during times of stress (Figure 1). That provides veterinarians with some ﬂexibility when recommending the medications because pigs can be stressed by a lot of circumstances — most notably, weaning. Other stressors are weather changes, commingling or sorting pigs. The indication for prevention is particularly important because bacterial enteritis is a common problem that has clearly been linked to stress.1
Q: Do the required withdrawal periods before processing diﬀer?
TP: The withdrawal time for both 12Aureomix S 10/10, a Type B Medicated Article, and Aureomix S 40/40, a Type A Medicated Article, is 15 days. Compare that to 42 days for Mecadox. That’s a 27-day diﬀerence — nearly 4 weeks. That also translates to more ﬂexibility for pork producers.
Q: Is a veterinary feed directive (VFD) required to use Aureomix S?
TP: Yes, but that’s not an obstacle. Swine veterinarians and the pork industry recognize the importance of increased veterinary supervision and have already adapted well to the new VFD regulations.
Q: What about the Aureomix S indication for maintaining weight gain in pigs with atrophic rhinitis. Is that too narrow an indication?
TP: Not really. Atrophic rhinitis isn’t as common as it once was, but we often see Pasteurella multocida and Bordetella, which cause atrophic rhinitis. If a herd had an outbreak of respiratory disease and I knew one of those pathogens was involved, I wouldn’t hesitate to issue a VFD for Aureomix S. I would consider that a responsible use of antibiotics when prescribed in the context of a veterinarian-client-patient relationship.
Q: Do feed mills need to make changes before switching to Aureomix S?
TP: No. The same standard operating procedures for sequencing and ﬂushing that are used for Mecadox should be followed to comply with FDA guidelines.
Q: Should feed mills be concerned about sulfa spikes in ﬂush feeds?
TP: That’s not a big concern with Aureomix S because it’s an all-granular formulation. Years ago, the pork industry experienced some problems with sulfa spikes with products that weren’t granulated. Fecal contamination of pigs with sulfas was also a concern when more pigs were on dirt or concrete, but now most commercial pigs are on slatted ﬂoors, so it’s seldom a problem.
Q: Are there any other reasons to use Aureomix S?
TP: The granular formulation of Aureomix S distributes really well in feed. It’s not dusty, and there’s good stability under high temperatures.
Caution: Federal law restricts medicated feed containing this veterinary feed directive (VFD) drug to use by or on the order of a licensed veterinarian.
Withdraw Aureomix fifteen (15) days prior to slaughter.
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Mecadox is a registered trademark of Phibro Animal Health.
1 McLamb B, et al. Early Weaning Stress in Pigs Impairs Innate Mucosal Immune Responses to Enterotoxigenic E. coli Challenge and Exacerbates Intestinal Injury and Clinical Disease. PLoS One. 2013 Apr 24. https://www.ncbi.nlm.nih.gov/pmc/ articles/PMC3634819/
Posted on May 13, 2019